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-   -   Klipsch La Scala (http://www.diyaudio.com/forums/pass-labs/8216-klipsch-la-scala.html)

Duck-Twacy 2nd December 2002 09:50 AM

Klipsch La Scala
 
Hi,

Will the Klipsch La Scala be a good match for an Aleph5, or will I never get te amp "quite" enough for the high sensitivity of these speakers (104 db/1 watt)??
I am planning to use that pi filter (CLC) thing with 8 * 22000 uF per channel (and a "L" of around 2-3 mH).

Also the impedance has a dip of 4.5 ohm around 55 Hz and a peak of 42 ohm around 2150 Hz. Is that a problem?

Elso Kwak 2nd December 2002 10:19 AM

Klipsch and Amplifiers
 
Hi Duck-Twacy,
Klipsch loudspeakers are extremely unforgiving for bad electronic gear. I speak of experience as I own a pair of Klipschorns.
My greatest sin was selling a pair of Scala's to a custumer owning a Yamaha receiver. It sounded so painfull that I left his appartment in a hurry....... :ashamed:
I settled for a Gas Ampzilla after I found that a cheap Sony integrated amp sounded horrible. Then bought a Crown D-150, then SAE MkIV-DM.
I still own the Ampzilla and it is better than the latest space heater from Krell.
The Ampzilla seems to have a tube like sound quality. My friend has a VTL MONSTER with 12(!) ouput tubes per channel and much to my surprise the VTL sounded very similar to the Ampzilla. The latter had better controlled bass and highs. The VTL had smoother voices. I am not familiar with Aleph 5. My friend had a Pass design 20 years ago that sounded slightly less than the Ampzilla. I don't remember the model#.
A Pi-filter will for sure make the amplifier more quiet. I did that on the Ampzilla with 15 mH chokes. Ripple voltage on the supply is <B>MUCH</B> lower.;)
The rising impedance is due to the autotransformer in the crossover. It will do no harm but I left it out in my KWAK-CROSSOVER. If interested I can send you the schematic.

LaMa 2nd December 2002 11:56 AM

The selfnoise during idling of the amp becomes also a problem if the amp isn't proper build. 104 dB/W/m implies you can settle with much less power e.g. a low powered Zen, alephx or tubegear.

fcel 2nd December 2002 12:40 PM

It has been my experience that the Zen amp (version 1) works great on the Klipsch Forte' speakers (sensitivity of about 100db/1w) and it's capable of amazing amount of bass from just 10w/ch.

Nelson Pass 2nd December 2002 04:35 PM

We keep a pair of La Scala's for a reference, and they
are indeed unforgiving of electronics. Alephs and Zens
with quiet power supplies are excellent choices.

Duck-Twacy 2nd December 2002 05:44 PM

Thanx for all the replies.

Of course a 60 watt Aleph5 is a bit of an overkill for these speakers (Aleph3 would be sufficient), but I allready started the Aleph5 (actually I am, or "we are", in the stage of ordering parts).

Still dont know if I will buy the La Scala's. I like the dynamic sound, but I'm affraid I am too much of a beginner in electronics to get the amp quiet enough. They are also quite expensive (even second hand).

btw somewhere there was a thread about how to calculate the CLC (pi) filters. maybe somebody can point me to it (cant find it).

cyclotronguy 2nd December 2002 06:03 PM

Klipsch
 
Nelson neglected to mention the crossover changes to the Klipsch we keep around for reference.

The crossover's were from ALK Engineering (yes this is a shameless product endorsement) and make a HUGE difference...... all for the good.

Cyclotronguy

BrianGT 2nd December 2002 06:09 PM

Re: Klipsch
 
Quote:

Originally posted by cyclotronguy
Nelson neglected to mention the crossover changes to the Klipsch we keep around for reference.

The crossover's were from ALK Engineering (yes this is a shameless product endorsement) and make a HUGE difference...... all for the good.

Cyclotronguy

It is nice how they publish the updated crossover design for those to make themselves. Is this the same crossover that you are using with them?

http://www.alkeng.com/dload/xover.zip
from
http://www.alkeng.com/klipsch.html

--
Brian

SvErD 2nd December 2002 06:16 PM

Quote:

Originally posted by Duck-Twacy
Thanx for all the replies.

btw somewhere there was a thread about how to calculate the CLC (pi) filters. maybe somebody can point me to it (cant find it).

Try Supply voltage/Current draw(mA) gives the coil value in mH.
Svein

cyclotronguy 2nd December 2002 06:31 PM

ALK Engineering
 
Thanks BrianGT

That is the link for ALK, which I didn't have close at hand at the time of the original post. If you clone ALK crossovers from the on line schematics, please do not use lesser parts.

La Scala's usually respond well to upgraded wiring. The original connections with time degrade and should be cleaned and soldered.

Cyclotronguy


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