PDA

View Full Version : Do companies lie about the watts RMS their HUs put out?



HeHeHaHaHoHo
06-16-2011, 10:16 PM
I'm looking for the highest powered HU you can get, and I'm really hoping for HD radio.

I saw the Kenwood KDC-HD548U says it puts out 22 watts RMS, but I don't know if I should go by manufactured rated specifications.

Phoenix Risen
06-16-2011, 10:18 PM
why not just get a small 4 chan to run your fronts and rears?

Pyro_By_Nature
06-16-2011, 10:22 PM
No, most of them don't lie. The question more or less is how cleanly it does that power. It's also worth noting that you won't hear a difference in +/- 5 watts anyways. A small 4 channel to run your speakers would be ideal, but this is going to add in extra costs/work.

Kangaroux
06-16-2011, 10:26 PM
its not that companies lie about the ratings, its that they dont tell you the important differences between peak and RMS

whitedragon551
06-16-2011, 10:29 PM
If you want a higher powered internal amp look at the JVC KD-AR8500, Alpine V-Drive head units, or an Alpine HU with the KTP445 power pack.

HeHeHaHaHoHo
06-16-2011, 10:34 PM
Would having 50 watts RMS be that much of a difference than 22 watts RMS if I'm not going that loud?

Phoenix Risen
06-16-2011, 10:41 PM
personally i dont think you will hear much of a diff between the 2.

HeHeHaHaHoHo
06-16-2011, 10:50 PM
personally i dont think you will hear much of a diff between the 2.

I'm thinking option A) HD radio B) Pioneer Power Pack with Pioneer Non-HD radio

Which option would you choose? I listen to the radio a lot.

HeHeHaHaHoHo
06-18-2011, 03:36 AM
???

The_Grimy_One
06-18-2011, 03:42 AM
I would go with the alpine deck and the power pack. Should sound very good for what u want.

HeHeHaHaHoHo
06-19-2011, 03:09 AM
I would go with the alpine deck and the power pack. Should sound very good for what u want.

Thanks for the input. I think I might do that. If anyone else agrees, feel free to say so.

HeHeHaHaHoHo
06-19-2011, 03:09 AM
I would go with the alpine deck and the power pack. Should sound very good for what u want.

Thanks for the input. I think I might do that. If anyone else agrees, feel free to say so.

kushy_dreams
06-19-2011, 03:30 AM
I agree, that alpine power pack is pretty much plug and play iirc, a 5yr old could install it

whitedragon551
06-19-2011, 09:05 AM
I agree, that alpine power pack is pretty much plug and play iirc, a 5yr old could install it

It is plug and play. The only thing you do is use the switch to select low or high gains.

JL Audio
06-19-2011, 09:13 AM
If you want a higher powered internal amp look at the JVC KD-AR8500, Alpine V-Drive head units, or an Alpine HU with the KTP445 power pack.

good god I miss that headunit.. best i've ever owned.

whitedragon551
06-19-2011, 09:14 AM
good god I miss that headunit.. best i've ever owned.

I looked for one for about 2 months before I bought my 9887. Thats the one I really wanted.

HeHeHaHaHoHo
06-20-2011, 12:00 AM
To adjust gain, you turn it to the highest it can go then turn it down a little bit, right?

zako
06-20-2011, 04:54 AM
I'm looking for the highest powered HU you can get, and I'm really hoping for HD radio.

I saw the Kenwood KDC-HD548U says it puts out 22 watts RMS, but I don't know if I should go by manufactured rated specifications.

Yes. They lie in a certain way. That rating is not Cea certified RMS rating, like reported by amplifier manufacturers for example. Some head unit manufacturers try to stay honest by reporting cea certified and their own rating. I recently saw a new head unit (Alpine or Pioneer, forgot which one), and it reported on the box 22watts RMS but only 14watts certified RMS. Moreover, it has been reported that some of the recent "high wattage" Kenwood head units have a nasty habit of overheating and cutting off the volume.

keep_hope_alive
06-22-2011, 06:06 AM
Don't forget the distortion at their rated power. Sure, you may be able to measure that number for a short while, but it won't be listenable. you get about 5-8W RMS of listenable power.

And the output is bridged, so your 22Wx4 is basically a 5.5Wx8 bridged... But the size of a credit card.

A 50x4 external amp is a night and day difference, sounds like you got new speakers with tons more clarity and volume.

The KTP is the next best thing, but still no match for a true external amp.