DavidR

Don't overlook the Black Beauty NPE from suppliers like Parts Express. Several restores like these. I'll mix and match just so I can get the values I need. The large MDL I have the leads are thinner and shorter than that on the Bennic and BB. Thanks for the info on the surrounds. My memory is not what id used to be. They looked so familiar. I went to my workshop and had a set in a shipping box from Rick. At least I won't miss my memory much. IIRC the 10 inch will fit the AR90 woofers.

Who is selling the Bennics now days? The leads on the MDL brand I have are quite thin and short. Some say using a bypass cap will help the larger caps discharge faster and thus a cleaner sound. Also using a film bypass on NPE bundle/base cap will enhance the SQ. What brand of surround is this and where can we get them?

Thanks Larry. I looked as I figured if anyone had them they would. The 80uF and maybe the 40 is still available at Parts Express. The 24 is best made up with a 22 and 2.2. A good thing about Parts Connxtion is if you email the owner (forget his name atm) and ask if they have any that measure high or low he will send you the info. I took a look at ERSE and they still have most of the 'common' values. IIRC the ESRE npe aren't highly thought of. Might be worth avoiding the ESR issue. I don't know about you but I've done ARs with NPE using film bypass caps on the series caps and going the all film cap route and I find the NPE to be better.

I HATE my wife's Bose Wave. Gives me listener fatigue after about 1/2 hour. Some like the 601 series 2 more than the 901 and others the 10. There is just something about listening to the 901s despite their short comings.

That's a picture of a series 3 802. The originals used wood and looked a bit more like the 901.

Looking for a pair of S1 speaker stands for my 10Pi. PM me

They were probably the 802 model.

Thanks for the info Larry. I looked up the EI-Cap on the Jantzen website. Where are you buying those? What irritates me is that the 'common sizes' are all changing. e.g. 30uF is now 33uF, 6uF is now 5.6uF, 8uF is now 8.2uF ......................

The Jantzen and Mundorf Ecaps are both made by F&T a German company.

Hope these help. (3) docs AR58xover.tif

Try the people at >>> https://dynacotubeaudio.forumotion.com/

Get the Series II. They are WAY better sounding than the ported series. Dave Shirley can rebuild the EQ so that you will get the most out of them. If you're really stuck on the ported ones then go for the Series 6.

Good for you. I'm sure having rare Allison speakers (as most are) there is a fear level that you may not be able to repair/replace a driver. Play On !

Yes, the HiVi tweeter but not the Midwest. However, I took a look at the Midwest website for the tweeter and they have made some minor changes. This may be due to Roy advising them on the LST applicability. Unfortunately my memory isn't as good as it used to be. Thanks for the 'leg' work.

Are you saying a coil change is required for LST tweeter replacement (only)? Because there is no coil changes required for 10Pi, 11 and all the 9-Series speakers with the MidWest driver. I believe there is also no coil change required for the 3 and 3a. There is a replacement driver (which one escapes me atm) that involves a coil addition but its not the Midwest unit. I agree that rebuilding the originals is the way to go if that option exists.

https://community.classicspeakerpages.net/topic/11472-midwest-speaker-ar-34in-tweeter/#comment-128945

thank you

Are the tweeters and/or midrange drivers from an AR5 able to be rebuilt ?

Yes. I currently have a pair of the series 2 - acoustic suspension. My 901 story, begins approx 1970 with my first pair of speakers - Fisher XP65s. A decent 3-way design. Bose is headquartered in Framingham, a few miles from my current house and not too much further from where I grew up. I really wasn't aware of the original 901 (series 1) but in college a friend had a brother in-law that was a manager and we were able to go for a tour when the series 2 was being made. I was able to get a pair for cost. I liked them but my 45wpc amp did not and soon bit the dust from severe clipping. Moved up to a 150wpc Carver receiver. Back then loud was good. As Gene K said, its hard to find a room where the boundaries are perfect for them. Some time after college I bought my first home and it had a play room in the basement and I hung them from the ceiling. Damn near perfect for them. Soon after one of the speakers developed a buzz. I took it to the repair center not too far from my home. By the time I got home they had called and found the problem. Unfortunately they used drivers destined for the series 3 that had foam surrounds not the cloth surrounds that last forever. This happened near the end of the series 2 run. It was ~15 years after purchase and Bose gave me a choice: (1) install new drivers (18) at a cost I do not remember or (because they, Bose, felt somewhat responsible) I could get a new pair of series 6 for cost - $350. This, I thought, was a great deal as it was much less money than replacing 18 drivers. I did not like the series 6 too much. The highs were a bit better but the bass suffered as a result. I kept them for a number of years and got tired of occasional port chuffing and sold them after picking up a pair of series 2. I had DHS Speakers rebuild the EQ with Sonicap and silver mica capacitors and some new resistors and a few other components. The speaker service claims Bose used cheap components back in the day and many of the high signals were unable to pass thru. The difference is very noticeable BUT they still don't have the detail of my AR speakers. Out of all my speakers everyone wants to hear the 901's. The bass is not as deep of a bass as my 9's or 90's but is easy to get/hear at low volumes. Everyone, upon hearing them ALL say "my God, the bass". I had one guy walking around the room looking for a sub woofer. They work well with watching movies and I listen to them every Sunday morning. The current family room is very narrow and long and getting them set up as designed would be impossible so I just turned them around and have them direct on one face and reflect off a wall on the other face. There is something about listening to a full range driver (to me anyway). I always want to have a pair. They are not for everyone. As for the highs keep in mind most males were never able to hear 20kHz and as you get older most of us top out at 15kHz or lower. All tuners top out at 15kHz. There just isn't much music up there beyond that. It's more about the lack of detail. I recommend the EQ rebuild for anyone who have a pair. <edit:add> An after thought: they are insensitive to power as long as it is clean. I had a modified Carver amp (M1.0t Mk2 Opt2 with 460wpc) where a transistor that was part of the mod 'let go' and allowed 70VDC to hit one of the speakers (ser6) and reset and do it again. The speaker/drivers suffered no damage. They are tough to kill and will last years if cared for.

Here's another link mostly about Bose but it has a small section on the AR9. https://www.audioholics.com/editorials/bose-conundrum I think this article was written by a CSP member.

For a comparison there's a nice looking pair for sale on Craig's List in Nashua NH for $3999 with s/n 0633 and 06638.

Here's another list: https://www.audioholics.com/loudspeaker-design/most-influential-speakers

ALL TUBES HAVE BEEN SOLD Thanks for looking.

Emotiva has several well built subs and you have a 30 day in home trial period. They have a You Tube Channel with videos that feature some of the subs. https://emotiva.com/collections/subwoofers

What brand of capacitors did you use?