With those componants, will sound real good once all is correct.
Amps can cut out if not enough power is available or is too hot.
My Sony radio did that all the time. Then i got a Sony 222 amp. No change
Then i connected that amp to a factory radio. Same deal as you. Rears ok, fronts too quiet. 4 ch time. Solved.
Even if the radio has high power, rear channels are getting reamped higher again, while fronts are not.
The radio output is the same f +r, but the rears are being Alpined. Fronts are 1x boosted, rears 2x.
The best balance is to connect all 4 channels from radio to one 4 ch amp. Then the F/R input levels will match again.
Worth the many hours one will spend wiring and adjusting.
Subject: Amping all eight speakers. Radio fader, balance, volume controls will be operational,
Task: Rewiring 4 front speakers (dash), 4 rear (door and 1/4 panel), 4 channel amp to radio.
Assuming: Amp and radio power/ground connections are correct and need no further attention.
Notes:
Prep ahead to minimize confusion and time. Notes and hand diagrams a plus to save for later reference.
Lots of wiring. I have long wires and connections stuffed behind console (radio to amp) and under seat (speaker connections).
Helps greatly to mark wires with tape and label LF, RF, etc at the amp connections. And have easy access to them.
Black Sharpie on clear tape ok.
Label either the plus wire or negative (ground) the same way on all wires.
All front channel speakers to be wired in series to protect amp.
Series wiring each pair of speakers (one 3.5, one tweet) gives 3 ohm + 3 ohm= amp 'sees' a safe 6 ohms.
Plenty of power will be available. Amping all speaker will make everything come alive.
Make sure + and + connections do not get mixed up or will have weak sound or unclear stereo separation.
Front speakers to rear speakers level will be matched using the amp f/r gain (volume) controls.
Overall volume, balance, fade will be adjusted at the radio.
Radio head unit wiring (output) to amp (input).
Disconnect radio F output from FT speakers and connect hose radio wires to amp F input.
1- Radio LF +/- speaker output to amp L front speaker level input.
2- Radio RF +/- speaker output to amp R front speaker level input.
3- Radio to rear speakers is already connected. Amp may be in 2ch mode. Switch to 4 ch mode.
4- One set of rear speakers may be connected to amp front speaker out. Rewire.
Front LF speaker wiring:
Parallel wiring two 3 ohm speakers together results in 1.5 ohms, too low for amp.
Series wiring mixes + and - but will sound fine in this case.
1- LF wire from amp LF (-) speaker terminal to LF 3.5 speaker (+) terminal.
2- Wire LF 3.5 speaker (-) terminal to LF tweet (+) terminal. Cross wiring here makes a series connection.
3- Wire LF tweet (-) terminal to amp LF (-) speaker terminal.
Repeat for RF.
Rear speaker connections.
With two 4 ohm speakers , can wire series or parallel. Parallel is simpler. Positive to positive, neg to neg.
Connecting two 4 ohm speakers together in parallel is safe for amp (4 ohm + 4 ohm= amp 'sees' 2 ohms).
1- LR wire from amp LR + speaker terminal to door and rear speaker +.
2- LR wire from amp LR - speaker terminal to door and rear speaker -.
Repeat for RR.
Speaker summery JBL:
1- LF dash 3.5" + 3/4" tweet, 3 ohms each.
2- RF dash 3.5" + 3/4" tweet, 3 ohms each.
3- LR 6" door and 6" rear, 4 ohms each.
4- RR 6" door and 6" rear, 4 ohms each.
Wire each front channel together in series. Total 6 ohms each channel.
Wire each rear channel in parallel. Series is 8 ohms, parallel is 4 ohms each channel.
Notes:
Before turning on system, turn down Alpine's front and rear gain adjustments (loudness) to minimal for now.
Double check Alpine amp switches per document.
1- Input config switch up to 4 channel config.
2- Hi pass filter switches F/R up for now, input signal switch down for speaker level input or up if using RCA from radio.
3- Set radio to about 1/2 volume. Adjust Alpine F/R gains (F/R volume levels) clockwise (louder) for best sound.
http://support.alpine-usa.com/produc...M_KTP-445U.pdf
http://www.regiscoyne.com/tech/spk_cab_wiring/
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