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Amp volume problem

I have a Rockwood Detanator amp that has a problem keeping the volume on one level. It will play fine and all of a suddent it turns up wide open for a few seconds and then goes back to the volume it was set at. Any ideas? It functioned fine for about 2 years. It is a 4 channel amp that I used 2 channels for the mids and highs and 2 channels for the bass.

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Sounds like you have a bad or dirty gain potentiometer. Try turning the gain up and down with the volume at a moderate level. If u hear static, it is possible the potentiometer is bad or dirty. Replace with one of the same value and see if that solves your problem.

Posted on Jul 17, 2008

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Posted on Jan 02, 2017

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How do I install a Rockwood AMP-326 amplifier? I'd like to bridge it.


Rockwood was a very low level brand. Alot of their amps were not brigeable. If bridge able the bridge terminals should be marked (usually the positive of 1 channel and the negative of the other channel). Under no circumstances bridge to less than a 4 ohm load.

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My amp turns on good but after a while of too much bass causes a ugly sound too loud what could it be? Can it be repaired?


If you have over driven the amp by playing it real loud with the bass control turned up, it is very possible that you have toasted the output stages of amp.
Every time you boost a tone control by 3 db you have doubled the output power at that frequency. So if you are "coasting" along at a nominal 75 watts, the moment you boost the bass by 3 db the amp has to put out 150 watts at that low frequency.. Go to +6db and now the poor amp has to kick out 300 watts! And so on.

Rule of thumb - you never use your tone controls at very loud levels. Tone controls are there to compensate for the poor frequency response of the human ear at low volume levels - the Fletcher Munsen effect. At low volumes our hearing with the lows and high frequencies so when you play something at low volume you boost up the bass and treble to compensate for poor hearing. At loud volumes our ears respond properly.

Sep 12, 2015 | Car Audio & Video

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I plug in rockwood detanator VII and it goes to protections mode


Generally if an amp goes straight into protection, the amp is not grounded well enough. Either you should find a new location to ground the amp to or unhook the power wire from the battery, remove the ground wire from the chassis of your vehicle. Strip the paint from the chassis, since it doesn't conduct electricity, and remove any corrosion or copper shielding from the ground connector. reground to a solid metal location Can be grounded to the brace behind the back seat or to the seat belt bolt for best results.
An amp draws a lot of power, there it needs to be grounded well.
Hook back up your power wire to the battery and see if your issue is resolved.

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I have a rockwood Amp-479X, need directions to install


Hello william_pric,

Look on the speaker output terminals to see if there is an indication, usually a line between the positive (+) on one to the negative (-) on the other, with the word "bridged". If the bridging terminals are not indicated, you can always try one of the positives and the other negative. If there's no sound, it must be the other two terminals. Just be careful that you don't short the terminals, and don't crank the volume up without the sub connected. Some amps don't like an infinite load.

For an input to the amp from a stock OEM radio, your best solution is to use a "line out converter", connected to the rear speaker wires. The PAC SNI-45T shown in the link is one such device. This one includes a "remote turn-on" lead for the amp. You could use a cheaper LOC and just run 12V from an accessory lead on the truck. In this case, the amp will turn on and stay on whenever the ignition switch is in the "on" or "accessories" position. If this is objectionable, mount a SPST switch somewhere convenient and wire the turn-on wire through it.

Hope this helps.

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a loose or corroded connection can cause this problem...do not overlook possible loose fuse holder...also look into remote control line...also check speaker line for a loose or shorted connection...a loose connection in any of these locations can cause a spike in the current drawn from the power supply... a bad speaker can play at low volume but short at high volume; if the flex wires from frame to cone on the speaker start to fail, it happens at high volume first, and sounds like a crackle, and gradually becomes present at lower levels; a voice coil can warp at high signal levels, causing it to short intermittently, in addition, you might check the cooling capability of the amp...i don't recall whether you have a fan on this amp...

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