Artopsy

Just an update on the tri-amping and the hum. tri amping via 2 PM-600s a TFM-25 and the c-1 through the DBX234 worked great. Although I decided to go back to a single amp, the tfm-25 and the c-1. because it is summer and the three amps were heating up the room, that with combined power usage and the cost of electricity going up. I decided it wasn't worth the slightly added fidelity. The subtle hum was coming from the tape monitor cable between pre amp 1 (Yamaha) and pre-amp 2 (Kenwood) on a separate paired amp and preamp setup. gone now

hmmmm now the hum is gone, i think. it is very soft and not affected by volume control

First off that is the cleanest CS-a700 manual I have seen yet! thanks So I did the tri amping of the home brew speakers. took me some time, I decided to rewire it internals on the speakers for better connections. Once that was done. Its the c-1 to the DBX234s (TRS jacks) DBX234 low to PM-600 #1 Mids to PM-600 #2 highs to TFM-25 Sounds good, whole lot of dials to fiddle with now!! I may move the TFM to the bass, for two reasons 1 there is a bit more wattage on the tfm-25 over the PM600s 2 the pm-600s have the ability to adjust gain where the TFM does not When I did this before there was a slight hum in the system i really thought my dbx had an issue. Individually the three amps and their pre amps had no hum. This time I plugged the C-1, the dbx234s, the tfm-25 PM-600 #1 and PM-600#2 all into one power strip with nothing else in the strip. the power strip is plugged into a power conditioner. So between the aligned power or the rewiring in the speakers or of course the amps and pre-amp.. the hum seems to be gone, we'll see as things warm up. edit: after one CD... the hum is back Now I need some major cable management now it's a snake pit

the service manual has been helpful. for things like a starting point for crossover frequencies and the part # for replacements on the 12" drivers. When I got them the 12s had been replaced with the correct pioneer replacements but they were black cones. I was able to find some original FB tan cones Probably not much sonic difference but now they are correct.

the speakers I will use are either a pair of pioneer CS-a700s or I have a set of white van speakers with aftermarket drivers, that I mounted 3 pairs of banana connectors to (one pair for each driver). I will try it first with these since my pioneers are still original and I would hate to blow a driver that is not replaceable. I have done this with a dbx234 and three kenwood amps in the past. It worked but running three amps was a little much. I am waiting for delivery of the PMX2 card with Manuals !!! for my PM-600 and see what I can do with that. I know it can bi amp and i think it might tri amp, it might not. finding documents on these is impossible. I will scan the manual, probably, and load it here if that is allowed.

I guess I'm into carvers now. in about a month and a half I have acquired 2 PM-600s which means I needed a C-1 preamp which came with a TFM-25 and a TX11 I have a PMX2 on its way. my design is to tri amp a set of speakers. why I am here to see if I can find a manual for the PMX2. I am also running Kenwood BASIC M2(A) amps and a Sony M65. Glad this site exists