Chorus X-over Problems.

[mike stehr]

Howdy.

O.k., I have a pair of '89 Chorus II's I purchased

a few months back at a thrift store with the Amp

and Pre-amp.

Yamaha MX-1 power amp and CX-1 pre.

Yeah I know, Yamaha! Yay. I haven't read too many

raves on matching Yamaha gear with Klipsch gear but

these units are somewhat heavy-duty for Yamaha.

They have decent audio-grade caps, the power amp has dual transformers and weighs as much as a Chorus II.

(The 1/2 inch metal plate for the bottom of the damn

thing is probably a good reason why).

And they were a hundred bucks for both and in

excellent shape.

The Chorus's seem to run better with these units,

than the AX-592 I had. (Yeah more Yamaha! Argh)!

One Chorus when purchased has a bad X-over.

I would like to upgrade these crossovers.

Now could'nt you take the existing crossover,

use the same autoformer,(transformer)and then

replace the sand-cast resistors with high quality

non-inductance(or low)resistors?

The same with the inductors, replace with high

quality. (like the ones mentioned by ALK engineering).

Then dump the electrolytic caps, and use high quality

audio-grade bi-polar caps.

Using the same values(Of course) and wiring the X-over the same as the original.(Same taps on autoformer,etc.)

Would the X-over SOUND better?

I know, thats a pretty dumb question.

Or would this possibly cause impedance problems or other anomolies due too higher voltage and tighter tolerance parts?

Your replys are greatly appreciated.

(This problem with my Chorus has been bugging

me for months!)

THANX! Mike Stehr.

[Mike Lindsey]

Mike,

Are you sure they are Chorus II's? Chorus II's were manufactured from 1990 - 1996 whereas the I's were produced from 1987 - 1990. The II's came with a 15" passive radiator in the rear where the I's had 2 ports at the bottom-front of each speaker. What are the Serial Numbers? That should tell you what year they are (the first two digits are the year). Either way, I saw there was a guy selling the Chorus crossovers on Ebay. Here is one that just sold but it wouldn't hurt to contact him anyway...

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1282103540

Mike

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Family Room

-----------

Hitachi 43UWX10B HDTV (16:9)

Denon AVR-4800

Acurus A200X3

Panasonic DVD-RP91K (Progressive Scan & DVD-Audio)

Dual CS-5000 Turntable w/Shure V15V-MR

DBX 3bx Series III Range Expander

Mains - Chorus II (Oiled Oak/Acurus Amp)

Center - KLF-C7 (Finished Black/Acurus Amp)

Surrounds - Chorus I's (Finished Black/Denon)

Surround Back - RS-3's (White/Denon)

SVS 20-39CS Sub w/Samson S700 Amp

Monster HTS-3500 Line Conditioner

Scientific Atlanta Explorer 2100 Digital Cable box

Monster M-500 Component Video cables

Monster Datalink 100 Digital Coaxial cables

Radio Shack Gold Series & AR for all other audio interconnects

Bedroom

-------

Mitsubishi 31" TV

Yamaha M-4 Amp

Yamaha C-4 Preamp

Yamaha T-7 Tuner

Teac DVD Player

Dual CS-721 Turntable w/B&O MMC2

Looking for a pair of Cherry or Mahogany Heresy's

[mike stehr]

Yes Mike, They are Chorus II's.

Serial #'s

299594369

198592452

Inspected by:

Julie Hood

Neyda Jones

Finish Black.

Made in Hope,Arkansas.

The input cup has a 1989 date printed on it.

That's why I figured they were '89's.

I'll check the guy out on E-bay, Thanks!

But the thing is, I want to improve upon the original

crossover using higher quality components.

I'll just have to hunker down and figure it out

when I get a X-over schematic.

Nice gear! SVS sub!

I've been hunting for some subs,

to retire a old rockford fosgate 8 ohm pro series

car woofer in a ported box, Boomy.

And have read the raves for Svsubwoofers.

Read the site, the board here, and have not read a bad thing about them.

Looking forward to some realistic bass.

I see you have SV20/39 with a Samson 700.

I have been considering the two SV16/46's

with the 700 watt Samson amp as advertised.

How does the SV20/39 setup work with the Chorus II's?

Do they extend the bottom end nice, match up well,

nice and smooth...etc...???????!!!!

Would you think two 16/46's could be overkill?

Your opinions?

I'm pretty certain I would more than happy with

these subs, (better than the fosgate for sure)

but would like to hear a straight up honest opinion.

Thanks Mike.

Mike Stehr.

[Mike Lindsey]

Mike,

I believe what you have is a pair of 1995 Chorus II's, according to the serial numbers. From 1990 - 1997, the SN's were formatted like so:

DOYY2Y1####

DOY = Day of Year (198,299)

Y2 - Year 2 (5)

Y1 - Year 1 (9)

#### - Consecutive number for Day of Year

Based on the SN's, I would have to think yours are 1995 models.

As for the SVS subs, I don't think you can go wrong with them. The only reason why I have just one is I couldn't afford the 2nd one at the time. Hopefully, within the next year, I will have my 2nd 20-39CS. So, if you get a chance and can afford it, I would definitely go for two!

Doug Drake posted this link the other day on some Forte/Chorus mods. One of the mods talks about replacing/rewiring the x-overs...

http://216.37.9.58/ubb/Forum16/HTML/000141.html

Mike

[JCturboT]

Mike,

I don't know what the rest of the crowd has for Yamaha gear(receivers-home theater,ect.) but your Yamaha MX-1/CX-1 combo is top of the line even by todays standards.

I run my Cornwalls with a Yamaha M85 amp/CX1000 preamp combo and the sound is unbelievable.Clean and crisp without any trace of the harshness or shrill which is what I have read described by some people running Yamaha equiptment.

If your amp is set up like mine(which I think it is)it is actually a dual momo amplifier which runs Class A up to 20 watts which as we all know is the true test for Klipsch speakers-the first couple of watts are where its all at!

On a side note if anybody knows of any early 90s Yamaha 2000 series components(the titanium series with the cherry endcaps)please let me know because I've always loved the looks as well as sound of these fine pieces. Jeff

[Craig6519]

I'd have to agree with JCTurboT, I've been using Yamaha for 15 years and agree that what you have is outstanding especially considering what you paid for them.

Thanks

Craig

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Klipsch KLF30 Mains

Klipsch KLF-C7 Center

Klipsch KSP-S6 Surrounds

Klipsch KG4 Surrounds

Klipsch KSB 1.1 Front Effects

Dual SVS 20-39CS Sub's

Samaon S700 Sub Amp

ART 351 Eq.

Yamaha DSP-A1

Acurs 200x3 (In the mail)

Yamaha MDX-793 Mini disc

Yamaha TX-492 Tuner

Sony CDP-C701ES 5 disc Player

Sony S565D DVD

Hitachi MX6080EM Muli-system HI-FI VCR

Hitachi 29" T.V.

Denon DP-37F Turntable

[mike stehr]

Thanks for the replies guys!

Now that I think about it, these are '95 Chorus II's.

The drivers had '95 printed on them.(DUH!)

Maybe the 1989 date on the input cup is when

the series was introduced.

Whatever the date is, I like them.

I'll just have to get a crossover schematic, plus

possibly new Chorus II X-over's from Klipsch

and play with the old ones.

I bought the MX-1 amp and CX-1 pre-amp because

they were the units that were for sale with

Chorus II's, and I figured that they would be a

better match up than any of the gear I had.

And they were cheap.

I did'nt think much about the units when purchased,

other than the heavy amp.

When I got home and cleaned and inspected the

components I realized I had some quality items

by the audio grade capacitors and lack of cheap construction.

The Amp is 440 watts with a 35 watt pre-amp,

Daul mono with two trannies.

I'm pretty certain that the amp is in class A

mode still when the Klipsch's are at 100 decibels.

(I have a rat-shack meter, it does'nt take much).

I'm happy as pie with them.

A couple little things though, the pre-amp has

a real wimpy power cord.(I don't understand this,

the pre-amp has some hefty Nichicon great supply

power supply capacitors, but a glorified lamp

cord for AC.)

The amp has input sensitivity pots, something

you see with car amps but home?!

More than likely for matching output sesitivity

of various other Yamaha pre-amps to the input

sensitivity of the MX-1.

Which is great for matching up other units and

brands of pre-amps, but kind of lame from a purist

standpoint.

I mean is'nt the CX-1 the intended pre-amp for the

MX-1?

But these are easy mods, a better power cord for

the pre-amp, and matching the output sensitivity

of the pre to the power amp input sensitivity by

using high quality resistors matched, I guess.

I have no complaints with Yamaha gear, its just

all I ever had.

I had a AX-592 integrated with a pair of Sansui 5-ways

from the mid-eighties that I converted to 3-way

with a pair of Vifa D25 aluminum domes.(better X-over).

Sounded good, and plenty sensitive.

But nothing like the Chorus's.

When I bought these speakers I was so glad to

have a Klipsch site with a BB, and helpful folks.

Its a nice tool for getting these speakers to

shine like they should.

Thanks for input!

I'm gonna go for the 16/46 dual subwoofer with

Samson 700 amp, (if I can get one).

I have the money, and my friends will think I'm

stupid and it seems dumb, but the hell with it, it will be the last step for my stereo.(At least 'til 5.1).

THANX!