XLR to RCA Adapters

It is indeed! Did you get a chance to check the bandwidth at 10Hz and 5 Hz also?

I just ran an existing scripted procedure on the M-2, and it started at 20Hz. The Gen-Mon results I did manually, but I neglected to change the LF end of the sweep. And the System One only goes down to 10Hz . . . for subsonic results I have to use a function generator, then measure with a 'scope . . . big pain. THD results are even tougher; I need to use a DSO sync'd to the generator to acquire the waveform, average 64x to reduce noise, perform an FFT with a rectangular window sized to the exact generator frequency, then calculate the THD from the sum of the harmonics. Ugh.

Jensen's datasheets are probably more accurate at subsonic frequencies than my measurements . . . Deane Jensen was actually a pioneer in many of the techniques used to acheive accurate results in this region.

Hi Talk2me . . . Al managed to find much more information about your amp than I did, and his advice is spot-on as always. If the Burmester amp indeed only has a balanced input with a 2K input impedance, then there's a chance it's only a 1K impedance with their adapter, depending on the design of the input stage. It'd be a good idea to get Burmester's recommendation, and verify with the preamp manufacturer that it's comfortable driving a 1K-2K load.

Another transformer manufacturer that deserves recommendation is Lundahl, and the owner Per Lundahl has been very responsive to technical inquires in years past. They manufacture some input transformers that can be configured in many different ways . . . some configurations could work well for a small step-down ratio to a lower-impedance input such as the one on your amp, and present a less demanding load to the preamp. I think his offerings in pre-packaged plug-in solutions may be a bit more limited, but definately worth checking into.

Kirkus, yes that does sound like a pain.

I've always been a fan of bandwidth, well below 20Hz and well above 20KHz to maintain proper phase reproduction in the audio passband. Both areas can be hard for transformers (which is why I prefer to direct-couple) and is why I usually look into the loading issue if transformers are to by used; its all about out-of-band extension.