Sound of signal vs rectifier diodes

[Nick C.]

In my experimenting with clipping diodes in my SD-1 I hear differences between signal diodes (1n4148) and rectifier diodes (1n400x). To me the 1n4000x sound softer and more compressed. This is puzzling to me since their turn on voltages are similar to the 1n4148. There must be something else going on here as to how they clip. Am I imagining this?

Can someone please shed some light?

[R.G.]

Could be the junction capacitance, which is larger in a slower rectifier diode with a bigger chip/junction area.

[MarcoMike]

I've always thought the difference is not only in the threshold voltage, that way all diode should sound the same, provided a "proportionally loud" signal "hits" them....
I guess there must be some kind of impedence factor, like the diode has not the same resistance (and shunting ability) toward diferent frequencies. another factor may be the (correct me if/as I'm wrong) different recovery time of the diode to pass from conducting to not conducting and viceversa.

let's wait for the gurus... (one of which actually posted just at the same time as me..)

[Nick C.]

OK, so it's not my imagination, capacitance, impedance, speed may play a factor. I had a feeling that something more than the turn on voltage was happening.

I have messured the resistance across the diodes and their about the same. My meter measures about 10k, but what that would mean for diode I wouldn't have a clue. BTW LED's measured 40k.