ag777:

Hi, Trevor,

I have problems with Vishays availability - the local company I have ordered them from does not guarantee delivery within nearest future so I will try a litlle bit different approach. I found the following info in forums:

 "...I just did some listening and
spectral decay of Mundorf M-cap capacitors in 2 designs with the
following bypass capacitors added to each capacitor in series with the
tweeter and midrange drivers.the spectral decay showed small changes to
each one measured.Listening results were the Mundorf Supreme capacitors
with Silver/Gold and oil .01 bypass capacitors added to the Supreme
capacitors. These are by far the most enriching yet not compressing
blend of caps I have found.



Here is what I tested for bypass caps added to Mundorf M-cap capacitors



Dayton .01uf

Sonicap GenII .1uf

Sonicap Platinum .01

Mundorf supreme .1uf

Mundorf Silver/Oil .01

Mundorf Silver/Gold and Oil .01uf

Auricap .01



Money no object!

Mundorf Supreme capacitors

then add Mundorf Silver/Gold and oil .01 bypass caps to each series capacitor."

I have ordered Mundorf Supreme silver/gold/oil 1200 VDC 0.01 uF, however only 2pcs (as they are extremely expensive) to use them as bypass caps for tweeter 6.8uF caps.  I will  write about my impressions upon upgrade  completion.

The cost....Ouch!

Vishay MKP1837's are only around £1 each, Farnells is in Leeds where I live, which is where I bought mine (packs of 10).

What part of the world are you in?

trevor79:

The cost....Ouch!

Vishay MKP1837's are only around £1 each, Farnells is in Leeds where I live, which is where I bought mine (packs of 10).

What part of the world are you in?

Hello Gerrard, It was ag I was replying to, wondering if he lives outside the UK.
But it's nice to touch base with you as well.

Gentlemen, I live in Saint-Petersburg, Russia.

I have just finished bypassing Mundorf Supremes (6.8uF tweeter cap) with Mundorf Silver/Gold 0.01uF (not Silver/Gold/Oil - availabillity issues). Great improvement, maybe greater than from original Monitor Audio Caps replacement for Mundorf Supremes. Clear and transparent highs, very detailed and at the same time natural sound with no trace of my "old" RS8s harshness and excessive brightness.

Excellent!

Hi!

I have replaced MOX resistor 1.8 Ohm for Duelund carbon/silver 10W 1.8 Ohm (http://www.duelundaudio.com/Resistors.asp). I strongly recommend to do the same thing - sound quality increase will be equal or even greater than from all previous upgrades!

Thanks for the tip, the only thing I didn't replace!

Getting them ordered now.

Hi! You will definitely feel the difference! My first replace was Jantzen MOX, however Duelunds have made sound exquisite and refined.

Gerrardasnails:

trevor79:

The cost....Ouch!

Vishay MKP1837's are only around £1 each, Farnells is in Leeds where I live, which is where I bought mine (packs of 10).

What part of the world are you in?

I'm assuming the last question was for me Trev. I live in Surrey - quite near Leeds Castle but nowhere near you unfortunately.

how many leeds castles are there?

trevor, all this talk of modifications and positive comments from others after trying them, well, who wouldn't be intrigued?  i've had a poke about the net but can't find any info from anyone who has modded atc speakers, which makes it seem a bit of a risk to do.  is it possible to construct a new crossover, and then bypass the one inside for comparison?  and assuming there is an improvement worth giving up the warranty for, then replace the complete standard crossover with the new and improved one?

Just 1 Leeds castle and that is in Kent.

Modding or replacing the speaker crossovers is not too hard to do. I would always recommend you get the circuit diagrams off the manufacture to work with as it is important to replace with the same values, or as close to them as you can get.

It is well worth while building a new crossover unit on ply board as you can do a straight forward replacement.

Massive improvements to speakers can be made by using better components of the same values in new crossover units.
Clarity Cap SA's, Mundorf Foil M-Coils (oxygen free copper)and Resistors and Vishay MKP 1837's for by passing are my favourites at the moment.
Along with long haired wool for damping and decent internal wiring.

I have not run standard crossovers in any of my speakers now for 20 years, it makes the choice of upgrading tough though as they are just so, so good when modified.

Big Chris:

Gerrardasnails:

trevor79:

The cost....Ouch!

Vishay MKP1837's are only around £1 each, Farnells is in Leeds where I live, which is where I bought mine (packs of 10).

What part of the world are you in?

I'm assuming the last question was for me Trev. I live in Surrey - quite near Leeds Castle but nowhere near you unfortunately.

I always thought Leeds Castle was in Kent....... You live and you learn......

Guys I have question, one which the only people who have actually seen the crossover diagram can answer.

Assuming I want to bi-amp the speakers, which driver units are connected to the inputs? The tweeters obviously connect to the "Hi", what about the mid-bass and bass woofers? Are both units connected to the "Low"?

 A copy of the crosover unit diagram would be a big help.

regards