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From time to time there are threads here concerning xover resistors. In several of them, I have recommended Caddock MP930 thick film resistors with a heatsink, and the reaction was mixed. Some inmates found them suitable, others not.
A few months ago, I rebuilt my passive xovers and used Caddocks exclusively at every position, four in all. There is only one in series with the tweeter, the Scanspeak (formerly Peerless) Discovery HDS. I was impressed with the amount of high frequency detail, but there was always a bit of shrillness to high strings and sibilance on vocals. Cymbals sounded excessively hissy without much ring or depth to them. During extended sessions, I found myself somewhat irritated by the highs.
Just last night, I replaced the Caddock in one channel with Mundorf MOX, which I have also used in the past. After playing music for only a few minutes, I noted a much more relaxed and musical presentation. Vocals became richer, cymbals had a spacious ting upon being struck and rang smoothly. Strings also became sweeter and better defined with greater depth. There was a very slight loss of overall detail (or perhaps a reduction of excessive detail), but dang if this doesn't sound a lot more like music instead of some electronic reproduction.
So I'm retracting my previous endorsement of Caddock and now going with the Mundorf MOX. They're cheap (which is not critically important to me but still a factor) and readily available in lots of values, and I do believe they're more musical than Caddock, more accurate than Mills, and superior even to Duelund, which I found a bit dull and washed out. The only "major" boutique type I have not tried is Mundorf M-Resist.
Peace,
Tom E
berate is 8 and benign is 9
Follow Ups:
Like capacitors, I feel that resistors should not be all of one type or manufacturer in the chain. As you noted having one type imparts it's own imprint, not always for the best. Mixing them gets you away from that.
I favor KOA Speer because I had an opportunity to buy out in bulk some time ago. I felt that these were an excellent value, even at retail prices, but make certain to mix in others. Compare these to Kiwami SPR Carbon comp resistors.
I'll look into the Mundorf too. Thanks
I intensely disliked the sound of KOA Speer resistors anywhere in my circuits. The Vishay/Dale's are about as good as it gets for mass production, low wattage parts, available for a few cents more. Does anyone really use that many resistors that a dime difference is critical? Besides, what KOA resistor is suitable for passive xover? Do they make 10 watters?
I typically do the mixing thing. Good advice that has been reinforced here.
Peace,
Tom E
berate is 8 and benign is 9
Only difference is cost.
Has anyone tried Path Audio 10W non-inductive non-magnetic? What were your thoughts/how did they sound?
Not likely that I'll ever try one at $30 a pop! Essentially, they seem similar to the Mundorf or any other MOX, with a fancy copper tube and epoxy encapsulation (WHY?), some very flashy paint, and a useless "drain" wire attached. Audio bling?
I would also like to be persuaded by anyone who has used them that they're better, but it would require a lot of controlled testing to convince me.
Peace,
Tom E
berate is 8 and benign is 9
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