Rerurn to Romy the Cat's Site

drdna wrote:

I have found the next obvious glaring problem, which is contributing to the muddy sound I described earlier.  There is a mismatch between the two channels.  The right channel is very slightly softer than the left with a very slight change in the sound like it is vaguely from an old-fashioned radio, but very subtle.  I tested this by listening with a mono signal to each channel one at a time.  I can tell this from anywhere I stand, far away or with my ear right next to the speakers (so I do not think this is a room acoustics effect). I found that the same signal from the same RCA output on the preamplifier through the same wire would make this different sound going to the right amplifier and speaker than going to the left amplifier and speaker. So I switched the amplifiers and there was no difference. Then I switched the speaker cable and there was no difference. Then I switched the speakers and there was still no difference. Then I became very confused and decided to see if you have any sugestions?

The line level devised usesly more or less stable and mostly likely the deviation of gain in power amplifier usesly the problems. Another common problem is that the crossovers in right and the left channel are not bult identically…. Still you clamed that you switched speakers and amplifiers and did not detect any differents… Well, if I would knot how exactly the problem of “softness” manifest itself perhaps I might suggest something. Meanwhile, I have seen before how the specific magnetic fields might quite adhesively after what speakers do. I do not know the EdgarHorns crossover. I do not think they should be “serious” and I doubt that he tune then individually for each driver type. Still in his upper bass horn he most likely used a coil to low pass the channel. Most likely he use a second order with tweeter, which would demand coils. The make the EdgarHorns having 4 coils (+ MF and HF voice coils). During the operation of the drivers, and particularly of the air core coils were use in crossovers and if the speaker sit in a magnetic filed, the inductance of the drivers, coils talks to each other and produce quite auditable results…. Do not forget that you are in high sensitively work and with 110dB you have why should be able to pick your local AM station on your coils if you position them properly….

A few years ago I use 3 and something Henrys air-core coil made up with… 8ga wire. It was a barrel of cupper that acted like a sponge for any airborne dirt. I have in one side of my room (what right speaker lives) something that I called “Area 51”. At tie location (approximately 3’x3’) any coil suck in EMI from air with a force of a mid size back hole. If I positioned the coil in there then by changing the angle of the coil I was able to change sound quite tangibly. I did not measure the Gausses in there but I know what was going on and I ended up building sarcophagus for the right speakers crossover. I used CO-NETIC alloys for that reportedly has magnetic shielding 800 times stronger then steal of the same thickens. It worked very nice with exception that all of those Magnetic Shield Corporation’s products are quite expansive…

Well, something suggests me that you might have the very same problem. In fact may people with high sensitively drivers have then but not a lot of them have ability to understand or detect it as thier noisy and dirtily electronics mask out the effect of environmental magnetic influence…

Rgs,
The caT

Rerurn to Romy the Cat's Site