posted
I am looking for an amp to push two momo 10's they are 400 rms 800 max. I would like some suggestion on a good amp to do approx 900 watts at 2 ohms to power these subs please suggest as many as possible, notice I am looking for reliable amps at good price
Look for an ESX Q4751 or Q2752 (friend of mine is selling one on ebay http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=304340342 great amps for the money, built like tanks, I've owned 3 ESX amps, loved them all, just switch things around a lot hehe. Jesse
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Posts: 135 | From: San Luis Obispo, CA | Registered: Feb 2000
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posted
Well, if you talk to an RF rep, they will tell you that the amps are not stable to 2 ohm mono and the speaker load is above 2 ohm across its entire operating range, and thats how its done.. But we know differently, right Dukk? :-)
ShadowStar
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Posts: 2579 | From: Somewhere In the Northeast | Registered: May 1999
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posted
umm, if anyone can tell us everything about RF products, dukk can....and although i'm not a rockford fan, i agree with him on this one, a 500a2 is perfect for you
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Posts: 1930 | From: state college, pa | Registered: Sep 1999
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posted
Sure a RF amp can run at 2 ohm mono...but its not recommended. Why, well because it wasnt designed to run like that. It WILL get hot...and although it might not shut down in some cases, it WILL heat up the insides of the amp, thus making the life expectancy of the amp much shorter. Why risk it when you could get a nice durable amp that is stable to that sort of ohm impedance. Not sure exactly what kind of budget but maybe something like a PPI PC 1800 would be nice or a little cheaper would be something like the Hifonics Zeus 600. Im sure there are lots of other amps that might work, but those were just a couple off the top of my head. Hope it helps...Later.
posted
well I'm not really a rockford fan either.. but I'd have to agree with Dukk, there are tons of people out there running amps like that at low loads with no problems. PG XS2500 would also work great, maybe a little less power than the 500a2 but similar. I've ran one at 1.3 ohms for ages, I did blow it..(running at 1 ohm mono) but that was my fault.. (can we say 90 amps of fusing??) also, people say the RF wasn't designed to run 2 ohms mono... well from what I can tell RF, PG and others are overbuilt/overdesigned.. they may say 4 ohms is the lowest, but for reliability they're often overbuilt.. and if the amp has resonable protection circuits incorperated it's gonna work just fine. if it gets hot, it shuts off etc etc.. I'd say go for it.
------------------ Digital Designs 9515 Mmats d300hc (2) (soon) Pioneer source MB Quart fronts ADS power plate RW Audio processors http://www.geocities.com/motorcity/6128 Member of Team Hertz Canada
Posts: 736 | From: Calgary AB | Registered: Oct 1999
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Although not rated as such, I cannot remember the last time I sold a Punch amp that left running OVER 2 mono. It is automatic...
As far as longevity, my 1992 60DSM has been running 2 mono since I got it (nothing easy either - Pro 12s ported, now Punch 15s) and it has never even shut off...
The biggest problem I see is people don't realize how much more power it takes to run 2 mono (regardless of brand). You get buddy with a stock Honda string some 8ga to the back and drop in a 500a2 off 4 10s with the Punch EQ and gains cranked). Yep, it shuts off or blows up. I feel no sympathy...
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posted
I realize Dukk knows his ****, but the older RF amps take low impedence MUCH MUCH MUCH MUCH MUCH (need I say more?) better than the new ones. I wouldn't have a problem running a 250.2 at 2 ohm mono, but I simply wouldn't do it with a 500a2 when it's not necessary...why? Why not just get an equal amp for the same price that is suppose to do 2 ohm mono? Seems silly to me...If you were competing in a 500 watt class and trying to get a tad more power or something, sure, go for it, but it's not something I'd do for a daily driver, or with a new model RF amp. Why not just get an ESX Q4751 (a couple guys are selling them at Elite for $250) which is a huge amp, very nice, will do 900+ at 2 ohm mono and not heat up worth a darn. 24 dB crossover, subsonic, true mono amp, I just don't see any reason to add risk to a situation when it's not necessary. Jesse
------------------ Cheap capacitors: www.angelfire.com/mb/norton/capacitors.html Email me for other cheap car audio prices.
Posts: 135 | From: San Luis Obispo, CA | Registered: Feb 2000
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posted
I've run every damn RF amp I've owned @ 2 ohm mono - you will have NO problems with it. Keep the gains at a respectable level (SET RIGHT) and you won't have a problem...
Ran: 250M^2 250.2 225.2
and some others but I can't think of any others off the top of my head...
NO reliability probs, either.
------------------ 17600 watts in a daily driver. Because too much is JUST right!
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I only owned one RF amp...it was a 40IX. It was at 2 ohms mono and I had problems with it but I ran that thing into the ground. It also might have been my install..this was many years back...
------------------ Robert (Rob) - 1996 Chevy Cavlier 2.2 Member Of "Team Gates" and "Team ProAudio" USAC Sactioned Judge
posted
Sorry, but running an amp past its ohm impedance rating is just uncalled for. I would laugh someday if your trunk catches on fire for something like that. Why not, for $100 more, get a real amp that was designed to take that abuse...like a Cadence a7hc(would put out around that much power at 2 ohm, and then you could upgrade to run it at 1 ohm someday as well...like to see an RF amp do that), or go for big power and get something like a JBL PowerValve...1200 x 1 at 2 ohm mono. I like the ESX idea myself because it is a cheap but good, reliable amp. Just my thoughts on the subject...Later.
posted
Dude - you are delving into areas you know nothing about.
A Punch amp will handle 2 mono no problem if you address the power side correctly (as you should any amp making lots of power).
As for:"get a real amp that was designed to take that abuse...like a Cadence a7hc" I have no comment but I did snicker... No offence to Cadence lovers, but come on...
Finally: "at 1 ohm someday as well...like to see an RF amp do that" - Well, let's see... The 250m2/x2/.2/500m did 1 ohm no problem and the new bd1000a1 will too. Oh, and let us not forget the 50 series from RF - I got a wall of 24 10s all parallel that would like to see your Cadence... But as Hertz_So_Good wisely stated; "I've always said...what's the point in arguing with someone who so obviously "KNOWS" the answer..."
Bingo....
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