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Bandmaster head volume is low and distorted - Audio & Video Receivers

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Hi Joanne

Check that you do not have a faulty quaddy or speaker lead first. by plugging the head into another box. If it is distorted on another rig, then you have a fault in the head. This can be a number of things, least to say that it will need some electronic repair work done to it. I suggest you take it to a guitar amp repair doood for a look. Sorry I cant actually fix it for you in the medium, but is will need some expert attention, so advice is all I can do.,

regards
Robotek

Posted on May 02, 2008

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At low volume it is fine after you get to about 20 on the volume it starts to crack,pop and distort very bad what is making this happen


Your speakers may say 350 watts but that is the peak wattage at which they blow up and not a wattage they can sound distortion free at. Look for the RMS wattage which is probably around 40 watts. If you look at the specs on your receiver you will see it will put out a maximum of about 50 watts but the distortion on the receiver is above 1 percent at anything over 22 watts. That means they are going to start distorting at around half volume. The other thing you might check for is a impedance mismatch between the speakers and the receiver. Is the receiver set up for an impedence output of 8 ohms but your speakers are 4 ohms impedance.

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what kind of speakers do you have hooked up? make sure your cables from the speakers are good. you should have an RCA type hookup on your record player, make sure they are in there good too

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When I use my headphone jack on my Casio WK 3500, if I turn the volume up past a certain (very low) point, the sound is distorted. Can you tell me what might be the problem and how I might fix it?


There are two devices involved and you've only defined one.

What are you feeding the headphone jack TO?

Maybe it's the headphones (?) themselves that are distorting.

Wild guess... if you're plugging the output into "PHONO" on something it WILL distort above a very low level. "PHONO" is the only input in audio that is literal and exclusive. Turntables ONLY.

Use another input.

Google "RIAA equalization" for further info on that subject.

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1 Answer

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If you have checked the speakers and wiring, the right channel has a audio driver or output problem, which explains the low volume, static, and distortion. A service technician will be required to fix the receiver so it will balance the left side.

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1 Answer

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Your volume levels and effective impedance becoming too low can lead to a receiver self-protecting. It's trying to tell you something and will eventually die completely if you don't address the cause.

We would need more details regarding models and exact configurations. Keep in mind that an amp driven to distortion is very dangerous to itself and the attached speakers as distortion lacks the smooth sinusoidal transitions that normal audio has. Square waves or briefs burst of DC will take a toll eventually.

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Possibly one of the power transisitors has gone out. They are typically used in pairs, and if one went out, this is likely what you would experience.

Open the unit and look for the power transistors. The have 3 leads and should be connected directly to a heat sync. If one burnt out, it will likely be obvious by just looking at it. Power transistors are cheap (>$10) and there are many online sources to by them from. With a litle soldering skill, shouldn't be too bad.

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try to change the center speaker.
if the distortion happens when you rotates the volume control . clean the volume control using isopropile alchohal or any head cleaning solution.,

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I been replied you in chat thread, please check and feel free to ask any question.

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