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Old 25th May 2004, 01:49 AM   #11
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Default to Zobel or not to Zobel....

Sure a Zobel makes proof against all sorts of stability issues, but there are also those who have made a stand that they won't use one because they don't like what it sounds like -- NAIM is the one that comes to mind... (they do specifiy no exotic speaker cable, because the amp is designed with the cable providing the funtionality of the zobel)

Unlike a NAIM, which will go "pop" if you abuse it such, the SPIKE will protect the LM in most cases.

So if your amp doesn't oscillate in the system it is in, do you need a Zobel? No. If it does, then you do. Often, just changing to different speaker cable (ie zip cord) will provide the zobel function.

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Old 25th May 2004, 01:59 AM   #12
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Hi,

Quote:
Often, just changing to different speaker cable (ie zip cord) will provide the zobel function.
Has anyone ever wondered why the bindingposts on an amp/speaker are kept about an inch apart?

No, it's not just to prevent them from shorting...

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Old 25th May 2004, 02:11 AM   #13
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Quote:
Originally posted by fdegrove
the bindingposts on an amp/speaker are kept about an inch apart?
3/4" is the standard width for using dual banana plugs...

dave
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Old 25th May 2004, 02:32 AM   #14
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Hi,

Quote:
3/4" is the standard width for using dual banana plugs...
Now you mention it, yes...that's it. Thanks, Dave.

Anyway, you could turn my remark about it the other way around and also wonder why on earth cable designers are putting out such high capacitance loudspeaker cable...at the risk of sending many amps into instablility?

What exactly is it that this does? Why would you want such a cable in the first place?

Let me tell you that you can tackle the problem they try to "solve" in a different way without causing instability problems in the first place.
Maybe the amp wouldn't measure too well with it but then CDPs don't measure all that great in that area either...

Just my two cents,
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Old 25th May 2004, 03:17 AM   #15
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Anyway, you could turn my remark about it the other way around and also wonder why on earth cable designers are putting out such high capacitance loudspeaker cable...at the risk of sending many amps into instablility?
Tradition. Remember the Polk and Discwasher high-end cables of the late '70s? They improved the distortion figures and S/N ratio of many amps by the expedient of blowing them up.
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Old 25th May 2004, 03:27 AM   #16
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Hi,

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They improved the distortion figures and S/N ratio of many amps by the expedient of blowing them up.
LOL...

Just imagine they could have achieved just that by putting the binding posts on the amps 2/4 of an inch closer together....

Not even the beefiest of Zobel networks could have helped there...eh, eh...There you go, Peter...

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Old 25th May 2004, 03:56 AM   #17
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Quote:
Originally posted by SY
Remember the Polk and Discwasher high-end cables of the late '70s?
I've a relative stashed somewhere... Cobra Cable -- braided gold & green magnet wire. Caused the failure of many a poor amplifier.

dave
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Old 25th May 2004, 04:03 AM   #18
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Hi,

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braided gold & green magnet wire. Caused the failure of many a poor amplifier.
Hmmm...sounds like the one Monitor Audio marketed this side of the pond in the Seventies; the shorter runs were flat Litz, the 10m+ came in round braids.

I once hooked it up on a simple Denon solid-state amp and it popped its fused before the warm-up was even started....Very powerful cable that...

It did work well enough with tube amps though...see, there's where OPTs come in handy...

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Old 25th May 2004, 05:15 AM   #19
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Default Re: to Zobel or not to Zobel....

Quote:
Originally posted by planet10

..., but there are also those who have made a stand that they won't use one because they don't like what it sounds like -- NAIM is the one that comes to mind... (they do specifiy no exotic speaker cable, because the amp is designed with the cable providing the funtionality of the zobel)

... providing ... the zobel...

Hmm...

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Old 25th May 2004, 05:29 AM   #20
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FD (sorry that I called you "Jaws" several times), you are an expert on electronics with good experience.

PD, you are an expert on the industrial design with good experience.

If both of you join and create an amp, it would beat Pass amp. I suppose so...
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