Pro Audio Design Forum

I have often wondered about constant-current drive for phones. We used it driving spring reverb transducers at MicMix. WRT Ro some common values are 32 and 63 Ohms. I've seen ranges from 10-200 Ohms. There may be one model at 300R. AKG re-designed the "most-highest" AKG-240 which was 500-6...

JR's the expert but my vote would be to back-ground.

This is something I've wanted to try for along time just to see if I could. I wasn't sure if it had ever been done. Drive the shield with mono, and tip and ring with difference. This de-matrixes the Mid Side/Sum Difference in the transducer wiring and can be used with conventional 1/4" or 3.5 ...

Better is always better,,, Driving magnetic systems like transformers IIRC benefit from lower source impedance, perhaps a transducer's magnetic system also benefits. My distortion overlay is not completely fair, as some distortions are more audible than others... I recall hearing modest amounts of ...

Not to be more contrarian than usual he is talking about distortion spurs down at -70dB.. for chuckles how about a distortion overlay for the transducer? Ah, there's the rub... He does admit that acoustic measurements may show more distortion... All measurements shown in this paper are taken at the...

Sorry I didn't read the links I ASSume these measurements are of the voltage driving the cans, and ignoring the transfer function of the headphone transducers? Yes. Crosstalk at -60dB for stereo program is not a big deal. A 1/2 dB rise is barely audible in the midrange, and surely inaudible at freq...

And the winner is: No Build-Out. I recently updated the headphone amplifier post I did at DIY Audio that's based on the THAT1646 with current boost transistors. People over there were wanting to use the DRV134 and it requires a simple mod. One of the forum members asked about removing the build-out...

I never got into circuit simulation... back in the early days it wasn't that reliable.

Jensen Comtran? John - Did you ever have the hardware to run that?

samsagaz:

I don't know why they haven't provided a model of the 1570 yet.

It's certainly not here: http://www.thatcorp.com/Device_Models.shtml

I'm going to be ordering some common mode chokes in the 1-3 mH range from Mouser today and will look at those for mic input applications. I did run some pulsed RF (LF square wave AM modulation of sine at 100%) tests using a combination of the 94 uH/leg CM choke, 1K dampers, 270 pF/leg with a cross-c...

We're all seeing the ads for people wanting to buy our gold.

This one, for vinyl, recently came in the mail and caught my eye.



You're gonna have to pry my old King Crimson and Yes albums from my cold, dead, hands.