Join Date: Aug 2005
Location: Arlington Texas
Further elaborations on my older post....
The Infinity amps rely solely on low impedance speakers. They can deliver a good bit of current but they have very little voltage capability. Thus, to deliver lots of current with little voltage, the impedance must be very low. Also, each channel isn't all that potent, the power is spread over 6 or more channels. That's not what most people want for aftermarket speakers unless they're crazy like me and are going for a custom active crossover, tri-amp system.
In addition, the Infinity amp contains crossovers and equalization that is tailored for the Infinity speakers. It does not sound right or give much output with aftermarket speakers. You're better off with deck power!
What's interesting as hell is that the Midline amp puts out more power to 4 ohm speakers than the Infinity system will! The Midline amp is considerably more advanced form a power supply standpoint. In addition to lacking the pesky crossovers, it has an additional feature that makes it more suited for aftermarket speakers. It has a charge pump built into each amp IC (there are four). This charge pump charges up two external capacitors in parallel, giving each about 12V across them. The amp, when it needs it, then connects these caps in *series* for a quick boost to 24V! When that's done, it hooks them back up in parallel and charges them back up just in time for the next drum beat.
Changing the two 2200uF caps next to each chip to 4700uF will allow for up to 40W/ch with 30W/ch at low distortion. Getting it to fit may be hard and you will need Low ESR rated caps. It's an easy mod tough.
2004 300M Special...157K miles. Needs more mods!
Last edited by hardwareguy; 12-23-2012 at 08:49 PM.