AdmiralBenson

Well, thanks to some good tips/advice from people on this forum, I've decided to make some changes to my system (which I installed last week!).

I had SoundStream tweeters in the dash (running off the Sony head), Infinity Reference coax in the front doors, Audiobahn AMDQ60 midbass in the rear doors (Infinity + Audiobahn running off RF Punch 800a.4), and had ordered an Image Dynamics ID8 v3 sub, and MTX 200w sub amp to round out the bass.
(Not overly impressive, but it's a budget system!)

I am ditching the Soundstream tweeters, and Audiobahn midbass (didn't like the sound of them anyhow), and just ordered a set of Focal Polyglass 6.5" components which will go in the front doors/dash. The Infinity coax will move to the rear doors for fill.

I was planning to run the Focals off the front channels of the RF amp, the Infinity coaxs off the head, and possibly the ID sub off the rear channels of the RF amp.

But....

The ID sub is dual 4ohm, so I can't bridge the amp (it's only stable to 4ohms bridged). I had thought I could split the RCAs for the front inputs, use a Y adapter to make the signal mono, then use another Y adapter to split that mono signal into the rear inputs on the amp, and then run each voice coil off one of those rear channels on the amp.

Is this a stupid idea that won't work?

Any other thoughts on how I could wire the system (I'd like to remove the MTX sub amp from the equation and sell it, and just use the RF amp)

Any thoughts appreciated - sorry for the length of the post!

Sassmaster

iTrader: (2)

won't work... run the coils of the sub in series, it'll show 8 ohms to the amp, and give you 4 ohms per channel. best you're gonna get out of that.

Milton

If I read your post correctly using just the rockford amp would be fine. Run the focals off of the front two channels and bridge the rear for the sub. Your amp should have pass-through outputs on it so run your cable from the head into the front and put a short set of cables from the pass-through into the rear inputs for the sub.

Runing the sub at 8 ohms mono on that amp should still give it slightly more than 200 watts rms, I think that is close to ids' specs and if you wanted you could always add a second sub.

If you haven't ordered yet you could just order the duel 2 ohm model but then again I'm not sure if the v3 is available in that configuration.

Good luck

AdmiralBenson

Thanks for the responses. [img]graemlins/thumb.gif[/img]

I understand what you're saying about bridging the rear channels of the RF amp, and wiring the sub coils in series to present an 8ohm load.

I'm still struggling to understand why, if I can feed the exact (i.e. mono) signal to each rear channel, I can't wire each channel to one of the sub's coils. I had thought that each voice coil would present a seperate 4ohm load to the amp, so if the signal is mono, I should be able to give 200w RMS to the sub.

Please correct this thought - I'd really like to understand why this won't work...


Thanks in advance!

Milton

I believe that that would work but it may not be as safe for the sub that way. If there is any difference in power supplied to either coil it could wreck the sub as far as I have heard.
Using the 800@4 with the rear channels bridged at 8 ohms you will be getting more than the 200 watts rms anyways. And you won't have to worry about any problems with the seperate channels powering each voicecoil.
I think that you need to remember that the specs for that amp say 2 x 200 watts rms at 8 ohms mono and 2 x 400 watts rms at 4 ohms mono.
Your sub will be getting more than 200 watts rms using it on the rear channels at 8 ohms mono.
I'm not really sure if that explained it any more for you or just confused the situation.

AdmiralBenson

Damn I'm a moron.

When I looked at the specs for the amp, I had it it my head that bridged output was 200Wx2, but of course you're right, Milton, it's 400wx2 into 4Ohms, and I'll get 200w RMS into the sub by bridging the rear channels, and wiring the VCs in series.

Thanks for making me see the light!