OBI56

Hillarious! http://www.etsy.com/listing/67666807/iracket-v3

All I remember about them is that they were OEM'd by JBL back in the 60s and were mostly used in commercial environments with Ampex RTR tape recorders in small movie houses and clubs.

¨The MMGs look SOOOOO much better in black Steve but the 3.6s do indeed look like something my son would have done without me looking over his shoulder.

Nice job Steve

Overall Speaker Performance 5 Overall Speaker Quality 5 Value For Money 5 Reliability 5 Factory Technical Support 5 (a small plastic shaving inside the power connector dignosed within 60 seconds over the phone) Factory Service Ease of Doing Business With Your Dealer 5 Ease of Doing Business With the Manufacturer Distribution Network Dealer Knowledge 5 Technical Innovation 5 Product Availability 5 Brand Currently Owned: Martin Logan Source Next Speaker Purchase: Why would I buy another speaker?

Welcome to the forum Sanford. You are safe here within our growing Carver powered ML owners community. I have the Sources and even my mother who hates anything stereo absolutely loves the way they look in my Bauhaus livingroom. Modern art indeed that also happens to sound incredible. Your wife has good taste!

My HT system is rather punk compared to most of yours; I use a matched set of Quest 5.1 aluminium HT speakers with the matching subwoofer. You can see the fronts and centre between the MLs and the sub way off tot he right side. Upgrading to an all Polk system later this year.

It doesn't take much in a "partition farm" full of open cubicles to get really noisy and any sort of personal privacy is all but impossible. All it takes is one loudmouth on the phone and everyoen else has to raise their voices to make themselves heard on the phone and then things get really crazy. It seems to be getting worse as time goes on and finding an partitionned office that is relatively quiet is all but impossible.

Pretty good guys! The technology is in fact a servo feedback amp. 3A first came out with it in a mass market bookshelf speaker, the Andante 40 and 60 (using a small horn tweeter) in the early 70s, closely followed by Philips of Netherlands. Philips used a piezo sensor to apply the feedback whereas 3A used a seperate feedback winding to measure the voice coil excursion and apply a correction signal through the internal servo amp allowing an almost flat woofer output. 3A then came out with the Master Control which is shown in the original pic. They next came out with a large floor standing model using a 15" woofer called the Master Control Studio (pic below, frequency response 24-35KHz +/-2db) and then the compact Ultra Linéaire with an 11" woofer and a dome super-tweeter replacing the ribbon. The next step was the Triphonic system which used 2 tiny satellite speakers and a large, coffee table subwoofer with either 3 or 4 woofers. These were particularly striking as they were styled to be elaborate furniture with hand rubbed finishes; one model of note was even done up in Chinese gold Cloisonné and burgundy or black laquer (wish I could find those pictures for you). Infinity did come out with a servo woofer design in 68 that used an internal microphone to supply the signal to be corrected by the amp, but it proved so unrelaiable that they had to do a complete redesign and eventually gave up on the technology before coming out with their better known and loved designs of the day The ServoStatic was a hybrid electrostatic/ribbon/subwoofer design. It was very high end, expensive speakers well beyond the price points that 3A and Philips were at.

No guesses guys? OK, time for a hint: It is French and the reason it is so heavy is that it was one of the first speakers to have a built in 150W amp,b ut the amp was not used to actually power the speaker ...... This technology has recently reappeard in high end subwoofers to make them more musical.

I get pretty decent sound using my Stax SRM212 headphone amp hooked up directly to the output of my NAD CDP adn my Stax SR-202 headphones. Stax also makes a cute portable version of its electrostatic headphones wit a tiny headphone amp that you can hook up to the back of any CDP or preamp. http://www.yamasinc.com/sr-001mk2.htm Another possibility is getting a good, but inexpensive DAC and hooking that up to your CDP and phones.

Closer Snow, right continent this time. Just follow the clues I left already. BTW, I remember dozens of British 3 way speakers from IMF, Celection, KEP, B&W, Spendor and Linn for example.

Not even close Snow. Wrong country, though I have to admit that they sounded pretty much like the huge old Infinity Reference Vs!

Here is another unusual one for you guys. Not only did it feature a ribbon tweeter but something far more important in terms of technology. The woofer is a 10" unit with something special inside and the total enclosure volume is under 1 cubic foot, weighs about 50 pounds and can reproduce bass down to 24 Hz with a 3db down point and way out past 40KHz.

That's it Rich! The original plasma tweeter was called the Ionovac and, as per the picture attached, was horn loaded. It was used in several large high end speakers by DuKane, Telefunken and Audax. DuKane also made a tweeter only version for hobbyists to put on the top of their existing speakers. The one in the photo is actually called the IonoFane and was a copy of the original DuKane Ionovac by Fane Acoustics. ElectroVoice had what is probably the most widely distributed version in certain versions of the Partician loudspeaker. Form the 60s onward, development went in 2 different directions; one being the Magnat massless plasma tweeter the other being the Hill Plasmatronic.

OK, here goes. Invented in France, it was later redevelopped by an American and later, in its ultimate form by the Germans. It is a tweeter and was used in several high end speakers back then. It was a "glowing" example of technology in its day!

Geez, no one wants to guess??? Do I have to give you a SECOND clue?

Nope on both counts! More like a French horn .....

GRRRR!!!! OK, lesson learned..... Harryfan didn't cheat; I was just dumb. BTW, the B&W DM-70 was one of the first successful hybrid electrostatics. So, lets try this one and cheaters beware ..... :d/ This one was both a success and a failure.

DAMN YOU BALOK!!!! :dd :dd :dd I thought this one would be harder! The B&W DM-70 OK then, here is another one for you guys. and no, it is NOT a liquor cabinet!

OK, I like this game, so here is another mystery speaker for you guys to identify.

Nope, this is what the Voice of the Theatre looks like:

Balok, you should read THE definitive dicument on record cleaning published by Cecil Watts back in the 60's. It actually recommends a solution of distilled or non-hard water with a few drops of photo wetting solution to clean records. I'd avoid alcohols as they can attack some of the plasitizers used in making records rendreing the vinyl more succeptible to damage. Alcohols also have the nasty tendancy of leaving a film or slurry of contaminants in the record grooves which gets ground into the grooves by the stylus. Rich should have a copy of this on file somewhere or I can e-mail you a copy.