INFINITY 7541A PDF

Dear All, Please I am new in the forum and need some advice to find out the problem. I have a problem with a Infinity a amplifier, it is a used one and I have connected to the speakers and headunit without any problem. The amplifier could start and all 4 channel work without any problem of going into protect or anything. Problem is, I discover that all 4 of the channel produce some high frequency distortion or noise may be, when music playing in low volume and in particular frequency. Before I asking expert for help, I have tried to see if there are anything I could do 'Externally' for the amp, I have tried to check if there are anything went wrong for the installation, and search though the forum and internet so as to diagnostic the problem, so far I have tried, and the the symptom of it are: The amp will produce the noise When the both the Engine either on or off, so it is not the alternator whine, so I assume that is not the interference from the power. I tried to use a Disc man to connect to the RCA input of the amplifier, it also have the noise in all 4 channel, BUT not as much as the Pioneer produce!

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Dear All, Please I am new in the forum and need some advice to find out the problem. I have a problem with a Infinity a amplifier, it is a used one and I have connected to the speakers and headunit without any problem. The amplifier could start and all 4 channel work without any problem of going into protect or anything.

Problem is, I discover that all 4 of the channel produce some high frequency distortion or noise may be, when music playing in low volume and in particular frequency. Before I asking expert for help, I have tried to see if there are anything I could do 'Externally' for the amp, I have tried to check if there are anything went wrong for the installation, and search though the forum and internet so as to diagnostic the problem, so far I have tried, and the the symptom of it are: The amp will produce the noise When the both the Engine either on or off, so it is not the alternator whine, so I assume that is not the interference from the power.

I tried to use a Disc man to connect to the RCA input of the amplifier, it also have the noise in all 4 channel, BUT not as much as the Pioneer produce! Tried another pair of RCA and use the Dicsman as a signal source, again, it doing the same! Check the Peco fuse of the Pioneer as I found on the net that it is a comment issue , by using multimeter to check the grounding of the RCA s of the HU, they all connected to the HU chassis ground, so I assume that it is normal.

Then tried to connect the chassis ground of the Pioneer HU to the power ground I know that is wrong! Tried to ground the RCA in the amplifier side to the power ground, again Wrong! Use a multi meter to measure the resistance between the RCA to the Amplifier chassis ground and found that is not connected, so I tried to connected all RCA together then connect to the amplifier chassis ground, again, doesn't help After that, tried the amplifier side, I have tried to connect all RCA ground together, but not connected to the chassis ground, no hope Swap the front and rear channel RCA and see if all channel doing the same, and found that all 4 channel having the same problem!!!

SO, after all the test above, I assume it is the problem of the Amplifier itself, but I believe it is not related to the signal input stage or amplifier output stage, as if any channel got problem, they will behave differently, in my case, they all the same! I am not sure if it is the problem of the grounding inside the amplifier or the internal power supply?!

If we going back to the point 11 above, should the RCA s ground of the amp input connected to the amp chassis ground internally??!! Any other suggestions I could try Externally for the amp???! Will that be a problem about the matching between the Pioneer and the Infinity?? Thanks for any help in advance! Hi regarding point not all amplifiers connect the RCA GND signal to Chassis GND, some most of the times higher value amps use some isolator-amplifiers to surpress engine noise entering the pre-amplifiers I know some Alpine, Philips and Kenwood amps do It sounds like the amplifier itself needs to be checked thoroghly , I dont know the model myself and I dont have a schematic for this particular amp but I know from the past that solder joints are pretty bad thing throughout all price-ranges of amplifiers.

So I usually re-sodler all circuit borads before I start checking for defective parts. So if this was an oldr amp , maybe you wanna open your unit and check the board s thoroughly use a magnifying glass if you have one for bad solder joints. Another thing that sometimes happens is that the GND line of the cheaper-type RCA inputs just brakes or has very bad contact. Hi, Firstly, Thanks for your reply, I have the similar idea! I have found myself the schematic diagram as well, so hopefully will be able to have it open and diagnostic the problem.

If you decide to open the amp, first look for obvious problems. Find More Posts by Perry Babin. Hi, Thanks for your information, and I will try to have it open today and start the visual inception first, then probably will check the power supply stage first, will update if I could possibly find anything!

I have manage to get the amp out of the car and have it open and test, apparently can't see any thing went wrong, the nothing burns inside, and I have check the capacitors and resistor which connected to the floating ground, and also have check the RCA grounding from the input, they all fine Tried to poke the signal into the power amp stage, the resistor R on the board which bypass the preamp and crossover, but still, can't see what went wrong Finally have check the voltage which feed into the crossover board, and look look to me, it measure around Please are there any suggestion for what I should check next if it still here???

Hi, I still not able to find out the problem , are there any suggestion? Did you have both positive and negative supply voltage on the op-amps? Did you have both positive and negative rail voltage on the output transistors? Yes, both positive and negative have nearly 15 v which read approximately But I can't get the output transistor rail voltage, which particular point should I look at?

Hi, I have got the Voltage measurement: In my test bed and when the battery is BB code is On. Smilies are On. Forum Rules. All times are GMT. The time now is PM. Resources saved on this page: MySQL User Name. Stay logged in? Mark Forums Read. Please consider donating to help us continue to serve you.

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Infinity Reference Series 7541A - car - amplifier Specs

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Best Price, Infinity Reference 7541a 4-channel car amplifier 111 watts RMS x 4

Estimated wait for next available agent :. For Tech Support, call The heavy-hitting Infinity Reference a 4-channel amp is more than ready to take on your mobile audio needs Can't find your exact vehicle? Please confirm that this adapter will work with the stereo you intend to use. Find products that fit. My name is Ken.

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