whats the rms of this AYB Q150 amp?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=22556
Printed Date: May 12, 2025 at 8:43 PM

Topic: whats the rms of this AYB Q150 amp?

Posted By: daves_not_here
Subject: whats the rms of this AYB Q150 amp?
Date Posted: December 08, 2003 at 5:12 PM

I've seen this amp I liked it but know people are saying that the discription is bull. could anyone tell me if this is right. the link to the amp is below.

https://cgi.ebay.co.uk/dll?ViewItem&item=3062875479&category=4950

someone said

"its Power = Voltage x Current
so for a 12v car battery and that amp with a 40a fuse that makes

12 X 40 = 480

and then when you take into account class a and class b amps are around 50% effiecient that means we half that figure

480 / 2 = 240

oh dear that leaves us with 240w absolute maximum cos the 40a fuse will have some overhead as well

so the rms per channel is under 60w not 120w"

So now i am confused who is right

Thanks

Replies:

Posted By: Velocity Motors
Date Posted: December 09, 2003 at 9:19 AM

WOW !! Look at the THD rating on that thing !! It's at .1 %, that means that the distortion on that thing will be so high that you will not hear anything but static and some music in the background posted_image

. I would look up the mnaufacturer specs for this if your interested in it, not the specs that the eBayer has on the auction.

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: daves_not_here
Date Posted: December 09, 2003 at 1:49 PM

Thanks for the reply.

I don't know how to contact the maufacturer I have bought amps from this guy before but the makers name was not on the box, the amps i bought before were https://www.allyourbass.co.uk/?menu=5&productid=43

I got them for £60 GBP one for my son and one for his friend. The discription for these was the same on the auction page as on the box, so I think he just copies whats on the box. (are these amps total rubish aswell)

what confuses me is that this guy said. Power = Voltage x Current
so for a 12v car battery and that amp with a 40a fuse that makes

12 X 40 = 480
Is that right?

Posted By: daves_not_here
Date Posted: December 11, 2003 at 1:51 AM

^^^^

Posted By: Durwood
Date Posted: December 11, 2003 at 2:21 PM

Velocity Motors wrote:

WOW !! Look at the THD rating on that thing !! It's at .1 %, that means that the distortion on that thing will be so high that you will not hear anything but static and some music in the background .

It's nice to have high standards for equipment, but 0.1% THD + N doesn't sound NEAR as bad as you described. In fact, I would bet it's probably still below the level of audibility. Now if it were 5% or 10%, which I've seen some amp manufacturers use for their ratings, that would be a different story.

With this particular amp, I'd be more concerned about the power ratings themselves. Supposedly, the amp can do 120W * 4 RMS at 14.4V. That's 480 Watts, or about 33 amps, assuming 100% amplifier efficiency. Considering that most class AB amplifiers are only about 50% efficient, it's really more like 66 amps. Since the amplifier only has one fuse, and it's a 40-amp fuse, I think something's up here...

Scott Gardner

Posted By: daves_not_here
Date Posted: December 11, 2003 at 6:43 PM

OH NO so what is the real RMS of these amps https://www.allyourbass.co.uk/?menu=5&productid=43 we already have sone of them and they only have a 30amp fuse.

Posted By: daves_not_here
Date Posted: December 13, 2003 at 7:04 PM

^^^^

Posted By: daves_not_here
Date Posted: December 18, 2003 at 7:52 AM

^^bump^^

Posted By: Durwood
Date Posted: December 21, 2003 at 6:05 AM

daves_not_here wrote:

OH NO so what is the real RMS of these amps https://www.allyourbass.co.uk/?menu=5&productid=43 we already have sone of them and they only have a 30amp fuse.

A 600-Watt RMS amp with only a 30A fuse? Something's not cricket here. I've never used "Shark" amplifiers before, but with a 30A fuse, assuming 50% efficiency (which may be generous), the most it could honestly produce would be about 180 Watts RMS. The 600W RMS/1600W peak rating on that amplifier is ludicrous.

Scott Gardner