In all the talk about amps and cabs. I've noticed that many of you hate the fact that amps are so heavy. Makes senses if you're the one lugging it to gigs. I've been spending many hours building a variety of power amps focused only on bass guitar. There are many reasons why I did this. One is that I've always been interested in electroincs so to pay about 3 grand here for something I can build very easily for $700 bucks means more money for a better bass. Better power amp too in some cases. The other reasons could be that most of the bass power amps are not as grunty as they could be. I know that sounds very bold but I mean that in terms of sound, not volume. I have just finished a 2 channel power amp that has the following specs but it is very heavy and the build is quite intense for the jo blow. (Safety issues etc) 2 x 850W RMS @ 4 ohms, 450W @ 8ohms and damping factor greater than 300 when operated 8 phms. In has bal/unbal input, input sensitivity control and soft start etc. All the usual requirements for a nice bass amp. Under $1000 in parts. The main factor in building this amp was sound by means of headroom. Huge grunt turned down low sounds great. As this forum has had many posts about equipment weight it reminded me of a amplifier that I was looking at before I built this one. It was a digital class D type but at that time had a few criteria that didn't suite the bass amp. Mainly ability to bridge or operate in stereo with flexability etc. The same group here in Australia now has one or two that will do this. In fact the specs are incredible. This amp would be, Single channel 750W RMS @ 8 1400W RMS @ 4 Weight would be very very light. And it's light. The transformer is the only heavy item in the whole amp. And it's even much smaller than the norm As this exact amp is about 96% effiecient as compared to the average class a,b being half that, there is almost no waste, no heat and they are now very low distortion. Are in the hifi grade for sure. Very robust. This amp has great damping factor specs, and can also be built with less power by only changing the transformer spec. The amp modules are the same. The above power rating would be the maximum safe continous operating. This amp can be built for around the $900-1000AUS so about $750 US for our friends in the US. Imagine picking it up and it only weighs about 8lbs. But it makes 1400W RMS. When you see the indside of the amp you will say NO WAY. I said the same. It's so simple. If any of you guys are interested, I was thinking it could be an DIY amp for people here that wish to build their own. It isn't about profit. Just aiding each other to build and improve this item. Eveyone involved chips in, and it makes it very easy for all. If you guys are interested please post a reply and I will go to the trouble of gathering all the information and post it here so you can read up for yourself. So far I can't see anything negative about this design and it's application as a great bass amp. I will be building one as soon as possible and would like to get some feedback from some players on their thoughts of its performance. The build of these amps is extremley simply. In fact with a kit form you could assemble it in a few hours.