Thanks John. I appreciate it.Fabulous product Tom.
That's pretty neat. And thanks again for your recommendation of the XLR-to-3.5/4.4/6.3 mm adapters.In case someone wonders about the differently looking front plate of the HP load in the above linked video: The unit has a lot of extra space inside and is quite easy to modify. So I [...]
Yeah. That's the only real annoyance I have with the APx software. If you want one graph that shows THD+N vs output power for multiple load resistances you basically need to record THD+N vs output voltage for the different resistances and massage the data in Excel after.My experience with the AP remote was less stellar, but that is not caused by the HP Load. The AP software has some unexpected restrictions. For example when doing a THD+N sweep versus level you can not set a THD+N max value where the sweep would stop - for example 1%. You are into clipping then and don't want to see crazy lines going up. Multiple impedance sweeps that have the X axis in Watts are cumbersome to do (that's why you don't see them on ASR). Automation of this all quickly lets you do it manually again to get nice looking graphs.
It's in production testing of headphone amps where the automation feature of the HP-LOAD really shines. I run all my amps through a script where the THD+N vs output power is verified for various load resistances. The script collects several other data points as function of load resistance as well. It's very handy to be able to click a button and come back 15 minutes later to a fully tested amp and a test report with a bunch of green checkmarks. This saves a lot of time and prevents many errors. In the past I used clip leads on a resistor bank and would have the APx software prompt me to swap the leads around. That got old real fast!
Tom