if i was doing a setup that needed the car off and i ran 14v batts. best believe DD is my ish. If i had a lil extra cash and wanted some good power for daily its my ish.
---------- Post added at 04:06 PM ---------- Previous post was at 04:05 PM ----------
i dont think DD is worth the money i know they make a killer product but danm
So what I'm understanding as the main takeaway is that although the output power might fluctuate slightly, it is the goal of most amp manufacturers to have the power supply input regulation to be as tight as possible. Right?
Since it seems like most cars' alternators, mine included, seem to hover around 13.8 volts, I feel that companies should measure their advertised specs at that voltage.
Corollary to the takeaway: if you get x amount of wattage out of an amp at a particular voltage, say 13.8, you shouldn't really expect your music to be louder if you suddenly increase your voltage to 14.4 or higher.
DD rating their amps at lower voltage is good for two reasons. First, it helps with competiton ratings And more importantly, it gives you a much better idea what you'll actually see on a 12v system.
It is true that DD's (well, at least the M3a) don't like much over 15v, they certainly make more power at higher voltage. they don't open up like some *coughD5cough*, but obviously they benefit as evidenced by my testeing last weekend.
- 3,657w @ 11.2v
- 4,088w @ 13v
400+ watts isn't earth shattering, but that is only a 1.8v difference. If you can hold 14v, you're looking at a 1k difference. And in the world of SPL, that 400w was worth .8 on the TermLab.
With the huge amplifiers that are out now a days can draw huge amounts of current without batting an eye. So most reputable companies will rate at 12-12.4 or so volts because dropping below that 13.8v is extremely easy. The good thing about rating at 12v is that if you can stand to stay above that the amplifier will have higher output.
you can do some simple math to figure this out, however it's not 100% perfect because I am not account for efficiency
lets say you have a 1500w amplifier
Watts/volts = amperage
1500/12.4= 121 amps rounded up
so we take the same amount of amperage times a higher voltage, say 13.5v and we get
13.5v*121= 1633 watts
1633-1500= 133 more watts..
you see with the lower spec rated at 12v we get slightly more power.. and this can help a lot in the competition lanes. The gain can be much more but that's dependent on the amplifier.
and we can use some more math to find out how much of a change that would be...
L =10log (P/Pref)
Pref= original power
L =10log (1633/1500)
10 log(1633 / 1500) = 0.368949257 dB change.. It's completely inaudible but could be the difference between a win and a lose.
The difference in bigger amplifiers you will see a manageable difference... but overall in a daily situation it doesn't mean much.
Oh and that's not account for power compression.. blah blah blah.