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Power ratings question

Old 02-16-2008, 06:48 AM
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Power ratings question

Hi

What does it mean when a mono amp is only rated at 2 ohms? Does this mean that it cannot be hooked up to a 4 ohm sub?
All the other amps i see, have 2 ratings in their descriptions, one rating at 2 ohms and another rating at 4 ohms. Ususally the 2 Ohm rating is double that of the 4 ohm.

thanks for your help

Jazz
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Old 02-16-2008, 07:41 AM
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You can hook it up to a 4 ohm sub, no problem, it's just that the amp won't produce as much power as it would if the sub were a 2 ohm model. I suspect the reason it it only giving the 2 ohm rating is because that is where it makes its most power.
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Old 02-16-2008, 08:13 AM
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I don't know why. Its a Phoenix Gold that they have on sale at Best Buy for $99.00.
The Phoenix Gold Website is weak. There is no technical information for that particular model.

Jazz
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Old 02-16-2008, 08:54 AM
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If you look at the Bestbuy definitions the '4 ohm - full range' looks like it means peak power. It likely puts out 1/2 of that RMS, which is the number you care about.

edit: I did a google search and the only site where I could find RMS ratings rated it at [email protected], [email protected]
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Old 02-16-2008, 11:37 AM
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you have to go to the litature part on phoenix golds website and it will show you every product.
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Old 02-16-2008, 12:56 PM
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Found it, thanks!

I was planning on getting a 10" sealed sub but after closely looking again at my trunk space, i made a final decision to go with an 8". I will custom make the box for it to fit in a corner in my truck while trying my best to respect the cubic feet required. Most 8" seem to be 4 ohm and between
150 to 200 Watt RMS.
I have not decided on which 8" sub to get but right now its between the Infinity Reference 850W, JL Audio 8W1v2-4 and the
JBL Grand Touring Series GTO804.

I have found 2 amps that i can pick up locally for budget prices.
Phoenix Gold Octane R201
ftp://www.rodinaudio.com/Phoenix%20G...e%20R2.0.1.pdf
and
Infinity Reference 311A
Infinity - Car Audio

Which of the two amps would be a better buy?
Thanks for any help
Jazz

Last edited by Jazz; 02-16-2008 at 12:59 PM.
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Old 02-16-2008, 03:17 PM
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i would go phoenix gold with everything. I really like there stuff. You could get the phoenix gold rsd sub.
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Old 02-16-2008, 03:38 PM
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Originally Posted by hedge View Post
RMS ratings rated it at [email protected], [email protected]

Thats why they dont advertise it 75 watts rms wouldnt sell it lol,these days if it dont say 1000 wrms on it the kids would just laugh.....Little bastards, lmao
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Old 02-16-2008, 03:47 PM
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Originally Posted by 92zed34 View Post
Thats why they dont advertise it 75 watts rms wouldnt sell it lol,these days if it dont say 1000 wrms on it the kids would just laugh.....Little bastards, lmao
I downloaded the PDF manual.
It states:
MAX Power 200W at 2 ohm and 150W at 4 ohm.
CONTINUOUS Power 175W at 2 ohm and 100 at 4 ohm.
Would this be ok for an 8" that states 150W RMS?

I like the fact that it has a defeatable crossover so i can use the one in my head unit.

Jazz

Last edited by Jazz; 02-16-2008 at 03:51 PM.
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Old 02-16-2008, 04:06 PM
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as long as you dont go below 2 ohms youre good
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