SQ Amp Advice; Power Ratings Question

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BigJMan

Member - Posts: 22

Joined: June 09, 2003

Location: United States

Posted: July 23, 2003 at 6:09 PM / IP Logged

Hey everyone,

I was just wondering if any of you knew of any good sq amps that could push 110w RMS x 2 @ 3 ohms, I know I should probabably search the internet for hours or something instead of asking, but I hardly know where to start. I also need an amp that pushes 225w RMS x 2 @ 3 ohms.

Yes, I know that an amp that pushes 2000wrms @ 1 ohm pushes 1000wrms @ 2 ohms and 500wrms @ 4 ohms, but not all company's rate their amps that way, and some don't even follow that rule at all - for example some amps I've seen don't even double power pushed when the ohm load is cut in half (I don't understand why not), so how could one find how much power is being pushed in between 4 ohms and 2 ohms in that situation? Who knows, that's why I call upon the power and knowledge of the12volt.com for help and advice.

Thanks

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sonicsound

Copper - Posts: 100

Joined: July 08, 2003

Location: Wisconsin, United States

Posted: July 23, 2003 at 9:44 PM / IP Logged

OK well all I have to say is JL Audio amplifiers. JL audio makes most of there subs at a 3 ohms so there amps can take anything you put in front of them from 1.5 ohms to 4 ohms. for each of those applications you have you could run a JL 250/1 for each. The amps made by JL Audio are unbelievable. Check out any of the reviews for the "/" amps. Hope that helps....

Sonic

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wvsquirrel

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Posted: July 24, 2003 at 1:15 AM / IP Logged

Easiest "off-the-hip" method is to simply take half the difference of the 2 and 4 ohm ratings, then add that to the 4ohm rating. It may not always be "exact", but it will get you close enough to the right figure.

Example 1 (Multi-Channel amp)

200 x 2 @ 4ohms and 400 x 2 @ 2ohms would equate to apx 300 x 2 @ 3ohms.

[(400-200)/2]+200 = [200/2]+200 = 100+200 = 300

Example 2 (Multi-Channel amp)

200 x 2 @ 4ohms and 300 x 2 @ 2ohms would equate to apx 250 x 2 @ 3ohms.

[(300-200)/2]+200 = [100/2]+200 = 50+200 = 250

Example 3 (Mono amp)

300 x 1 @ 4ohms and 600 x 1 @ 2ohms would equate to apx 450 x 1 @ 3ohms.

[(600-300)/2]+300 = [300/2]+300 = 150+300 = 450

Remember to use the "per channel" RMS ratings. Do Not use the 4ohm mono/bridged rating if you are looking at a 2 or 4 channel amp since most multi-channel amps are not stable below 4ohms mono/bridged.

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BigJMan

Member - Posts: 22

Joined: June 09, 2003

Location: United States

Posted: July 24, 2003 at 10:13 AM / IP Logged

thanks for the quick replies, I'll have to check out the JLAudio amps, and thanks wvsquirrel for the advice on calculating a 3 ohm load, that's how I thought one would do it, but it still doesn't explain why some amps don't double wattage pushed when resistance is cut in half.

1992 Lincoln Towncar Cartier

4.6L SOHC Dual Exhaust

Stereo System - Working On It :)

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SQ Amp Advice; Power Ratings Question

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