Hi,
We have sold a Pass 250/5owner a pair of our CopperFoil speaker cables and he reports the amp gets very hot with a slight burning smell after playing an hour.
Our cables are parallel foil construction, similar in concept to the Goertz cables from AlphaCore, and certainly have high capacitance.
Is the 250.5 sensitive to cable capacitance? And if so, is there a fix? We are in Switzerland but the amp owner's in Italy so we can't easily do anything ourselves.
Regards, Allen (Vacuum State)
We have sold a Pass 250/5owner a pair of our CopperFoil speaker cables and he reports the amp gets very hot with a slight burning smell after playing an hour.
Our cables are parallel foil construction, similar in concept to the Goertz cables from AlphaCore, and certainly have high capacitance.
Is the 250.5 sensitive to cable capacitance? And if so, is there a fix? We are in Switzerland but the amp owner's in Italy so we can't easily do anything ourselves.
Regards, Allen (Vacuum State)
You can put a zobel network across the speaker terminals. I believe details are on the Alpha Core website.
A friend of mine had this problem with a Classe amp and a high capacitance Supra cable. Not sure what it does to the sound though.
I also recall the Max Townshend flat cables had a built in network to stop this happening.
sp
A friend of mine had this problem with a Classe amp and a high capacitance Supra cable. Not sure what it does to the sound though.
I also recall the Max Townshend flat cables had a built in network to stop this happening.
sp
I don't recall having PL amps oscillate into speaker cables,
including the Goertz, but I know that they are on the "list"
with a number of manufacturers.
A real possibility is a fault such as a short.
In either case, if the amp is running hot, presumably the
meter will show the excess current. You can compare it
in operation with and without the loads connected.
including the Goertz, but I know that they are on the "list"
with a number of manufacturers.
A real possibility is a fault such as a short.
In either case, if the amp is running hot, presumably the
meter will show the excess current. You can compare it
in operation with and without the loads connected.
A real possibility is a fault such as a short.
This is what I was thinking as I was reading thru this thread....
I was also thinking that if one was having difficulty with a product, one might
check with the mfr directly as a first go rather than airing it out in public as
a starting point.
.......
I was also thinking that if one was having difficulty with a product, one might
check with the mfr directly as a first go rather than airing it out in public as
a starting point.
Well said!
This is especially true since the designer is rather generous with his time and experience.
I don't have a connection for him, but Nelson was the first replier, but gave no advice then or since.
And I'm not claiming a faulty amp, just the combination of amp and my speaker cables.
Regards, Allen
Regards, Allen
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