I'll be honest with you,I had much better luck without the B&W filter. I chose to go without......I found the B&W filter actually hurt the overall sound in my system.
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Hklai: I had a pair of 801 series2 for many enjoyable years and found the B&W filter very noisy and irratable. Rather than fork over the extra $$$ for the Krell any other very expensive after market filters, I chose to go without.You may have better luck with yours.Also,many by-passed the IPOC ( I think thats what it was called ) which many said at the time was the biggest complaint about these great speakers..Great speaker have fun!
According to my B&W 800 Series Variable High-Pass Alignment Filter manual, the filter has 10 switches (numbered (from bottom to top) 1 through 0, for each channel. The Matrix 801 speaker switch position for each speaker is listed as follows:
Switches 2, 4, 7,and 9 on. The other switches are in the off position.
The positions for the Matrix 804 are listed as:
Switches 2, 3, 5, 7, 8 and 0(10?) on.
I have B&W 808's which are not listed in the manual. If someone knows the correct positions for these speakers, please post.
Mac2c, the alignment filter is definitely not for the 808. The 808 by itself has got a free field response of ± 3 dB 30Hz -20 kHz. You don´t need a filter for these ones. I ma using the filter now on my 800 matrix system but I bi-amplifie so it doesn´t hurt the sound at all. Actually it is a must.
Maarten de Boer The Masters
Older thread but I just picked up a filter for my 801 matrix S3 - it improved things substantially. I did not use the preamp tape loop for connection but put in between the amp and preamp.
Greater solidity, more definition in the lows. Much nore enjoyable. The part I really cant get over though is that any woofer movement on LPS has now almost diasappeared to the point I don't need to use the preamp filter setting.
I am sure there are many enjoying this high pass bass filter and we usually only hear more about bad experiences "like everything else" - this kept me also from trying it out. If you have any matrix 800 series speakers recommend giving it a try hooked up between amp and preamp. They do come up on ebay.
Thanks Ct0517, very interesting. I have a pair of 801 Matrix S3 speakers. I have had them for 5 or 6 years, but only just heard amount the filter. The doc I read said it was for all Matrix 800 type speakers but went on to say it benefited the series 1 and 2, but did not mention the series 3 at all. However it did say that later 800 series speakers were designed not to use the filter as it was ahead of its time and confused listeners.
I'm glad you had a positive experience with my series of speaker. This has made me decide to try and get one, or make one. It is only a butterworth filter, with a tuned rolloff for the 801.
The doc I red is below:
When the article discusses later 800 series it refers to Nautilus and onward. All 800 matrix series were designed by John Bowers to use the filter (equalizer). Here is the wording from the Rockwell article that hit home with me years ago. I have no affiliation with Rockwell.
(Actual article wording)
Now IMO after 19 years ownership of the s3, my hearing supports Rockwell when he says this.
This little equalizer is the brilliant little addition designed as part of this series of speakers to allow much deeper bass and more sensitivity than one could get otherwise.
B&W support also confirmed to me that the sensitivity of the 801 increases with the filter. How the figure differs from the stock 87db is not published. (i.e. Is it 88,89,90db ?)
I can tell you that my 801's are far easier to drive than my Acoustat speakers and the Eminent Technology LFT8a's. My OTL's were designed to drive Acoustats with ease.
I have no intention of removing the filter and in fact my gear placement layout is based on the cables allowing for its use.
If you go to this site and download the 801 Matrix 3 series manual.
Within the 801 matrix S3 manual are the B&W specs.
801 matrix s3 without the filter (equalizer) are 39hz -20khz.
801 matrix s3 with the filter(equalizer) are 20hz 20khz.
Here is the actual response graph from B&W.
I am currently using The Maughanbox version of the B&W filter and still own the b&w filter. In talking with the engineer that designed the Maughanbox; it is essentially the same as the B&W one however it is made with better parts and also includes rca and xlr connections. Its also designed in a way that permits RCA inputs from the preamp and xlr outputs to your amps if you are using a preamp with rca outs and need a longer run and are concerned about noise.
The Maughanbox version can be placed between the preamp and the amps. Its difference is it provides a (7dB boost at 20Hz vs the specified 6dB boost at 24Hz of the b&w one). It is very interesting when you first hear the sonic differences having been used to the b&w one for a few years.
imo - How all these components work good or bad is dependent on our own rooms. Even more so here because these filters are changing the bass compression in our rooms.
Everyone's room is different so we therefore need to try it for ourselves and not put trust in other peoples reviews.
Trust your ears.