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Car Forum / Driving, Maintenance, Tuning / Car Audio / October 2006Help With Amp and speaker setup and subs
I have my jbl speakers all on a 4way amp. comming off a sony head unit in 4 different channels. How could i add a sub to the system. would i need a new amp also. if so where would i hook that to?or could i put all the jbl speakers on 2 channels from my amp now and then use the other 2 for the sub? what do you suggest? Thanxs Ryan you can do it either way. I'd suggest getting a separate amp for th sub, though, if you have the means you hook the second amp up the same way as the first amp. if the powe wire is large enough to support both amps, you can just get distribution block and split it towards both amps. If it's not o adequate size, you can either run another power wire for the new amp or replace the existing wire with one capable of handling both amps and doing the distro. block. If it were me, I'd choose the latter, bu either way is fine You'll want to ground to the same spot as the other amp If your head unit only has two RCA outputs, you'll have to us splitters on one set to get the signal to the other amp. Otherwis just run them as normal remote wire you can just daisy chain from the other amp's remot terminal -- KU40 Everything KU40 said was right on track. I wanted to add that YOU CAN use your existing four channel amp to drive everything as you had suggested (two channels drive the 4 JBL's and the other two drive the sub). The disadvantage of this is that you lose fader control, obviously (as all four speakers will now be driven by just two channels of amplification). This loss of fader control can sometimes be an issue. However, there are passive circuits (called L-pads) that can be inserted in your speaker line to lower the volume of a particular speaker. For instance, let's say you set this thing up using the one amp approach but you realize your rear-speakers sound WAY too loud. Well, you can't use your fader anymore to turn them down. But you can buy these low cost L-pads and insert them in the speaker path for both of the rear speakers to lower the volume a few dB. BTW, I used this approach on my VERY first system (nearly 20 years ago...geez!), and it worked fine. But, as KU40 said, it would probably be best to get the subwoofer it's own dedicated amplifier. If possible, look for Class D amps as they are more efficient (they take less power than other amps to make the same volume level). Unless you have a beefed up electrical system, a powerful Class AB (the most typical kind of amp) amp (let's say 500 watts) driving a powerful subwoofer/s will SEVERELY sap your car's electrical system. So efficiency is very important. Good luck!! MOSFET > you can do it either way. I'd suggest getting a separate amp for the > sub, though, if you have the means. [quoted text clipped - 15 lines] > remote wire you can just daisy chain from the other amp's remote > terminal. > If your head unit only has two RCA outputs, you'll have to use > splitters on one set to get the signal to the other amp. Otherwise > just run them as normal. Y-cables for RCA work fine too, but I think you'll have to crank up the gain on the amps a little. Don't y-cables result in a lower voltage signal going to each amp? I thought I noticed that some time in the distant past, but I can't remember for certain. If that's the case, it's something to think about if your current amp's gains are already set very high... A lot of amps have RCA line ins AND a set of RCA line outs, so you can daisy chain as many amps together as you want with only one set of RCA cables coming from the HU. My Kickers have this, although I'm not using them. It's basically a splitter built into the amp. Whatever you do, make sure you're splitting PRE-crossover. >> If your head unit only has two RCA outputs, you'll have to use >> splitters on one set to get the signal to the other amp. Otherwise [quoted text clipped - 6 lines] >it's something to think about if your current amp's gains are already >set very high... The outputs of units most always include series resistors. Any load at all will begin dropping the signal. greg > The outputs of units most always include series resistors. Any load at > all will begin dropping the signal. Do amps that have parallel line out's ever boost the output signal to make up for db loss, or is it really just another set of RCA jacks literally wired to the input, ie a y-cable? >> The outputs of units most always include series resistors. Any load at >> all will begin dropping the signal. > >Do amps that have parallel line out's ever boost the output signal to >make up for db loss, or is it really just another set of RCA jacks >literally wired to the input, ie a y-cable? Hardly ever done. Might be some that do. greg |
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