[quote name='alexclaber' post='556304' date='Jul 30 2009, 04:30 PM']A DSP is a digital signal processor. The Berg IP has one of these built into the onboard power amp, which provides EQ, filtering, compression and limiting to make the cab sound much louder and deeper than you'd expect from something of its size. The XTi amps have a DSP built in and you can download patches for them to you computer and then load them onto the amp via USB, so if you're using them to drive a JBL PA speaker system you can get those patches from JBL's website.
Now obviously my cabs are already designed to go stupidly loud for their size, and even more comically loud for their weight, so they don't really need DSP to help. But if it's available then why not use it? So I can do two patches for each cab, one which provides simple highpass filtering, compression and limiting (highpass filter removes all unwanted energy below the tuning frequency to minimise wasted power and excursion, compressor would only kick in once the cab/amp are reaching their limits, and then limiter to kick in after that), and a second patch which also adds EQ to flatten and extend the response in the lows and smooth out response in the mids and highs (in addition to highpass filtering, compression and limiting).
Alex[/quote]
I was with you all the way up to 'A DSP...'
No, that all makes sense, cheers!