High-End Regulated Buffered Inverted GC

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#323
tbla said:
perhaps there is a hidden potential for improvement - did you try other brands.....holco, vishay.......and an exotic poly/teflon cap.....?
Click to expand...

Years ago I saw these speakers opened, and I saw the crossover (the cap seams a good one) on a magazine.
Looking at my Epos, I never figured out how to open it.:bawling: :clown:
It has four big metal bars joining front and back panel.
The woofer is molded on (is part of) the front panel (another Epos way of doing it, how to diy this?), the tweeter has no screws at sight, they are inside the box...
This box is completely "dead", no resonances at all.
I never lost much time trying to figure out how to open it anyway, as I love their sound, everything seams spot on.

*** EDIT ***
You're right tbla, there's a "hidden" potential.😀
 
#324
Sorry to keep this off topic.

I owned a set of these back in the mid nineties, they are everything Carlos makes them out to be. Epos released a cap upgrade for them a few years after release to improve 'clarity'. I also seem to recall they loved being bi-wired as well, quite a dramatic difference from a single cable run........

Nuuk,

You need 4 regulators per amp!?? Can Rapid supply the TO3 version?
 
#325
NealG said:
I also seem to recall they loved being bi-wired as well, quite a dramatic difference from a single cable run........
Click to expand...

Neal, my Epos didn't come with those adapters for single-wiring (those metal clamps), and I made an atapter with Kimber cable and good 4mm plugs (bananas, as we call them).
Kimber 4TC is not cheap, and anyway I prefer to have good cable than buy cheaper and bi-wire.
Most of the times you are doubling the capacitance of the cable...
Don't take me wrong guys, but I don't see much advantage in bi-wiring, quite the opposite.
Most of the times what you gain with bi-wiring is to remove those nasty metal clamps, but you don't need to bi-wire to remove them, just join the terminals with a small piece of good cable.😀
Bi-amp yes, that's a completely different story.

Neal, do you have any idea how to open them?:bawling:
 
#326
Hi,

Don't take me wrong guys, but I don't see much advantage in bi-wiring, quite the opposite.
Click to expand...

Probably not with speakers that have such a simple x-over as the Epos. Other LS may be a totally different story.

As for cable capacitance, it can be problematic for some amplifiers but you could just as well use less capacitive cable in the first place.

Most of the times what you gain with bi-wiring is to remove those nasty metal clamps, but you don't need to bi-wire to remove them, just join the terminals with a small piece of good cable.
Click to expand...

Surely, Carlos, you may want to look into the theory behind bi-/tri-
wiring first?
What about speakers that don't have any provision for multi-wiring and therefore don't have those nasty bridges?

Cheers,😉
 
#327
You need 4 regulators per amp!?? Can Rapid supply the TO3 version?
Click to expand...

Well, you could get away with just two I suppose! Of course they would then need the larger heatsinks as they would be working twice as hard.

Rapid have the T03 versions at 5.50 UKP (plus very awful tax). By using four, the LM338 is more than up to the job (IMHO) and the cost is 4.20 UKP compared to nearly 13 UKP for a pair of the T03's!

Carlos, a friend of mine had a hell of a time getting into his Epos 14's but he did it eventually. He is away at present but when I see him again I will ask him how it is done. Of course those of us with enough sense to use OB's don't need to 'get inside' them! 😀
 
#329
fdegrove said:
Surely, Carlos, you may want to look into the theory behind bi-/tri-wiring first?
What about speakers that don't have any provision for multi-wiring and therefore don't have those nasty bridges?

Cheers,😉
Click to expand...

Yes...?
There are many good and expen$ive speakers that have only one pair of terminals.
Anyway, with a budget to spend, If I was given the chance to buy one single run of, say, Kimber 4TC or double runs of cheap Supra cable I would go for the first, anyday, anytime.
Just my oppinion, ok?
Piece in the world.:angel:
Oh, wish me good luck for tonight.😀
 
#330
Nuuk said:
Carlos, a friend of mine had a hell of a time getting into his Epos 14's but he did it eventually. He is away at present but when I see him again I will ask him how it is done. Of course those of us with enough sense to use OB's don't need to 'get inside' them! 😀
Click to expand...

Thanks, Nuuk, when you have news about that, drop me a mail.
As long as I don't need a hammer to open these things...:zombie:
 
#333
My two cents

Hi Carlos

I appreciate your work with the regulated psu. I can imagine, that the effect for the sound is good, even when the chip already has about 7 current regulators implemented.

Maybe, the chip really sounds better, when the correction work is smaller. Same thing like feedback with a single ended tube amp: you can correct errors, but you loose some information.

As less errors needed to be corrected, as better the sound.

I did not read all your posts, Carlos. But my question: do you have some measure equipment (scope etc) and do you check your amps this way?

Regards
Franz

BTW:
Do you believe in biwiring or do you know it? 😀
 
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