Question about Phonic MAX 2500 Amplifier

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Why is my speaker not working to full capacity

One speaker is working fine the other has some sound no bass. I have switched leads so it's not a speak or lead problem. How do I fix or can it be fixed?

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Hello, First, check the bridge switch located on the rear of the amplifier, should be on STEREO position, GROUND switch to GROUNDED position, check front potentiometer for dirt or scratchy sound as turned it up or down, if none of this solve your issue then could be an internal defective speaker output relay, or channel fuses, let me know if you need further assistance, Regards.

Posted on May 14, 2014

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There could be oxidation build up on the mono/stereo/parallel switch. Turn the unit off and move the switch repeatedly through all three setting a few times...if this brings back your sound level, purchase an electronics contact cleaner and spray the switch...then again...move it repeatedly to help "wipe" the oxidation off the switch contacts.

Posted on May 11, 2014

  • Craig Popovich May 11, 2014

    There could be oxidation build up on the mono/stereo/parallel switch. Turn the unit off and move the switch repeatedly through all three setting a few times...if this brings back your sound level, purchase an electronics contact cleaner and spray the switch...then again...move it repeatedly to help "wipe" the oxidation off the switch contacts.

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Behind the amp you have the mode switches try to play with them. Then if it not work try to play with the cable or even switch the cable. Good luck.

Posted on May 10, 2014

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2 Answers

Need Parts OR need to fix !!!



Open up your computer
the speakers plug/outlet is usually at the back of the computer

to check the lead attached to the rear of the input plug make sure the connection is good

or you might have to clean the dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the CPU central processing unit and your sound card dust causes static to build up in a computer causing it to overheat any many other problems

hope this helps you

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I have just bought Logitech Z623 Speakers and connected with my computer. All Speakers work fine upto certain Volume and Bass level but One of the satellite Speaker ( Mostly Speaker with Volume/Bass...


try swapping the speakers around if the problem still persists either the speaker is faulty or
the speakers plug/outlet is usually at the back of the computer you will have to open up the computer to check the lead attached to the rear of the input plug make sure the connection is good
or you might have to clean the dust from your computer dust causes static which causes your computer to overheat and all sorts of problems
be sure to wear an anti static earth strap before touching anything inside your computer try cleaning your computer of dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the CPU central processing unit and your SOUND CARD dust causes static to build up in a computer causing it to overheat any many other problems
other than that you might have a warranty issue
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I have Mercury 2.1 white speaker.It works fine for half an hour but after that the woofer's sound stops-start frequently at highest bass but when I reduce the bass It works normally with no distortion.


If highest bass means you are boosting the bass for effect then it may be some form of speaker protection cutting in.
The most likely is a Polyswitch, which increases in resistance as it heats up when too much current is going to the speakers. The sound resumes when it has cooled down.

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Hi... When I adjust my radios balance to full right or full left, it gives far stronger bass then it would if the balance were dead center.... When it is centered, there is very little bass......and music...


speakers are "out of phase", meaning that one side is wired correctly and the other side is not. the easiest way to fix this is to just switch the wires on one side, by "switching" the wires i mean the positive and negative wires on the speakers/box? hope this helps, dave

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I own a 1992 Silver City MSN jukebox. I have checked the crossovers and polarity of the woofers. Found 1 speaker to be out of phase. Crossover fine. Better bass, but still weak..How can I increase the bass...


instead of hacking your unit, frankly speaking buy a new one if you want to increase the bass, its circuit is design only to produce that amount of bass sound. the sound it produces depends on how much power its audio amplifier has and how much its powers supply have.

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Can't get wharfedale melton 2 tweeter to work. Looked inside cabinet and need advice on internal wiring please. These are very old, but one works perfectly and the 12'' bass driver on the problem speaker...


All the electronic parts you can see inside the speaker (usually capacitors, coils and resistors) are responsible for breaking the full audio band (bass - middle - treble) in parts (2 for your case) and feed each part to the appropriate speaker. By that I mean that you must not use your speaker without the cross-over (this is the name of the circuit) since this can harm your speakers. The sound from a speaker without crossover will be terrible for your ears too. Eventhually you can try to connect your tweeterat the amplifier's output leads, assuming that the volume level will be very low. Using this connection you can just check if the tweeter is working ok or not, so you can find where is the problem. By the way I don't think that a coil is burned out, try to see some resistor possible burned out.

In case of a problem or clarification, don't hesitate to post.

Thanks and regards
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1 Answer

Subwoofer not working


Yea I would say most likely a loose wire going to the bass control, is it accessable to behind the controller easily? if so take a look. they are usually soldered, but it may have been a weak solder point that came loose.

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1 Answer

Bass speaker start up noise


Hello anne845,

It sounds like the installer wired the amp remote turn-on terminal to an "accessory" lead in your vehicle. Many stock radios do not have a dedicated amp turn-or lead and the alternative is to connect the amp to a switched power source (ignition or accessory). This means the amp turns on whenever you turn on the vehicle ignition, often resulting in a thumping from the subs. It is a perfectly satisfactory alternative, and will not damage either the amp or the sub. But it's irritating.

If the thumping is objectionable, have your installer wire a SPST (Single Pole, Single Throw) toggle switch inline with the turn-on wire. The switch should be mounted so it is accessible by the driver, and whenever you turn on the radio, turn on the toggle switch.

Hope this helps.

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Center Speaker Audio Very Distorted


Love your screen name.

You didn't say what, if anything, preceded the appearance of the problem. There might be a clue.

Can you describe the distortion? Is it excessively bassy? If so, is it happening on all sources?

I'm assuming this is a modern digital receiver that is capable of many soundfield simulations as well as native Dolby Digital, DTS, multi-channel. If so we can use a stereo source and through simulation redirect some of it to the center speaker.

Using one of your receiver's many multi-channel simulation modes, put in a CD or tune an FM station and use it to diagnose the problem during later steps.

If it's only a single source and that source uses individual analog channel RCA cables, swap in another one or temporarily move the Center Channel feed to one of the other channels to see if it's before the receiver (in the source).or inside the receiver.

For multiple sources:

Is your Center speaker defined properly as Large or Small in the receiver's setup menu?The size refers mostly to the bass-handling capacities of all your speakers rather than their physical size. Speakers designated as 'Small' will not be sent much in the way of bass because they can't handle it well. The LFE/subwoofer channel(s) will get all the bass that was intended for them instead.

If you have a Small speaker improperly defined as Large it may be getting bass that it can't handle and that might sound like distortion. Having a Large speaker defiend as Small would result in less bass than expected but otherwise 'clean' sound.

Check the speaker setup in the menu for excessive volume level relative to the others. There is usually a calibration procedure the receiver will use to help you adjust the subjective voume of each speaker using white noise or tones.

Hope this helps.

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