Ferrofluid

Ok.  So I just got off the phone with Bill from Miller sound. Very nice guy BTW. He said that he definitely does that it is very responsible $105 ea tweeter. But he said to be extremely careful shipping them if I can’t make the 2.5 hr drive to PA from NJ where I am. But —— he said IF I still hear good and loud treble with my tweeters they are definitely still good with the ferro fluid and he advised me not to touch them. BTW last night before I even heard about this Ferro fluid thing I was up in my music room for about 5 hrs enjoying my system and I decided to take all 6 speaker covers off and listen for the rest of the time with them off. And as I was listening to the Cars - Dangerous Type , btw I love the drums thundering and exploding on that song with my speakers. So i definitely heard the great loud detailed treble on both tweeters. So I will definitely take Bills advice and until I hear anything different ( negative) with them I’ll leave them be. Bill also mentioned a place closer to me in NYC that he recommended that does great work on speakers too. It’s called Technetron. That way I could bring them in instead of taking a chance and shipping them and having them get damaged in the mail which I very much appreciated him telling me that also. 

@timlub @jetter @erik_squires   Thank u all who posted. And thank u jetter for mentioning Bill from Miller sound. I will definitely be calling him about this. I have a couple questions. By cleaning out the old ferro fluid and putting in new what will I really hear if anything. And what if I do not do this. Would it cause any harm to the tweeters since my speakers were built in the 90s ? Also I will be upgrading all my 8 crossovers (4) in ea speaker very soon also. Like it did mention in post I already think they sound phenomenal. But since they are from the 90s and I do plan on not selling I think it’s a good idea for an upgrade on all I can do for them. 

@jetter Right now I will hold off and put the ferro fluid on the back burner. I’m just very glad to know more about it and more importantly where to go to have them serviced. About the crossovers. I found a guy on EBay who makes crossovers from original speaker schematics using all much higher quality caps and resistors than originals including better wiring etc.  Says as follows. This auction is for B&W brand 800 Matrix. This auction is for a pair of new crossovers. They are built to the original schematics with the improved parts quality and some small tweaks to take the speakers to another level of sonic purity.  Service provided   Full crossover upgrade. Replace capacitors in tweeters with premium film capacitors. Replace midrange capacitors with poly film capacitors. Replace tweeter/ midrange resistors with film type resistors. Replace all capacitors in woofer section + film bypass. Replace woofer inductors with 14/15 awg steel low distortion core inductors. Replace midrange inductors with air core low distortion type. Replace all resistors with higher power type.  In return you will get more powerful better extended low frequency , more dynamic clearer midrange. And smoother higher resolution highs. The speakers will come to life with more detail and dimensions.  20+ years of experience in high fidelity crossover design. He has a lot of great reviews with his crossovers. I was emailing him last night and seems very knowledgeable and gets back to you right away. He also offers a 3 year warranty. And said his crossovers will be good for at least 30 yrs. His username is Crossoverchef-com   Check him out. 

@timlub Thats exactly what Bill said at Millersound about it thickening as it ages and will harden overtime. Do u also build crossovers. ? If u do and or know about crossovers I would love your professional opinion on the crossovers from a maker on eBay as I mentioned a few posts up. You can look them up on EBay if u have it. Just search for B&W 800 Matrix crossovers. Thank you and I appreciate it. 

@timlub Also forgot to tell u I also have and am using 2 Krell B&W BAFs. ( Bass alignment filters for my 800 Matrix.u can also see my system and all the components and cables etc etc from my profile. 

@timlub   Tim. Thank you for your detailed reply. I really appreciate it. I want to say first if all that I would not even think of doing this if I didn’t have someone to install and solder the crossovers in for me. When I first bought my ARC REF 750s and was playing them the first few hours I had a tube arc and it took out a resistor. I called up my ARC dealer here in NJ and he hooked me up with an awesome Technician. I ordered what I need from ARC and when the parts arrived he came to my home and installed and soldered everything and also checked both amps out and gave them a clean bill of health. And said that they are in excellent condition. So when I told him and showed him and had him read about those ( supposedly) upgraded (better sounding 🤷‍♂️) crossovers on EBay he said that they sounded good. And that he would have no problem replacing and soldering them in at my home.Now mind you and I know he does not build crossovers or maybe he does not know much about building crossovers other than how to install and solder them. So he is just probably also going by what he read about them from what I sent him. Ok. Now I have some questions and opinions from u Tim. Knowing that my speakers are from the 90s and since I had them now about 8 yrs now and really never had a problem with them. Would u think I would need to change or replace the caps and all that is involved in the cross overs ? Wouldn’t that be like an amp dating back to the 90s ? Changing upgrading the caps and resistors etc ? Also what I did want to mention is the only issue I do have with my speakers is the highs coming from the tweeters being too bright along with the voice. Now it’s not all the recordings but many. My question is if I do change and upgrade the crossovers can something be done about that with the crossovers from the tweeters ? Now let me also say that I only listen to digital. I also have a ARC Ref 6 that I bought brand new a few years ago and only put on 600 hrs. I did just have gotten it upgraded from ARC to the Ref 6 SE. and have it now for about 2 months. All my tubes in my amps and pre amp have about 700 hrs on them so I know it’s not from the tubes. But it’s really that brightens and some recordings are too bright IMO. Other than that the speakers sound phenomenal. Especially the powerful bass. And I really thought u was going to loose ALOT of that when I replaced my Krell FPB 600 which are known for thunderous bass with B&W s. But it’s definitely not the case. I did loose some but definitely made it up for all the other quality’s with the ARC 750s. Now I also wanted to ask you IF I did want to upgrade all my 8 crossovers can u possibly make them for me with your expertise and knowledge? 

@timlub   Hey Tim. I definitely hear what you are saying and totally makes 💯 sense. I really would like to get the most performance out of those speakers and I know totally agree what u are saying about only replacing the necessary parts and caps. Maybe some better wiring too ? I would really love for you to do the work on these crossovers for me if u would like to take on the job. I appreciate your time  everything you said to explain all of this for me. And I’m sure I’m making the right decision now not buying those crossovers from eBay. And he also sent me a pic of the new crossovers and they look totally different with a lot less parts and caps. And it looks like they are mounted on a piece of plywood and not a circuit board. If they are. I forget when I installed them when I got my speakers. 

@katman   Thank u for your reply. I will certainly think about that and possibly I can have my service tech come by and check out the crossovers. I have said that about the Cars song She’s Dangerous. The drums in that song sound phenomenal on my speakers. 

@timlub Tim. I left u a PM on here. Mike. 

@68pete I definitely will keep all updated. Looking forward to hearing some really nice improvements in about a month.