Hmmm, seeing this thread pop up reminded me that I had a MiniDSP question. I'm looking at picking up a unit for myself, and one for my brother. Both for management of a pair of subwoofers each. I've been reading and waffling back and forth between the balanced and unbalanced, and was fairly certain I wanted to go ahead with the balanced model for both, but I wanted to make sure I'm doing this right.
1) My setup will be using the .2 output from an AVR (undecided model, but mid-upper range Denon/Marantz probably) and will be sent to an iNuke 6000 (non-DSP), and then a pair of sealed UXL-18 subs. I will want to apply some form of Linkwitz Transform, and then tweak the final response as required. I haven't measured output voltage, but let's assume I'm using a Marantz 6011, and it will be "adequate". The input sensitivity on the iNuke is 0.82Vrms. The unbalanced MiniDSP outputs 0.9Vrms I think this means that I would be OK using the unbalanced version, but is there any reason not to go with the balanced version, to take advantage of the higher 4Vrms output? Will this make the load easier on the amps, or create excessive hum or have some other unforseen issues? Are there any other pros or cons like lower noise that would make one version stand out better in this situation? Should I just go balanced in case I change amps down the road to something less sensitive?
2) My brother's setup uses the .2 output from a Marantz 7009, and his amp is a Crown XLS2502 driving a pair of Ultimax 15s in sealed enclosures. The Crown has an input sensitivity of 1.4Vrms, so I'm fairly certain the balanced model is the better choice in his situation, using the 2Vrms output, is that correct?
I've read about gain structure, and I think the general feelings on input sensitivity is "as long as you have at least that amount you should be fine", but I wanted to make sure. Also, I thought I remembered reading something negative about the balanced model that didn't affect the unbalanced... it might have been noise floor or something, I can't remember. Any input would be appreciated.