Recent content by bamtron

Have you checked connections at the back of the amp?

I am, of course, talking about path differences of room reflections. If, say, rear wall reflections are causing the null, then moving the microphone towards the speakers shortens the direct signal path, and lengthens the reflected path.

Easiest way to prove if room problem is to move the listening position microphone 2 feet toward the speakers. This will change the path length, which would change the frequency of the null. If the frequency doesn't move, then the problem is not the room.

Most people don't understand distortion. THD (total harmonic distortion) is generated by non - linearity in semiconductors, and is reduced by the "negative feedback" circuitry. The products are new output signals at a multiple of the input. For example, 0.2% distortion is 0.2 Watts output of...

0.2% distortion is not what I would call "HIFI". back in the late 90's through to 2012 I had a few amplifiers in an active crossover system each of which had 0.002% THD and IMD specs of 0.005% the bass amps at 350W per channel into 4 ohms, the mids at 220W per channel and the highs 150W per...

Haven't seen a Marantz amp for a long time, which probably means they are fairly reliable.... Bamtron

I have quite a few very thick, expensive reference books regarding the above topics - thermal stress and fatigue, mean time to failure and etc., so a brief answer will not be a complete answer. However, just briefly, if you switch off your equipment at the mains when you aren't going to use it...

Yes - remove the mains power from your equipment when you are not going to use it for a few hours. The "standby" circuit (that the remote control activates to turn on/off the equipment) is very often the section that dies - it is running 24/7. Removing the mains power can mean the difference...

From an old electronics tech: have observed the phenomenon in old Mosfet analogue amps - it's caused by old power supply capacitors which have high internal resistance. This causes the voltage to drop and ripple voltage to be higher when cold. Makes the sound "fuzzy" and dull. Faulty capacitors...