Car audio amplifier help?

Car Audio amplifier setup to OEM HU help.?

• Hi , I have a Volkswagen car with RCD 310 HU. To improve sound, i bought Boston Acoustics GTA1105 amplifier and Boston acoustics SE60 RMS 55 Watt componants and installed in the front. Then i bought Boston acoustics SR65 75 Watt Coaxials and installed in the rear. Bought Scosche SLC4 Line out converter and cadence wk 42 4 guage wire kit and installed everything. Now, When i disconnect the back speakers from amp, the front speakers sound better and when i connect the back speakers the woo quality goes down. Please some one suggest how to get the best quality sound from the system and what are the additions and changes that i have to make to get it better! please also suggest the best available subwoofer for this amplifier. Thankyou. Specifiications of the amplifier are, Number Of Channels: 5 Channels Front and Rear Power @ 4-ohm Stereo (CEA-2006-A): 70 Watts x 4 Front and Rear Power @ 2-ohm Stereo (CEA-2006-A): 125 Watts x 4 Front and Rear Power @ 4-ohm Mono(CEA-2006-A): 250 Watts x 2 Subwoofer Channel Power @ 4-ohm Mono (CEA-2006-A): 250 Watts x 1 Subwoofer Power Power @ 2-ohm Mono (CEA-2006-A): 400 Watts x 1 Frequency Response Front & Rear Channels (-3dB): 10Hz-50kHz Frequency Response Subwoofer Channel (-3dB): 10Hz-50Hz Signal to Noise Ratio (A Weighted): >90dB Lowpass Crossover: 12dB Adj. (50Hz to 200Hz) Highpass Crossover: 12dB Adj. (50Hz to 200Hz) Height: 2-3/8” (60mm) Width: 21-1/4" (538mm) Depth: 8-3/8” (211mm)

• Answer:

  First of all remove the Scosche unit. It is not needed since the GTA already has the same thing via speaker level inputs. It does the exact same thing and may be your problem through maladjustment. Do that, make the appropriate adjustments and come back with your find...