Headunit help

[apoc585]

Atm i run 2 subs, and splits, but am lookin at gettin a new single DIN headunit that is compatible with my ipod. i found this one but it only has one set of RCA outputs. can i parallel up my subs off the amp so the one input plays through both subs simultaneously or will that not work?
also have i got this right on the back of the unit? (normal speaker output i know also has power, acc etc.)

[Luke0011]

Atm i run 2 subs, and splits, but am lookin at gettin a new single DIN headunit that is compatible with my ipod. i found this one but it only has one set of RCA outputs. can i parallel up my subs off the amp so the one input plays through both subs simultaneously or will that not work?
also have i got this right on the back of the unit? (normal speaker output i know also has power, acc etc.)

I would be good if you could provide a bit more information to answer your question about wirring both your subs in parallel. What exactly are the subs you are running. Are they dual or single coil, what is the impedance of the subs etc. Is your amplifier 1 2 or 4 ohm stable?? The head unit in your picture looks like the alpine CDE-9872r with single preout, which retails for $200. Or you could go the CDE-9874 with dual preout and rotary volume control. And tell us what amplifier you are running... etc 2ch or 4 ch. Most likely you have a 4.

[apoc585]

ok the 2 subs are Alpine R series 12" (dont know if they're the SWR-1242D or SWR-1222D as they came with car) the Amp is an Alpine V12 MRV T757 (I actually also have an Alpine V12 MRV 1507 but doesnt seem to do anything when i disconnect the rca inputs on the side?). According to specs ive found around for the 757 they are as follows:

Birth Certificate rates it at 2x 112wrms @ 12v and 4 ohms!!
rated specs:
*2x75/1x300WRMS into 4ohm at 12V
*2x100/1x400WRMS into 4ohm at 14.4V
typically underrated powerwise considerably (maybe 30~50%).
cooling fan. subsonic filter, 1-band parametric EQ
*variable 12dB/oct HP/LP 30~200Hz
*2ohm stable per channel / 4ohm bridged mono

As for the 1507:
All measurements @ 14 volts unless otherwise specified.
Frequency Response (4 Ohm IHF Load 20Hz to 20 kHz, 1 kHz Ref.): +0 dB, -0.2 dB
L/R channel error, max deviation 20 Hz to 20 kHz: 0.2 dB
Phase Response (4-ohm IHF Load 20Hz to 20kHz 1kHz Ref.): +6.5 degrees, -12.3 degrees
Signal-to-Noise Ratio (Below Rated Output, “A” weighted): -118.2 dB
Distortion at Rated Output @ 1 kHz: 0.25% @ 900 watts
Output Power(resistive) minimum output 20 Hz to 20 kHz @ 1%THD+N (all channels driven into 4 ohms): 274 watts x 2 @ 14 volts; 225 watts x 2 @ 12.8 volts; 140 watts x 2 @ 10.5 volts
Output Power (resistive) minimum output 20 Hz to 20 kHz @ 1%THD+N (all channels driven into 2 ohms): 455 watts x 2 @ 14 volts 371 watts x 2 @ 12.8 volts; 227 watts x 2 @ 10.5 volts
Output Power (4-ohm IHF Reactive Load @ 60 Hz to 1% THD+N): 995 watts
Crosstalk (Referenced to Rated Output, 20 Hz to 20 kHz): -52 dB
Damping Factor @ 100 Hz, 2 ohms: 348
Voltage for Rated Output: 215mV to 4.5 volts
Idle Current Draw: 1.5 amps
Current Draw @ 1/3 Maximum Power: 63.5 amps @ 316 watts
Efficiency @ 1/3 Maximum Power: 36%
Power-Up Noise: -3.7 dB SPL
Power-Down Noise: 22 dB SPL

[holdenboy]

In short, you can wire up both 2 ch amps (thats what it looks like they are) to the one set of preouts, you will either have to use a pair of RCA splitters (see below) or run the RCA cable from the headunit to one amp, then connect a second RCA to the "outputs / line out" of the amp. I dont know whether those amps have a RCA ouput but in that case go with RCA splitters.

What you would do is split the L and R outputs into 2 Ls and 2 Rs, then run
one L and 1 R to each amp (obviously L is Left and R is Right).

Jaycar Electronics