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1. #Klipsch promedia 2.1 thx subwoofer replacement parts mods#
2. #Klipsch promedia 2.1 thx subwoofer replacement parts Pc#

To remove heat from the componant side of the board I relocated them to the foil side.

With little to lsoe I followed Klipsch' lead and replaced my 800 ohm with 1K Xicon 2W metal oxide resistors. While I had it out I replaced the electrolytic caps with either Elna Silmics or Nichicon VRs depending on what would fit (same values).īELOW: According to the online schematic later version Promedias received 1K 2 watt resistors in this spot. To remove the board I had to unsolder its pins from the board next to it. They measured about 913 ohms which is 15% out of spec. My Promedia is an "early" unit and has pair of 800 ohm 5% in these spots. The resistors are situated above the board in a standard practice to aid in cooling.which apparently doesnt work well. The cause is well-known and is due to a pair of resistors on the subwoofer board overheating over the years and melting their solder joints.burning the board in the process.

#Klipsch promedia 2.1 thx subwoofer replacement parts mods#

I suspect this is where many reports of these subs being unreliable came from.Īfter the mods above I didn't use the system for about a year and when I powered it up the satellites sounded fine but there was low muffled bass coming out the sub. As with stereo receivers, it's common for exposed speaker wire ends not to be pushed in all the way.and easily short the wire next to it. This means optimizing the Control Pod circuit will have an audible effect on the sound quality.ĢND NOTE: using speaker spring-clips on the back of the sub where they can be easily kicked loose is a poor design. through the "20uf" NP input cap circuit.back down to the sub.to the HF amplifier inside the sub.then out the speaker jacks to the satellites.

#Klipsch promedia 2.1 thx subwoofer replacement parts Pc#

NOTE: If you follow the circuit, the musical signal from the PC first travels to the Control Pod under the speaker.

A TLO74CN low-noise JFET op amp and assorted resistors, diodes, etc, round things out. I'm guessing it was for space considerations. A NP cap is actually two polarized caps reversed inside a case.but this is the first time I've ever seen separate pairs soldered this way. In a peculiar move they are wired as reversed pairs to create 20uf non-polar caps. The four on the top left are 10uf 50v polarized caps which if you look at the schematic are the input caps for each channel.

Inside are some electrolytics just begging to be changed out. This "overdesign" is an unexpected but welcome sight.īELOW: the Control Pod beneath one speaker is slides back and comes out with a bit of fiddling. The heavy, dual-magnet design is unusual for a tweeter.especially in a speaker meant to receive only 35 watts max. The mid-woofer is fairly robust with a foam surround and a long-throw magnet.