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Car Forum / Driving, Maintenance, Tuning / Car Audio / February 2006Last few questions before install
I should have my two amps arriving tomorrow and just wanted to be sure I got everything right before I put it all together this week. Heres what I have: Sony cdx-mp30 50x4 HU - 2 sets rca outs Profile 2 channel 400W subwoofer amp Max Power @ 4 Ohm = 1x400W RMS Power @ 4 Ohm = 1 x 200W Max Power @ 2 Ohm = 1 x 600W RMS Power @ 2 Ohm = 1 x 300W Profile 4 channel 400W speaker amp Output Power @ 4 Ohm = 4 x 100 WATTS RMS Power @ 4 Ohm = 4 x 50 WATTS RMS Power @ 2 Ohm = 4 x 75 WATTS Bridged RMS @ 4 Ohm = 2 x 150 WATTS A pair of Polk DB650s 2-way 180 watt 60 RMS A pair of Kenwood P605IE 2-way components 200 watt 50 RMS 2 10" subs in an enclosure (yet to know specs, but shouldnt be too cheap or too expensive) 4 awg wire from battery to an 80 amp in line fuse within 6 inches from battery, running along side drivers side into trunk. There, the 4 awg wire goes into a dual 40 amp fuse distribution block to two 8 awg wires into each amp. Amps are grounded seperately to chassis with 4 awg wire. Looking in the trunk, seems the best space to mount them is under the rear deck. A short run of 12 awg speaker wire from the 2 channel amp to the sub(s). 12 awg wire from the 4 channel amp to the rear deck and to the front panel speakers, avoiding running with the main power wire. 2 sets of home made rca heavy guage twisted stranded wire running from HU to each amp avoiding running parallel to any power wires. 1st question. Is the 80 amp and two 40 amp fuses good enough for the load? 2nd question. Assuming the subs are 4 ohms and over 300w peak power, would it be best to run parallel or in series? Still having a hard time with that. 3rd question. Are the components best in rear or front fill? 4th question. What is the amp rem wire for? The amps just arrived, and than I noticed that the 4 channel amp has 2 sets of rca inputs for channels 1 through 4. The 2 channel amp has 1 set of rca inputs. Should I use a splitter or I think its called an LOC? blahhh I would ground your amps to the same spot to avoid the chance of ground loops (there be different negative potentials at each spot). And then let me give you the GREATEST PIECE OF ADVICE I CAN GIVE......DRUM ROLL PLEASE...... Run a 12 gauge wire (or both pairs of 16 gauge speaker wire) from your HU ground (or HU chassis) to your amp's grounding point. This is called alternator-whine-eradication-insurance. Sure, if you don't do this you may not have any problems. BUT IF YOU DO, you will wish you had done it while you were installing the whole thing (and it's cheap, quick and easy) so in my experience it's best to do it whether it's needed or not. MOSFET >I should have my two amps arriving tomorrow and just wanted to be sure > I got everything right before I put it all together this week. [quoted text clipped - 40 lines] > > 4th question. What is the amp rem wire for? For those amplifiers you should be running one 60 and two 30 amp fuses, but since your amplifiers are fused already 80 amp and two 40 amp fuses will protect your power lines just fine. >1st question. Is the 80 amp and two 40 amp fuses good enough for the >load? If they are single coil 4ohm, none of the below. run each sub from it's own channel >2nd question. Assuming the subs are 4 ohms and over 300w peak power, >would it be best to run parallel or in series? Still having a hard >time with that. Front, only because the tweeters wont do much for you in the rear of the car. But that's a personal opinion. >3rd question. Are the components best in rear or front fill? remote on/off wire, it connects from you HU to your amplifiers or anything else that needs to be triggered on and off via hu., >4th question. What is the amp rem wire for? Awesome, thanks for your input. As far as the rem wire, can I split that to both amps without any trouble? Now that Im looking at the 2 channel amp, it only has one channel out (+ and -), wtf?? Apparantly not a 2 channel amp. So, the easy way doesnt appear to be an option, grrr. Maybe it will sound better with one sub? From what I have heard, as long as you are only paralleling the remote wire to one other amplifier, you should be fine, but after that, you should invest in a relay. maybe someone can confirm?  Signature- AUSTIN BECKER > Awesome, thanks for your input. As far as the rem wire, can I split > that to both amps without any trouble? > Now that Im looking at the 2 channel amp, it only has one channel out > (+ and -), wtf?? Apparantly not a 2 channel amp. So, the easy way > doesnt appear to be an option, grrr. Maybe it will sound better with > one sub? Right now I have 3 amps, Epicenter and a x-over running off the hu remote without a relay, it's been that way for about two years without problem. >From what I have heard, as long as you are only paralleling the remote wire >to one other amplifier, you should be fine, but after that, you should >invest in a relay. maybe someone can confirm? So what you have is a mono block then? Profile amps are cheap, why not buy another one for the other sub? >Awesome, thanks for your input. As far as the rem wire, can I split >that to both amps without any trouble? >Now that Im looking at the 2 channel amp, it only has one channel out >(+ and -), wtf?? Apparantly not a 2 channel amp. So, the easy way >doesnt appear to be an option, grrr. Maybe it will sound better with >one sub? I cant buy anymore, my wife would kill me. I already spent more than I should. I wasnt planning on going this crazy, but I do have a single 10" enclosure incase the 2 drain too much juice. The amp for the sub only has one channel out. I could parallel the subs, but would that cause to much strain on the amp and not be as thumpy? If in fact the amp is a mono block and rated for a 2 ohm load (should be I have never seen a mono block that wasnt) and both of your subs are single 4ohm coil you should run the subs parallel for max power output. What is the model number of the amp in question? >I cant buy anymore, my wife would kill me. I already spent more than I >should. I wasnt planning on going this crazy, but I do have a single [quoted text clipped - 3 lines] >subs, but would that cause to much strain on the amp and not be as >thumpy? Its the 400 MSX, http://www.profilecaraudio.com/Manuals/400MSX%20+%20600MSX%20Amps.pdf I had one of those. Blue in color with a big red power light on top. It's a mono block and it will do two ohms. >Its the 400 MSX, >http://www.profilecaraudio.com/Manuals/400MSX%20+%20600MSX%20Amps.pdf Has anyone heard of any drawbacks using the HU's rear channels to the amps high line in? I dont know wether to split the RCA's, use an LOC, or use the high line in.... Aggh, so many if's. Also, it says in the manual if using the high line outs to make sure the HU is a "floating ground" but my manual doesnt specify. Im guessing it is since its fairly new and thats the most common ground. How can I be sure? |
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