JayVee's 3G TL
#1041
Update short and sweet...
went to LIVE WIRE CAR AUDIO Warehouse and purchased black speaker box carpet, adhesive and 1x 12in speaker ring.
Went home to get some work done after details were cleared up by Jerry...even if he did not remember anything with his build since it was over a year and a half...LOL! But he really did help with what he did tell me
Weather sucks here...Its SUMMER! Means, thunder storms every day 3-5pm just about![Frown](https://acurazine.com/forums/images/smilies/frown.gif)
I did get to cut the speaker hole out & trim the corners to have a staggered fit to the 2nd layer. I mended together the 2 sheets with Gorilla Glue and now it is being clamped to dry over night.
Tomorrow, more to come with pics
Hopefully...
went to LIVE WIRE CAR AUDIO Warehouse and purchased black speaker box carpet, adhesive and 1x 12in speaker ring.
Went home to get some work done after details were cleared up by Jerry...even if he did not remember anything with his build since it was over a year and a half...LOL! But he really did help with what he did tell me
![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
Weather sucks here...Its SUMMER! Means, thunder storms every day 3-5pm just about
![Frown](https://acurazine.com/forums/images/smilies/frown.gif)
I did get to cut the speaker hole out & trim the corners to have a staggered fit to the 2nd layer. I mended together the 2 sheets with Gorilla Glue and now it is being clamped to dry over night.
Tomorrow, more to come with pics
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
#1043
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Josh, that thing looks really heavy. How much does it weigh?
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JayVee (07-10-2012)
#1044
Pics make it look very ENLARGED...But it only sits maybe 3ft across, 2ft high and 1.5in thick weighing in under 20lbs. Not bad at all. Remember, still less then a full enclosed box
and WAY less space. Plus, its been advised one of the most important things or issues to the IB is, flexing. So, I decided to go with Jerry's advice and double up on the baffle and even add a smaller section 3rd sheet around the sub as a last added support. 3rd sheet will only be approx. 15in sq. Added to surround the sub acting as a brace to the suspension and vibration to the immediate area (sub).
Shouldn't be bad at all, you will see
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
Shouldn't be bad at all, you will see
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
Last edited by JayVee; 07-10-2012 at 09:01 PM.
#1045
OK...so here is my new 3 sheets of canvas
Trial and error I have learned my mistake in inturpreting Jerry's build and design wrong. All is being corrected now and I will show you guys were I went wrong...so u don't make the same mistake(s) as I did.
As you can see from my first rendition I cut BOTH panels the same size. Jerry explained to me the importance of 2 things regarding this build, SEAL EVERYTHING and SUPPORT FROM FLEX. Well, supporting in total with 3 layers, the second layer is to mount and hold the sub. With it cut the same diameter as the sub, that would not work which will leave the 3 panel alone supporting the vibration and suspension of the sub.
Example:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture179.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture180.jpg)
Would this still work...Hell YES! But I am just so pickey regarding detail and the desire to do it like the PRO's, I must make the change or else this will bother me for years to come... Really, it will...
So, here is it starting again and doing it the JERRY WAY! = The RIGHT way IMO
Is there any other way???
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture185.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture186-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture187-1.jpg)
...in addition, there are some small changes. Notice the top edge of the front panel is a lil higher by approx 1in or so. Also, the bottom corners of the panel shaped so the bottom corners will fit more snug in the natural curve of the floor. Last design I did make a slight cut (see previous pages) on the bottom and this time I will attempt to fill in the gaps a lil more helping with sealing and allowing the panel to do so with added deadening later in the install.
Hopefully now, we will be cooking with grease in this build!
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
As you can see from my first rendition I cut BOTH panels the same size. Jerry explained to me the importance of 2 things regarding this build, SEAL EVERYTHING and SUPPORT FROM FLEX. Well, supporting in total with 3 layers, the second layer is to mount and hold the sub. With it cut the same diameter as the sub, that would not work which will leave the 3 panel alone supporting the vibration and suspension of the sub.
Example:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture179.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture180.jpg)
Would this still work...Hell YES! But I am just so pickey regarding detail and the desire to do it like the PRO's, I must make the change or else this will bother me for years to come... Really, it will...
So, here is it starting again and doing it the JERRY WAY! = The RIGHT way IMO
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture185.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture186-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture187-1.jpg)
...in addition, there are some small changes. Notice the top edge of the front panel is a lil higher by approx 1in or so. Also, the bottom corners of the panel shaped so the bottom corners will fit more snug in the natural curve of the floor. Last design I did make a slight cut (see previous pages) on the bottom and this time I will attempt to fill in the gaps a lil more helping with sealing and allowing the panel to do so with added deadening later in the install.
Hopefully now, we will be cooking with grease in this build!
![Big Grin](https://acurazine.com/forums/images/smilies/biggrin.gif)
#1046
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shit, tooo much work
![Tongue](https://acurazine.com/forums/images/smilies/tongue.gif)
#1048
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HELL YEAH !!!
mods are always a lot more satisfying when you have put the elbow grease in it....and you are doing this mod amazingly well....there is no reason why it wont sound as you want it to sound
mods are always a lot more satisfying when you have put the elbow grease in it....and you are doing this mod amazingly well....there is no reason why it wont sound as you want it to sound
![Thumbs Up](https://acurazine.com/forums/images/smilies/thumbsup.gif)
The following users liked this post:
JayVee (07-12-2012)
#1049
OK, so here it is... I just spoke to Ron A by PM and he advised me I am able to list or bring up possible takers or anyone who is interested in the exact copies/templates for a INFINITE BAFFLE install. I will send you BOTH panel sizes. 1.) front panel/fascia 2.) back supporting panel. The 2nd panel you will need (recommended) to make 2 for better support as seen in my build and Jerry's/niebur3. I also will leave the speaker hole for you to place and cut out for yourself so this can be left open for different size subs of your choice. (8in, 10in, 12in, 15in...)
Getting these templates will eliminate HOURS of fitting, trimming, fitting, trimming... and fit just as my build shows. Any one who may be interested, pls PM me for details. Or call or text msg #813-841-5563 Josh/ JayVee
Thanks
Getting these templates will eliminate HOURS of fitting, trimming, fitting, trimming... and fit just as my build shows. Any one who may be interested, pls PM me for details. Or call or text msg #813-841-5563 Josh/ JayVee
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
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swoosh (07-12-2012)
#1051
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^^^ shhhh
![Snicker](https://acurazine.com/forums/images/smilies/emot-laugh.gif)
#1053
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^^^ who said i was antagonizing Dennis... ![Ninja](https://acurazine.com/forums/images/smilies/ninja.gif)
am in a (good) goofy mood today so, dont mind me
![Ninja](https://acurazine.com/forums/images/smilies/ninja.gif)
am in a (good) goofy mood today so, dont mind me
![Big Grin](https://acurazine.com/forums/images/smilies/biggrin.gif)
![Teef](https://acurazine.com/forums/images/smilies/teef.gif)
#1055
Here it is. The NEW baffle with the preliminary trimming starting with the bottom floor board arch to help seal naturally from design.
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffleIV.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffle.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffleII.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffletrunk.jpg)
The downward shaped corners will help with a snug fit and just adding deadening.
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffleIV.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffle.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffleII.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffletrunk.jpg)
The downward shaped corners will help with a snug fit and just adding deadening.
Last edited by JayVee; 07-12-2012 at 05:12 PM.
#1057
Thanks dude, u and me both, Pssssshh, lots of wk slow process
Yo, TAMPA? Is this homeboy? I forget your name, sorry...The one I see at the shop? Can't tell with your avatar since I know u have TLS waffles and not stars. Unless I have the wrong person.
![Frown](https://acurazine.com/forums/images/smilies/frown.gif)
#1058
-Brandon
![rofl](https://acurazine.com/forums/images/smilies/rofl.gif)
![Tomato](https://acurazine.com/forums/images/smilies/tomato.gif)
I'm in Tampa but I'm bone stock so I can't be the one your talking about but I do know someone on AZ that's up in the 813 that is riding on waffles and is blue. I think they were at the Tampa meet back in March.
#1061
You did... thats when i told u i was talking to the wife about it last night when i was tracing the new baffles. So i pm'd Ron asking how could i do that? And the red content is whsn i heard back from him. After u brought up the idea and i said get outta my head...lol
#1062
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Josh, I think you're just holding out on finishing the job so you can have the longest thread in the Photo Section!
#1072
OK...Here they are in their final raw form. TEMPLATES ARE FINISHED AND FIT PERFECT!!! I will be tracing the 2 panels on enlarged paper FOR SALE $25.00 + PayPal Fee / SHIPPED / Mailed.
Here they are ~
*Remember, here they are (NEWEST DESIGN) freshly cut from the 2x4x 3/4 sheet of MDF Before all the final trim to fit was done*
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture183.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture186-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture187-1.jpg)
Now here they are trimmed and fitted into the TL. ***REMINDER*** This design is ONLY for the 3G TL.
Here is how I started today:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffleII.jpg)
And this was the progress made till finished:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture189.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture193-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture190-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture191.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture192.jpg)
The dark marked area is where the HARDWARE will be mounted. I first marked a spot then changed the location later to spread them as equal as possible on baffle for each side where I saw fit:
These are the mocked spots. On your templates you can mount your hardware where u see fit.
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture198.jpg)
After final cut, I saw the sub needed to be moved down for equal spacing & strength against any possible flexing. See top very small body/spacing of wood panel.
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture199.jpg)
From the trunk:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffletrunk.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture196.jpg)
From the trunk with mocked 2nd panel. NOTE: 3rd panel will be identical so no need showing fitment or mock.
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture200.jpg)
FINAL PRODUCT:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture201-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture202.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture203.jpg)
NOTE: There is one thing I will not be able to mock or trace on template and will be needed to be done for flush fitment and braces to be installed. VERY EASY! Either sand or jig saw cut a shaved piece from the indicated corners to clear the metal suspension wells/tubs as shown:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture192.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture204.jpg)
Hope you guys enjoy this build as much as I am in learning and molding my progress. Any inq/interested members wanting the TEMPLATES of this design PM me or call/text #813-841-5563 Thanks!
...PM from today have been returned and 3 pending purchases
Here they are ~
*Remember, here they are (NEWEST DESIGN) freshly cut from the 2x4x 3/4 sheet of MDF Before all the final trim to fit was done*
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture183.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture186-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture187-1.jpg)
Now here they are trimmed and fitted into the TL. ***REMINDER*** This design is ONLY for the 3G TL.
Here is how I started today:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffleII.jpg)
And this was the progress made till finished:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture189.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture193-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture190-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture191.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture192.jpg)
The dark marked area is where the HARDWARE will be mounted. I first marked a spot then changed the location later to spread them as equal as possible on baffle for each side where I saw fit:
These are the mocked spots. On your templates you can mount your hardware where u see fit.
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture198.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture197.jpg)
After final cut, I saw the sub needed to be moved down for equal spacing & strength against any possible flexing. See top very small body/spacing of wood panel.
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture199.jpg)
From the trunk:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/NEWbaffletrunk.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture196.jpg)
From the trunk with mocked 2nd panel. NOTE: 3rd panel will be identical so no need showing fitment or mock.
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture200.jpg)
FINAL PRODUCT:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture201-1.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture202.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture203.jpg)
NOTE: There is one thing I will not be able to mock or trace on template and will be needed to be done for flush fitment and braces to be installed. VERY EASY! Either sand or jig saw cut a shaved piece from the indicated corners to clear the metal suspension wells/tubs as shown:
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture192.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/Picture204.jpg)
Hope you guys enjoy this build as much as I am in learning and molding my progress. Any inq/interested members wanting the TEMPLATES of this design PM me or call/text #813-841-5563 Thanks!
...PM from today have been returned and 3 pending purchases
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
#1073
Gorilla Glue and sandwiched the 2 rear supporting panels
![](http://i158.photobucket.com/albums/t119/1str8SRT8/DSC05685.jpg)
This should work with clamping them together tightly overnight
LOL! I don't have FANCY vice clamps like the PROS! (...*cough cough* JERRY!) ![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/DSC05686.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/DSC05687.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/DSC05688.jpg)
MORE TO COME TOMORROW & TEMPLATES TO BE CONVERTED ON PAPER TOMORROW FOR AVAILABILITY
![](http://i158.photobucket.com/albums/t119/1str8SRT8/DSC05685.jpg)
This should work with clamping them together tightly overnight
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/DSC05686.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/DSC05687.jpg)
![](http://i158.photobucket.com/albums/t119/1str8SRT8/DSC05688.jpg)
MORE TO COME TOMORROW & TEMPLATES TO BE CONVERTED ON PAPER TOMORROW FOR AVAILABILITY
![Wink](https://acurazine.com/forums/images/smilies/wink.gif)
Last edited by JayVee; 07-13-2012 at 09:07 PM.
#1075
SERIOUS UPDATE:
After further research and find by audio Guru's alike...(definitely NOT me) and hrs of talking and texting Jerry, my IB build has come to a screeching hault, abrrupt stop, crash and burn, epic FAIL, good wood for smores and a friendly camp fire. My IB build is DEAD! Its been advised due to the specs and perimeters of my IDQ12 V3 the over all optimal performance will be met in a small 1 cubic ft enclosed box... Yes, its true. Does this mean the IB is a waste or does NOT sound good? HELL NO! Just ask IHC! It sounds every bit of good and some of the BEST musical tones ever heard... ***WITH THE RIGHT SUB*** And here is a article posted by Jerry explaining in full ...(sounds like Chinese to me) detail. My perimeters just don't meet the usage for a IB set up.
BUT!!! I still have the TEMPLATES for those who want to run with a IB set up and has the woofer(s) to back it up. Contact me![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
Here is some good reading regarding a Critically Damped Vs Underdamped Vs Overdamped. Again, I think the driver still needs to be selected carefully for IB installation.
"Damping & Q
Before we define Q, let’s think about a car again. All automobiles have a suspension which prevents bumps and dips in the road from jarring the passengers. However, a car cannot use a spring suspension by itself because the car would continue to bounce (resonate) after each bump or dip. The bouncing needs to be suppressed and this is what the shock absorbers or dampers do. They suppress the unwanted bouncing after the springs have absorbed the initial impact of the bump or dip. In similar fashion, a speaker driver needs to be damped. Otherwise, its diaphragm will tend to vibrate excessively at its resonance frequency.
Several things serve to damp the driver. These include the suspension (surround and spider), motor (voice coil and magnet circuit) and amplifier output resistance. Achieving an optimal amount of damping can sometimes be a challenge and it almost always requires a consideration of the type of box in which the driver will be used. If the driver is not designed properly, it may be underdamped or overdamped. An underdamped driver will have ripples in its response and it will reproduce transient signals poorly. An overdamped driver will have a reduced low-frequency response.
"Q" is the term used by speaker designers and engineers to describe how well damped a driver is. However, Q is not damping. Instead, it is resonance magnification which is the exact opposite of damping. So a higher amount of damping results in a lower value of Q and visa versa. Let’s return to our earlier graph:
The driver which was used to create this graph has a total Q (Qts) that is super low at only 0.19. This low Q value results primarily from an extremely strong magnet and this driver by itself would be considered severely overdamped. To get a maximally flat response out of it we had to counteract some of the damping by stiffening the overall compliance. We did this by putting the driver in a relatively small box having an air volume with a much smaller compliance than the driver suspension. This caused the overall compliance to decrease considerably and the total Q (Qtc) to increase to 0.7 as shown in the green curve in the graph. A Q of 0.7 is considered by many to be the ideal value because it balances driver damping with a smooth low-frequency response and a reasonably good transient response.
The red curve was created with a huge box whose volume was over 100 times larger than the maximally flat box. As a result, the box has a very high compliance and so it could not stiffen the compliance of the driver much at all. In fact, the total Q was 0.2 which is just slightly greater than the driver, itself. Because the total Q is allowed to remain so low, the design is considered overdamped. Notice how it produces less low-frequency amplitude between 95 and 400 Hz. You might consider its greater output below 95 Hz to be an advantage but this is probably not the case because the driver would have to move a tremendous amount of air at these low frequencies and its maximum excursion (Xmax) may not be large enough to handle this. If it is not, it will at best have higher distortion and at worst become damaged.
The blue curve was created with an ultra small box whose volume was over 25 times smaller than the maximally flat box. As a result, the box has a very low compliance and so it stiffened the compliance of the driver by a very large amount. In fact, the total Q was 3.0 which is quite high and causes the box to be underdamped. Notice how it produces a 9 dB response peak that is centered at 580 Hz. The peak occurs at this frequency because the low compliance of the box has in effect shortened the spring, raising the resonance to 580 Hz. The peak is 9 dB high because the driver lacks sufficient damping to overcome its resonance. This means that the driver will ring like a bell at 580 Hz. Needless to say, it will also have poor transient response at this frequency.
Note: The compliance of the driver and box are in series with each other but they sum in parallel like capacitors so the sum is always less than the lowest of the driver or box compliance values. In other words, the lowest compliance dominates the system. With the red curve, the box had a compliance that was much higher than the driver and so the driver’s compliance was dominant. Therefore the total compliance was not influenced much by the box. However, the box of the blue curve had a compliance that was much lower than the driver, and being the lower value it became the dominant one and caused the total compliance to appear to be much lower."
This was an exert found here:http://www.ht-audio.com/pages/SpeakerBasics.html
__________________
More can be found here: (pg12 of thread)
https://acurazine.com/forums/showthr...643925&page=12
After further research and find by audio Guru's alike...(definitely NOT me) and hrs of talking and texting Jerry, my IB build has come to a screeching hault, abrrupt stop, crash and burn, epic FAIL, good wood for smores and a friendly camp fire. My IB build is DEAD! Its been advised due to the specs and perimeters of my IDQ12 V3 the over all optimal performance will be met in a small 1 cubic ft enclosed box... Yes, its true. Does this mean the IB is a waste or does NOT sound good? HELL NO! Just ask IHC! It sounds every bit of good and some of the BEST musical tones ever heard... ***WITH THE RIGHT SUB*** And here is a article posted by Jerry explaining in full ...(sounds like Chinese to me) detail. My perimeters just don't meet the usage for a IB set up.
BUT!!! I still have the TEMPLATES for those who want to run with a IB set up and has the woofer(s) to back it up. Contact me
![Smile](https://acurazine.com/forums/images/smilies/smile.gif)
Here is some good reading regarding a Critically Damped Vs Underdamped Vs Overdamped. Again, I think the driver still needs to be selected carefully for IB installation.
"Damping & Q
Before we define Q, let’s think about a car again. All automobiles have a suspension which prevents bumps and dips in the road from jarring the passengers. However, a car cannot use a spring suspension by itself because the car would continue to bounce (resonate) after each bump or dip. The bouncing needs to be suppressed and this is what the shock absorbers or dampers do. They suppress the unwanted bouncing after the springs have absorbed the initial impact of the bump or dip. In similar fashion, a speaker driver needs to be damped. Otherwise, its diaphragm will tend to vibrate excessively at its resonance frequency.
Several things serve to damp the driver. These include the suspension (surround and spider), motor (voice coil and magnet circuit) and amplifier output resistance. Achieving an optimal amount of damping can sometimes be a challenge and it almost always requires a consideration of the type of box in which the driver will be used. If the driver is not designed properly, it may be underdamped or overdamped. An underdamped driver will have ripples in its response and it will reproduce transient signals poorly. An overdamped driver will have a reduced low-frequency response.
"Q" is the term used by speaker designers and engineers to describe how well damped a driver is. However, Q is not damping. Instead, it is resonance magnification which is the exact opposite of damping. So a higher amount of damping results in a lower value of Q and visa versa. Let’s return to our earlier graph:
The driver which was used to create this graph has a total Q (Qts) that is super low at only 0.19. This low Q value results primarily from an extremely strong magnet and this driver by itself would be considered severely overdamped. To get a maximally flat response out of it we had to counteract some of the damping by stiffening the overall compliance. We did this by putting the driver in a relatively small box having an air volume with a much smaller compliance than the driver suspension. This caused the overall compliance to decrease considerably and the total Q (Qtc) to increase to 0.7 as shown in the green curve in the graph. A Q of 0.7 is considered by many to be the ideal value because it balances driver damping with a smooth low-frequency response and a reasonably good transient response.
The red curve was created with a huge box whose volume was over 100 times larger than the maximally flat box. As a result, the box has a very high compliance and so it could not stiffen the compliance of the driver much at all. In fact, the total Q was 0.2 which is just slightly greater than the driver, itself. Because the total Q is allowed to remain so low, the design is considered overdamped. Notice how it produces less low-frequency amplitude between 95 and 400 Hz. You might consider its greater output below 95 Hz to be an advantage but this is probably not the case because the driver would have to move a tremendous amount of air at these low frequencies and its maximum excursion (Xmax) may not be large enough to handle this. If it is not, it will at best have higher distortion and at worst become damaged.
The blue curve was created with an ultra small box whose volume was over 25 times smaller than the maximally flat box. As a result, the box has a very low compliance and so it stiffened the compliance of the driver by a very large amount. In fact, the total Q was 3.0 which is quite high and causes the box to be underdamped. Notice how it produces a 9 dB response peak that is centered at 580 Hz. The peak occurs at this frequency because the low compliance of the box has in effect shortened the spring, raising the resonance to 580 Hz. The peak is 9 dB high because the driver lacks sufficient damping to overcome its resonance. This means that the driver will ring like a bell at 580 Hz. Needless to say, it will also have poor transient response at this frequency.
Note: The compliance of the driver and box are in series with each other but they sum in parallel like capacitors so the sum is always less than the lowest of the driver or box compliance values. In other words, the lowest compliance dominates the system. With the red curve, the box had a compliance that was much higher than the driver and so the driver’s compliance was dominant. Therefore the total compliance was not influenced much by the box. However, the box of the blue curve had a compliance that was much lower than the driver, and being the lower value it became the dominant one and caused the total compliance to appear to be much lower."
This was an exert found here:http://www.ht-audio.com/pages/SpeakerBasics.html
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More can be found here: (pg12 of thread)
https://acurazine.com/forums/showthr...643925&page=12
#1076
Racer
iTrader: (2)
Damn, I caught up on 4 pages of reading to see the finished product for not.
It was still a good read.
Any updates on the new wheels?
Also, how's the back?
I have back problems so I know what you mean about pain!
I even bought one of those tilting tables to help stretch it out.
It was still a good read.
Any updates on the new wheels?
Also, how's the back?
I have back problems so I know what you mean about pain!
I even bought one of those tilting tables to help stretch it out.
Last edited by pinina; 07-15-2012 at 07:25 AM.
#1077
Damn, I caught up on 4 pages of reading to see the finished product for not.
It was still a good read.
Any updates on the new wheels?
Also, how's the back?
I have back problems so I know what you mean about pain!
I even bought one of those tilting tables to help stretch it out.
It was still a good read.
Any updates on the new wheels?
Also, how's the back?
I have back problems so I know what you mean about pain!
I even bought one of those tilting tables to help stretch it out.
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#1078
Team Owner
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Join Date: Jan 2008
Location: Kansas City, MO (Overland Park, KS)
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I hope your back is truly back buddy.
#1079
I hope so to
Like I said ^ I am working and doing duties round the house...But in a way, still backing off and NOT full throttle. I thing the biggest and tense duty I have done is the IB build. With lifting, bending, squatting, stretching...etc... But not HEAVY duty stuff but still working my body and back. Maybe I am scared to throw it out again
I may hit my routing workout within another week.
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