The Crown Macro Tech series has a DF of about 30,000.
Most tube amps can't get a low Df because of the output transformer being inherently "stuck" at one impedance. There are many tube amps with much more feedback than some solid state designs, but the SS designs I am thinking of still have a higher DF because the devices are an order of magnitude lower in impedance to start with (before feedback).
Depending upon things like the driver's Q and the "alignment" in the box (B3, C4, etc...) the effect of DF can be heard at frequencies where the driver may be operating in an area where it's damping (due to the in box alignment) may be significantly different than the damping *above* that point. For example, the driver at 150 hz. might act like it has a Qts of .7, whereas at the F3 point it may act like a Qts of 1.0 (or higher). (actually the alignment would be said to have the Qts of 1.0 in that case)
So, you might be able to hear a qualitative difference in the "fatness" or "heaviness", or the other way around,"thinness" or 'lean-ness" of the bass depending upon the DF of the amp used.
Of course, if the designer used a zero feedback amp in the design - and thought it sounded "right" putting on an amp with a 30k DF might very well make it sound a bit too thin
and lean...On the other hand, if the designer used a very high DF amp in the design, then with a low DF amp it might sound a bit bloated and fatter than desired...
Might.
_-_-bear
Most tube amps can't get a low Df because of the output transformer being inherently "stuck" at one impedance. There are many tube amps with much more feedback than some solid state designs, but the SS designs I am thinking of still have a higher DF because the devices are an order of magnitude lower in impedance to start with (before feedback).
Depending upon things like the driver's Q and the "alignment" in the box (B3, C4, etc...) the effect of DF can be heard at frequencies where the driver may be operating in an area where it's damping (due to the in box alignment) may be significantly different than the damping *above* that point. For example, the driver at 150 hz. might act like it has a Qts of .7, whereas at the F3 point it may act like a Qts of 1.0 (or higher). (actually the alignment would be said to have the Qts of 1.0 in that case)
So, you might be able to hear a qualitative difference in the "fatness" or "heaviness", or the other way around,"thinness" or 'lean-ness" of the bass depending upon the DF of the amp used.
Of course, if the designer used a zero feedback amp in the design - and thought it sounded "right" putting on an amp with a 30k DF might very well make it sound a bit too thin
and lean...On the other hand, if the designer used a very high DF amp in the design, then with a low DF amp it might sound a bit bloated and fatter than desired...
Might.
_-_-bear