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Didn't you guys play around with the Virtue amps and battery versus MajikBuss/SMPS at RMAF?
Thank you guys for the precious information.
So, are you buyin' one?
Well, the main doubt was the effectiveness of the BUSS with class D amplifications.So I think I'll but one, but the decision is not yet taken.
Hi Dave I am looking at the switching amps using the ICE modules. I have been looking for specific information on your Buss products and don't seem to see any. As far as PF correction- Do the ICE modules have built in PFC. Most switching supplies do have this built in to help with meeting regulatory requirements. The power requirements of a class D amp are much less then an equally powerful Class AB amp. This and the fact that the switching supplies can work over a large voltage range should make them less sensitive to poorly regulated power. The unknown of course is how the switching noise from the amp will impact on the incoming power and what this will do to the front end components in the system. It seems to me that the class D amp would require a different solution than conventional amps and that isolation between the amp and the rest of the system/power line would be a critical component of any power treatment. I my own situation I am 3 miles from the main road and have a dedicated transformer on the pole at the end of my driveway. It is 250ft to the house and even with a dedicated TX my regulation is poor with the voltage sagging to below 110v in winter when electric heat is in wide use(Canada). I think the classD amps may have an advantage in that the supply can operate down to 90v and still provide rated output. What are your thoughts on this and how does the Buss isolate without using any series filter elements?ThanksBrian
Dave I don't need to know specifically how the Buss works. I am just trying to get a feel for what is going on to reduce EMI and isolate. So the Buss reduces noise by lowering the power line impedance at the offending frequencies. So there would be no isolation between the outlets but all outlets would have lower noise? How much power does the Buss draw when there is no load? I have heard transformer buzz caused by small amounts of DC offset. This is a concern with toroids in particular. The Bryston company has schematics of their amps online. If you look at the schematics there is a circuit used that prevents DC offsets using large electrolytic caps and diodes. This is a product that should be commonly available and perhaps included in power treatment solutions. It is not exotic or expensive to implement. Brian
Hi Dave Glad to hear there is a hum solution in the works. I traced my hum problem to a toaster oven of all things. It appeared to use a half wave rectified heating element that caused only a small DC offset in the AC as measured with a Fluke 189 true rms meter. But this was enough to cause audible hum from all the toroids in my Rotel electronics. Disposed of that problem real fast. A short story about generic power conditioners. I have a monster conditioner power strip. It is the 2000model with the High Current unswitched outlets for amplifiers. I recently replaced the switching supply in my DAC with a linear one. In order to cut heat in the regulator I had included a series resistor in the rectifier circuit of the +5v logic supply. There still seemed to be plenty of headroom for the regulator. When I powered the DAC up everything was fine. The DAC was plugged into one of the monster isolated low current outlets. When I turned on the power amp, a rotel 990 with 60,000uf and a large toroid, the DAC reset indicating that the power supply had fallen far enough for the supply to loose regulation. It seemed the high current outlets still had considerable voltage drop. I let the amp sit for a few minutes than plugged it directly into the same duplex outlet as the monster conditioner. Turning the amp on did not cause the DAC to reset, proving that the voltage drop was in the "High Current" conditioner. I repeated this several times and results were consistent. Since then I have run my amp off a separate circuit and have increased the headroom in the DAC supply. I notice better slam and dynamics since then. Sorry for rambling but your point about current limiting is well proven by my experience.Brian