Question about Marantz Audio Players & Recorders

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I have a Marantz 2270 receiver and a Marantz 2220B receiver that have the same problem. At about 1/2 volume on either unit with Bass rich music, I get a loud cracking/ popping sound that actually sounds bad for the speakers. I tried both receivers on 3 different sets of speakers and the cracking/ popping noise was quite evident at about 1/2 volume at the bass parts. The pots were cleaned but the noise is still there.

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This kind of problem is logical, if you have the "loudness" control enabled. Well, let me explain the situation. The loudness control is a function that boosts the lower and higher frequencies (the bass and treble) in low volume settings. This is useful because at low volume settings our ears are not so sensible at these frequencies, so the result is nice to hear. This boost (the loudness) stops automatically (at most amplifiers) at volume settings just above the middle of the volume control (to be more specific near the 1 hour setting of the volume knob), that's the point that you get this cracking sound. In case the audio source has plenty of bass frequencies the result is what you hear.
I suggest you to lower the bass boost potentiometer or disable the loudness control when you hear music at these volume levels. A good idea also is to disable the loudness control permanently and boost the bass and treble from the knobs as you wish. This will give you a sound near the original one although at the beginning you will feel the absence of bass (this is because the sound you were listening before has more bass).

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Posted on Mar 19, 2011


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