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View Full Version : HU's with DC-DC converter x hu's without it..



Slaugh
12-03-2006, 08:40 PM
hi, i want to know exactly what does that small box attached to the back of some HU's do. I know it's a DC-DC converter and has something to do with RCAs or some sht... how does it work? does a hu with it has improved SQ from it? i realized the best sq hus have it, even thou i noticed alpine 9815, for example, doesn't have it, while 9835 has.. that's weird, considering they should be the same hu after all

9815

http://img157.imageshack.us/img157/7996/17ad3oy0.jpg

9835

http://img91.imageshack.us/img91/3030/98355dl9.jpg

so... does it do something or what?

duece212
12-03-2006, 08:42 PM
Had one of those on one of my panasonic decks too...no idea what it does except being a pita and taking up more room behind the dash

Raven
12-03-2006, 08:55 PM
If it's a straight DC-DC converter, it probably converts 12vdc to something higher so the amp itself draws less current and produces less heat. Either that or a few strategically laid capacitors to provide power conditioning.

Honestly I don't know, I'm just speculating.

Slaugh
12-04-2006, 07:25 AM
thanks anyway

more help? i really want to know

pwnt by pat
12-04-2006, 07:35 AM
my 9860 has one. It converts a small digital signal plug to either toslink or another kind of digital cable to use less space directly behind the radio.

bballrrt06
12-04-2006, 08:04 AM
i dont think the one on your 9860 is the same that he's talking about.. the 9855 had one too, i was under the impression it had to do with the rcas as well. possibly converting 12v to 4v pre-outs? i don't know i could just be sounding like an idiot.

Slaugh
12-04-2006, 08:11 AM
some of the best sounding head units out there have it.. it must be some good **** yo :naughty:

Alpine CDA-7998

http://img91.imageshack.us/img91/1045/dscf1197fq6.jpg

Eclipse cd8454

http://img228.imageshack.us/img228/4210/7f3ap8.jpg

Alpine CDA-7878

http://img228.imageshack.us/img228/9876/img0017eq5.jpg

Alpine CDA-7995

http://img237.imageshack.us/img237/7867/4332imgoz9.jpg

bdawson72
12-04-2006, 08:15 AM
i didnt even kno that the eclipses had them....what was i paying attention to when it was installed

Slaugh
12-04-2006, 11:53 PM
anyone has the answer?

heyman421
12-05-2006, 12:10 AM
i would imagine they just relocate the voltage converter to the external box to lessen noise?

Slaugh
12-05-2006, 07:27 AM
i would imagine they just relocate the voltage converter to the external box to lessen noise?

nope... some players have it, while others, don't...

look at these pictures

7998

http://img154.imageshack.us/img154/9705/7998oo4.jpg

9815 (no converter)

http://img134.imageshack.us/img134/4246/ag3uh3.jpg

notice also that the converter is meant for the preouts... any idea, anyone?

heyman421
12-05-2006, 11:07 AM
it's a voltage regulator for the cd transports

it runs high ampere, low voltage for less noise

and again, i imagine it's external for the same reason, to lessen interference

alpine says specifically to keep it away from the antenna and pre-outs

Slaugh
12-07-2006, 03:36 PM
ne1

willisweed
12-11-2006, 05:26 PM
hi, i want to know exactly what does that small box attached to the back of some HU's do. I know it's a DC-DC converter and has something to do with RCAs or some sht... how does it work? does a hu with it has improved SQ from it? i realized the best sq hus have it, even thou i noticed alpine 9815, for example, doesn't have it, while 9835 has.. that's weird, considering they should be the same hu after all


i have the 9815 and mine has it....do you have a 9815 and it doesnt have it or were you just going off of what you heard?

Slaugh
12-11-2006, 05:54 PM
sorry dude, but the 9815 doesn't have it... can you supply us with a pic that shows it?

adam71
12-11-2006, 06:12 PM
All decks and as far as I know ALL 12 volt electronics have a dc-dc converter. Just like home electronics have an ac-dc converter. As said above it more or less regulates the dc voltage being drawn by the power supply of the unit. The reason this deck has one exterior is most likely for reducing heat in the main chassis or lessening the likelyhood of induced noise into the system. Usually you only see exterior converters like this on more higher end units like the Clarion drz-9255.

Slaugh
12-11-2006, 08:08 PM
but why does it usually show the DC-DC thing next to the preout on the head units specs? it seems like the converter is for the preout

heyman421
12-11-2006, 08:13 PM
preouts are ac, so what in THE hell would a dc-to-dc converter do for the preouts?

Slaugh
12-11-2006, 08:35 PM
preouts are ac, so what in THE hell would a dc-to-dc converter do for the preouts?

that's what i have been asking all this time... but it seems like this converter has to do with it..

explorer2
12-11-2006, 10:19 PM
All decks and as far as I know ALL 12 volt electronics have a dc-dc converter. Just like home electronics have an ac-dc converter. As said above it more or less regulates the dc voltage being drawn by the power supply of the unit. The reason this deck has one exterior is most likely for reducing heat in the main chassis or lessening the likelyhood of induced noise into the system. Usually you only see exterior converters like this on more higher end units like the Clarion drz-9255.

I have a cheap jensen deck that has a converter. Really all it does is condition the power and regulates it, may even have a cap or two in it to compensate for voltage drops.