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About JoeESP9

  • Birthday 09/21/1947

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  • Location
    Philadelphia PA
  • Interests
    Imported beer<br />Bicycles<br />RC cars, planes and helocopters<br />Retired computer professional.
  1. I'm with fud57. Why not use two good speakers? Stereo only has two channels! Connecting a bunch of speakers ruins the soundstage and imaging.
  2. I think the reply is yes. Try some "real" speaker wire and I bet it goes away. I'm beginning to wonder if anyone actually reads an entire post. The speaker cables I'm currently using are six foot lenghts of DH Labs Q10 Signature with 2x12 Gauge and 2x14 Gauge in each cable. The high capacitance of CAT-5 when braided is well known. A few amps have problems with highly capacitive/reactive loads. Adcoms are the only amps I own that become unstable. I'm certain Hafler, B&K, Accurus, Aragon, Dynaco and Kenwood amplifiers don't. When I got the first Crown I wired each subs DVC in series for an 8 Ohm load. When I got the second one I bridged both and use one for each sub. I Was thinking of re-strapping both subs into two separate 4 Ohm VC's. I would then run each Crown in stereo mode. I would therefore need another pair of cables for each amp. I looked in my parts closet and all I had was the CAT-5. Which I already knew caused instability in some amps. I'm quite lazy and didn't want to dig out my scope and a signal generator. I thought someone here might know if my Crowns are stable with capacitive/reactive loads. I fully expected them to be stable. I just wanted confirmation. Since then I checked with my o-scope and signal generator. It's as I expected. My XLS's are stable with CAT-5. BTW: The instability that leads to high frequency oscillation in some amplifiers does not harm the amplifier. It does however, reduce the power available and usable to the speakers. Some amplifiers that have an extremely wide frequency response can have the problem. That was my first post and I asked a semi-technical question as my introduction. No one answered my question. Thank you fud57. You attempted to be helpful. The rough equivalent of my CAT-5 is around 9 gauge (27 twisted pairs of 22 gauge). The two XLS402's were my first "Pro" amps. They were purchased on the recommendation of someone who was using his XLS802 to drive a pair of Apogee ribbons. Apogee ribbon speakers have a truly punishing load. It goes down to 1 Ohm. Any amp that could satisfactorily drive them was worth looking at. In any case, I bought another six foot pair of the same DH Labs Q-10. These amps drive only my sub woofers from 85Hz down.
  3. I believe we have a slight misunderstanding. When CAT-5 is used as speaker cable the outer cover and shield are removed. Three of the four twisted pairs are braided. Two more lengths of CAT-5 are stripped and braided. The three resulting cables are then braided. At both ends the solid wires are separated and crimped/soldered together. The striped wires also get crimped/soldered together. Yes, this does make a cable with rather high capacitance. Some amps don't mind others do. I made cables with 27 twisted pairs. That means 27 x 24AWG wires for the positive. It's the same for the negative. OTOH: Perhaps I should have asked, "Will a high capacitance speaker cable cause oscillation in my Crown's output stage?".
  4. Braided CAT-5 speaker cable has been used by audiophiles for many years. A google search of "CAT-5 speaker cable" will support this. I've used it on many different amps (Hafler, Adcom, B&K, Accurus, Aragon, Dynaco and Kenwood). Only the Adcom's exhibited any instability. Adding a Zobel network cured the instability. Some very expensive speaker cables have the same problem. One example of this is Nordost. I have 2 six foot pairs of CAT-5 cable that I braided myself. Currently it's not being used. I'm using DH Labs Q-10 Signature speaker cable at the moment and I'm quite satisfied it. I was just curious to know if a cable with an inherently high capacitance would cause any instability on my Crown's. I could check this with a signal generator and a scope. However, the two bridged 402's are driving my 12" TL subwoofers and I don't really want to disconnect them. The signal to them is bandwidth limited to 85Hz down. If anything a tendency to oscillate would be lessened because of this. I suppose I should mention that these two Crowns are the first "Pro" amps I've bought in 45 years of being an audiophile. I think they perform extremely well and are a downright bargain cost vs performance wise.
  5. Hi folks. New here and this is my first post. I have some CAT-5 speaker cable with 27 twisted pairs. This cable workes well with some amps and with others it causes high frequency oscillation. Before I try it with the two XLS402's I'm using to drive my bi-amped ESL's I would like to know if there will be any problem. With other amps that had a problem I installed Zobel networks on the cables. Should I use the Zobel's with my Crown's?