Question about Infinity 475A Car Audio Amplifier

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Wiring Advice Please can you help??I want to wire my new amp into my exisitng system - I wanted the amp to drive the front two speakers and a subwoofer.I have wired in the front channel input and output (easy!) but what do I then do with the subwoofer? can i wire it straight into the rear output of the amp, set the filter to LPF and adjust freuency and bass boost??? Im conbfused with the dials are these to adjuct inputs or outputs??

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Re: Wiring Advice

All that you need to do is hook the rca to the in of the read input of the amp and hook the woofer up you may bridge the woofer but look at RMS of the amp on one changel and times it by two and make should that the RMS of the bridge dose NOT rich the MAX of the sub if it does then you will blow the sub it is your chors on wha you want to do. Now turn the filter to then the LPF and turn the gain up first and then the the freuency but DO NOT turn it all the way  ONLY go about half way up and at last you can turn the bass boost up but it will make it sound bad if you turn it all the way up.

Posted on Oct 29, 2007

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Re: Wiring Advice

They are to adjust output levels. yes you can hook up the sub to the amp. it is not wise to hook up the front speakers with the sub though. just get a less powered amp to drive the front speakers. 

Posted on Oct 29, 2007

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I have phase linear uv8, need to know how to get subs 2 work! Amp goes into protect mode when rca's r plugged in, there r 3 sets of preamp out puts 1 front left and front right, 2nd is rear left rear...

try testing the amp without speakers plugged in. Run the sub preamp out to the amp that you will drive the subs with, but don't wire up the subs yet. Test for protect mode kicking in.
Yes - unplug the rca ins from the amp. retest.
No - Problem lies within the sub wiring. What is the load on the amp (measure with an ohm meter)? If it is below 4ohms, chances are the amp can't dip that low. Give it more resistance by wiring it differently (series vs. parallel)


May 05, 2011 | Kicker Car Amplifiers

1 Answer

My protect light is stuck on and all my wiring is correct so i wanna know couuld this problem be dixed

it sounds like you have a shorted wire or a blown speaker in system

try disconnecting all speakers and see if light goes out if so it is bad speaker if not try disconnecting all speaker wires and see if light goes out then

also if disconnecting speakers fixes problem you might want to check what the Ohm load is and how you have multiple speakers hooked up if Ohm load is too high or low you will get same light

is it possible you have too much moisture in car - sometimnes that will cause error

if this does not help please contact me with as many details as you can give me and i can try to help more - number of speakers, how they are wired to amp, what amp, how many channels for amp, etc - the more info the better i can help

good luck!

Mar 25, 2011 | Power Acoustik Car Amplifiers

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Wiring Speaker to amp

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Jun 10, 2009 | Car Amplifiers

1 Answer

Hello, I have a 2000 VW passat with a Monsoon radio system. How do you install a new head unit and speakers while maintaining the factory amp? If this is impossible, Can I use the current speaker wires...

Hello ctr1russo,
While it's not impossible to install a new head unit and speakers and leave the factory amp, it'll be a real bear of an install.
In order to work, the Monsoon amp needs 6v which is provided on the speaker leads. An aftermarket head unit will not provide that. Best to just install a new amp.
You should be able to use the wiring, including the speaker wiring, with no problems.
Check out for the appropriate adapters and wiring harness for Monsoon equipped vehicles. Just enter your vehicle info and it should bring up the required adapters and harnesses to make everything work properly.
There are three ways to connect more than one speaker to a single channel: 1) Parallel - both speaker +'s and -'s wired together - load impedance will be halved (2 4-ohm speakers in parallel equal a 2-ohm load). 2) Series - The + of one speaker wired to the - on the other speaker and the remaining + and - going to the channel output - load impedance will be doubled (2 4-ohm speakers wired in series equal an 8-ohm load). 3) Using a crossover - connect the bass speaker (woofer) and the input of a high-pass filter directly to the channel output and the treble (tweeter) speaker to the output side of the filter. In any of these connections, you want to make sure that the load (ohms) your amp "sees" is not less than it is rated for. Most amps will work into a 4-ohm or a 2-ohm load with no problems. Going below 2-ohms is bad, because it will cause the amp to overheat and possible fail. Going above 4-ohms is no problem for the amp, but it won't produce as much power (watts) at the higher impedance and your speakers will not be as loud as they could be.
Hope this helps. If it does, please rate as "FixYa:. Thanks!

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1 Answer

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1st I would test the speakers - find the amp under the back seat, then test which wires go to the front speakers and use a AA battery to check if the speaker pops with those two wires and the battery.  If it does pop, its your amp needing replaced.  You can switch out that infinity amp for an aftermarket one very easy. Just use a testlight, or voltmeter to test the wires, and switch them to a new 4-channel amp.  
if you need the wiring diagram, let me know...and dont forget to rate me! or ask for more help!

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1 Answer

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Whether you should run them series or parallel depends on the ohms of the speakers and the rating of the amp. If the amp rating is 2 ohms and the speaker are 4 each, then you can run parallel. When you connect speakers in parallel, the total impedance (ohms) is calculated by dividing the impedance of one speaker by the number of speakers, assuming they're all the same. When in series, add the speaker impedances together (i.e. 2 speakers 4 ohms each=8 ohms) Going over the amp rating doesn't hurt anything but the level of sound, but when you go below it, you'll eventually burn out the amp.

Hope this helps, and please rate my advice.
Thank you, and good luck!!

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The woofer or the wiring may be shorted. Remove the speaker wires from the terminals of the amp and power up the amp. If it powers up, check the wiring and the speaker. If it still goes into protect, the amp may be defective. A short in the wiring or speaker can damage a brand new amp.

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