4 ohm amplifier

[monkeybomb]

I am looking for a four ohm amplifier that can turn on when poewr is restored.  My cab is a jukebox and I have invested in a plate sub amp.  Quality is important, so hacking computer speakers is out of the question.  This is what I have found so far

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=245-515

Do you guys know anything cheaper?  

[Homebrew]

    Well the only thing i see about that is that its a PA amplifier.  This means its designed for powering systems that broadcast to a Public Area.  I.E. a high school PA system.  Now i don't know if there's a a sound quality difference or not.  However if you price home audio amplifiers in this power range you're going to ssee they cost alot more.  This makes me think that a PA amplifier might not be as well suited to a musical environment.  I'm not an expert on the subject, just stating my observations.  
    Also, just my experience, but since you're planning to run at 4ohms, this amp's rated output would be 600W, not rms but still.  In my opinion this would be overkill.  The jukebox i'm in the process of building is currently running off all car audio equipment, a 10" kicker sub pushed by about 80W and a set of polk 5.25" pushed by about 25W.  I can tell you this combo is ridiculously loud when cranked up and this is not that much power as you can see.  Again, not trying to tell you what to do, just offerning input in case you're thinking its going to take 600W of power to be loud.  Just my 2 cents.

-Kevin

[monkeybomb]

What exactly is powering those 5.25 polks?

[Homebrew]

I have an old, like early 90's pioneer amp powering them.  I had it laying around and the price was right (free).  I have the sub powered by a soundstream reference 500 amp.  Both amps are powered off a tripplite 60A power supply.  Unfortunatly i'm having many problems i didn't originally notice with this setup.  
    First the tripplite power supply produces EMI and messes with the monitor thats sits the closest to it.  Second, when the system is cranked and the sub is working hard, the sub's magnet distors the monitor mounted directly above it.  I've been working with shielding material trying to fix this, but so far to no avail.  
    I'm now planning to switch to home audio equipment, which is going to be quite a setback financially as well as time wise since i'll have to space out the purchases.  I considered the amp you posted, but as i mentioned in my previous post, i'm afraid it won't have that great a sound quality.  My current plan is to ditch the tripplite supply and power the pioneer amp of a second computer power supply.  The pioneer is only drawing like 10amps, so i'll be fine, the computer power supply i'll use is rated at 20a on the 12v rail.  As for the subs, i'll likely end up getting a pair of these:
http://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=295-414&DID=7

Powered by a pair of these(each is only good for 1 channel):
http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=302-610

An expensive setup, but this is for a dedicated jukebox and i like it loud.  Audiosource is owned by phoenix gold so i have faith that these amps are decent.    As for the subs, i know dayton loudspeaker has been around a while, but i don't know much about them, so i'll probably research them a bit.  

-Kevin

[monkeybomb]

I looked at the mono block amps and thought they were too expensive, seems like a silly thought now.  spending 150 on the wrong thing would have cost a lot more in the long run.  I think I'll go with a temporary solution of an old stereo and move to the mono block amps in a paycheck or two.  Besides I can mount them nest two the sub plate amp I got from parts express.