Anyone with a JL 300/4, I need your help. I am going to call JL tomorrow to try and get an answer on this but, could it be that in the optimim configuration charts, that the Stereo pair is adding the 2 speakers together? What I mean is, I have the Boston Pro's which are 3 ohm, maybe with the 3 ohm and 3 ohm, it is 1.5 ohms Stereo and the bridged rear would be 3 ohm bridged. That would make sense. Otherwise, the 300/4 is a not a good choice at all for a 3 channel amp and not very flexible. To get maximum power, your front load has to be half of the rear. Even if you had 4 ohm components and a 4 ohm sub, according to the charts, the sub would see 150 and the components 37.5 x 2. Unless my theory above is correct. Let me know what you think.

 

hey acurax2 you are planning on running your system in a tri mode config correct... that would mean you have the bostons using the front channle of the amp and then bridge the rear channle for a sub... if so then you should get 75w to each component and 150w to the sub... but i do see what you mean on the optimum config chart... hum it looks like to get optimum performance with the front channle stereo and the rear channle bridged that the bridged channle load has to be double that of the front channle... hummmmmm... i would call jl and speak to them...

on a side note.. what subs are you planning on running...

 

Shawhite.....so you do see what I mean. It does not make any sense to me either. Most people are going to have 4 ohm components and a single 4 ohm sub. And according to the chart, you are screwed if you want to use the 300/4.


I have a single 10W6 in a JL Stealthbox.

 

hey what i dont get is why are you wanting to bridge the sub to the rear channel of the 300/4 when you have a 500/1. the 300/4 is a 4 channel amp why are you wanting to make it a 3 channel amp.

 

i believe he is limited on space... the setup you see is what he has in his car i believe this setup he is refereing to is in another vehicle...

 

Shawhite is exactly right. I have a 300/4 and 500/1 in my TL. I have another 300/4 and a 250/1 that I had in my previous install. There is not room in my current install for 2 amps without loosing cargo space that I can not loose. This is in a Honda CRV.

I will post on what JL says tomorrow.

 

I thought u had to have a 8ohm woofer bridged. So the front channels produce 75x2. Hey I might be wrong.

 

According to the charts, the front channels in stereo have to be half the impendence of the rear bridged channel. To me, this makes zero since. If that is the way it is, it will not work. The best I could do is 75 x 2 to the front, then run the sub off one rear channel and it would get 75. If this is indeed the way the amp works, I will be switching amps. Already made a deal to get rid of one of them and thought if I could get it to work, I would take the one out of the TL and use. Then, just get something else for the TL.

 

Why dont u just install the bostons and bridged the rear 2 channels to the sub. Is the W6 a Dual 4 . The half imp made no sence to me either but aftre reading it for awhile it kicked in. When u have 2 channels running at 4 ohm stereo and the other 2 bridged at 4ohm thats just like running the 2 stereo channles at 2ohms each.

So thats why I earlier said make sure u get a dual 4 or a 8 ohm woofer. I think the JL 300/4 is on of the best amps on the market. I say switch out the W6 if its not a dual 4. If it is than thats fine. try for a w3 or even a 8 ohm W0 should do the trick with that much power. Again goodluck X2

 

The JL is a dual 6 ohm sub running at 3 ohms. The Bostons are 3 ohm components. I hope you are correct in thinking that the two 3 ohm speakers make a 1.5 ohm stereo load. That is what I think it might mean but, will see.

 

Well, I just got off the phone with JL Tech Support and if I understood correctly, the amp will indeed put out full power. IE, 75 x 2 and 150 x 1, unless the amp clips. The RIPS system has a built in feature that if the amp clips rather than cause damage, it will reduce power to the highest load. Therefore, if the amp clipped, it would reduce the power to the Boston's from 75 watts down to the 37.5. They said it is more of a protection feature.

 

OK you are thinking correctly the boston will run at 3ohm and the amp will think the W6 will be at 1.5ohm

 

hey acurax2 that sounds more reasonable... personally if i was just i would just give it a wirl and see what happens...

 

In looking for other amps, there is nothing that I have found that fits the bill. I found a couple of amps that would fit in the space but, they will not do 3 ohms bridged. I may try and go with a couple of small amps and relocate the Alpine brain. Where I do not know but, I may not have a choice. Thanks for all the input.