ya i heard about sundown amps too. they used to be insured for .5ohm but to many people were blowing them from unsuficient charging systems so they are no longer .5 ohm stableinsured
ya im pretty much leaning towards that at the moment. ie been consitering 2 of the new aq amps strapped or 2 nine.1's strapped...etc something strapped that makes 2ohm final independence.
2 ohms is way better than .5, so if you're getting a new amp(s), definitely get something that will do the power at 2 ohms.
Posted from GlassWolf's site, because it's buried in the amplifier fundamentals section: ------------------------------------------ Even though an amplifier may be rated for continuous use at 2 ohms, there are several reasons why this is not the best thing to do:
Paralleled speaker loads may be lower than you think: As stated before, the actual impedance varies and the minimum impedance may dip considerably below 2 ohms at certain frequencies. Lower impedance loads mean more losses and more heat dissipation in the amplifier (see next item).
Heat Considerations: Operating an amplifier with a low impedance load increases the heat dissipation of the amplifier (try it if you don't believe it!). This is because low impedance loads require more current, which taxes the amplifier's power supply more severely. More current means more losses(which translates to more heat). Excessive heat is unhealthy for electronic devices and should be avoided.
Increased Line Losses: As the speaker impedance is lowered, more of the audio signal is lost (in the form of heat) in the speaker cables! This can become significant if you run long cables. Speaker wires have resistance (the value depends on the thickness and length of the cable); if the speaker impedance becomes very low the resistance of the speaker wire may no longer be insignificant. To prevent this problem, the cross sectional area of the speaker cable conductor must double for each halving of speaker load impedance! In other words, running 2 ohm loads means using VERY heavy speaker cables.
Damping Factor degradation: Using super low impedance loads on an amplifier will degrade the system's damping factor (discussed in detail below). Degradation of damping factor means that the amplifier will have less "control" over the speaker system, possibly resulting in "boomy" bass response.
So, just because an amplifier has a super powerful 2 ohm rating, don't look for ways to wire up multiple speakers in order to "use" this power! Treat the 2 ohm rating as "headroom" and know that your amp has the ability to more easily handle the most difficult "normal" speaker loads that you are likely to ever encounter. If you need more power, get a second amp. Two medium powered amps are better than one monster (what if your one big amp dies? With two smaller amps at least you can still run!). -------------------------------------------------
IA40.1 better than all the amps mentioned will run .5ohm with ease, will cost close to $1000 unless you find a super deal. plus after impedance rise you'll be close to 1ohm anyway.