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need some help
Posted: Sun Jun 28, 2009 5:02 pm
by schroedes
new member here and a amatuer at best at the car stereo game,as far as hooking it up myself anyways, but i just got my rsdc 12's installed with the ryval 1600w amp and a 2 farad capacitor,by my buddy that thinks he knows what hes doing, but anyways,one of the subs bumps quite a bit harsder than the other one,you guys have any answers for why this would be, they are 4 ohm and we wired em in parallel for 2 ohm, thanks alot!
Posted: Sun Jun 28, 2009 8:09 pm
by AVICJR
Double check the connections on the voice coils of the "quieter" sub.
Posted: Mon Jun 29, 2009 8:06 am
by schroedes
Ive been trying to kinda learn on my own,if im correct,youcant connect 2 dvc 4 ohm subs to be 2 ohm? i understand electrical fairly good,im an apprentice electrician right now, any info from you experts is helpful, thanks
Posted: Mon Jun 29, 2009 8:20 am
by stipud
That's correct... two DVC 4 ohm subs can only be 4 or 1 ohm.
D/C circuits are pretty easy to understand. When you put something in series, you multiply the impedance by the number of items. When you put something in parallel, you divide.
So a DVC 4 ohm in series = 4 ohms * 2 voicecoils = 8 ohms
a DVC 4 ohm in parallel = 4 ohms / 2 voicecoils = 2 ohms
Two 8 ohm drivers in parallel = 8 ohms / 2 subs = 4 ohms
Two 2 ohm drivers in parallel = 2 ohms / 2 subs = 1 ohm
Here are your wiring options:
http://www.rodinaudio.com/pgMobile/pdf/ ... lVoice.pdf
I would personally recommend 4 ohm for stability's sake. You will lose half the power at 4 ohm compared to 2, but the rule of thumb is that every time you double power, you gain 3dB. As such, you will only be ~3dB down compared to 2 ohms. If you wire it at 1 ohm, it should work, but it will get very very hot, wear the internals quicker, and sound quality will suffer.
Posted: Mon Jun 29, 2009 10:03 am
by schroedes
ok, and on the ryval amp there are two positive leads and two negative, i take it that this is for 2 subs, dude hooked the rsdc's so they are both fed out of the one positive lead,not sure why he did this cuz im guessing its wrong
Posted: Mon Jun 29, 2009 10:15 am
by stipud
The two + and - leads are internally wired in parallel and only there to help wire up two subs. So no he is not wrong, though if you bothered running two wires you might as well use both terminals...
If you have your multimeter, disconnect the speaker wires from the amp, and measure the D/C resistance of each speaker. They should both be the same... if not, that's why one is playing louder than the other.