Last year I decided to upgrade my system. It is almost 50 years old. First, I replaced my ERA 555 turntable with a Rega P8, Rega MC cartridges and Rega MC Fono amp, a significant improvement. Second, I have replaced my Quad 303 power amplifier with a March Audio P452, another significant improvement. I have added a Rel T5i to support some moderate bookshelf speakers and this, too, is a step forward. I am looking for a replacement for the Quad 33 pre-amp, a present noise source, but the replacement presents many options that simply didn’t exist for my original setup. This brings me to the subject of room equalisation.
Conceptually, it seems quite straight forward: pump a known set of signals through your system; measure them with a calibrated microphone; create a profile that adjusts the sound output so it is more linear. As an aside, my other passion is photography, and this is practically the same process used for calibrating colour printers, just that it is applied to the visual part of the spectrum.
The practicalities for sound is that my main sources are analogue (Rega P8 and NAD CD player). To “process” the signals from these for room equalisation, the analog signals need to be converted to digital, processed, then converted back to analog for amplification and distribution to speakers.
By many accounts, one of the best investments in sound experience is digitally profiling your system and, conceptually from my printing experience I really like the idea. My concern is, does the ADC - DAC process introduce noise that Alan has done so much to eliminate from the P452?
If, however, the ADC - DAC process has no effect, then a product like the MiniDSP SHD, could be an interesting possibility as a pre amp substitute.
Being new to all this, and the distinct possibility of having completely misunderstood the room equalisation concept, I welcome comments and advice on next steps for improving my system.