Model Pak frequency Response

[pfsmith0]

As a followup to my threads on THD, DEP parameters, and frequency responses for HD500x amps, microphones, & cabs, i finally completed the THD & frequency response measurements of the model paks. You will find them here, since the 340k file is too big to upload to this forum (?).

 

What I found most interesting was the presence (or absence) of 60/120 cycle hum. It seems in these older models you get the 60 cycle hum whether you want it or not. I indicated which ones were clean and which ones had hum. It would have thought it would have been such an easy thing to add a DEP parameter to adjust these.

[damien_]

Thanks a lot for doing that!

[jandrio]

well done pfsmith0 :)

[duncann]

Great! Thanks.

[Akeron]

So it "seems" the conclusions are:

 

1) The "Hum" parameter is useless, because you get hum anyway

 

2) The Xt\X3 models are the noisiest of all

 

Am I right?

[pfsmith0]

Yes, sort of.

 

1) I didn't find a hum DEP parameter for the Xt/X3 models. 

2) Some of the older models had no hum at all. ALL models with lots of gain had more noise than the rest, regardless if they were old or new.

[bjnette]

Good on you for looking and showing your results. Cheers

[napynap]

Thank you so much for this info!