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In Reply to: RE: AR-2a Question posted by john5 on May 13, 2017 at 11:17:09
Could the potentiometer positions have changed in the meantime? that's a wild guess on my part but possible.
Also it's a good idea to set the potentiometers for the mid and treble at full on. The mid point, usually thought of as flat was set below the woofer level to ameliorate what AR thought was poor treble on recordings. Besides you will only be affecting response above 2 kHz. That's where the dual 5" 'mid ranges' rolled in. Today that's often the crossover point for a 1" dome tweeter. And, of course, the mid ranges on the AR-2a were the tweeters on the AR-2. The dome driver is more a super tweeter.
I actually bypassed them, but without taking the old pots completely out, so the controls are essentially useless now.
I'm honestly thinking after pondering this all day that the difference came when I reinstalled the grille cloth - the sound was nice and balanced on top without it but I suspect maybe the top end is on the weak side and the cloth is just muffling it enough to bother me? I don't know, I'm hesitant to pull the front back off just to see but it's about the only thing I can figure out might've caused the difference.
If I recall correctly(it was about 50 years ago) you have to rip the grill cloth off. I changed my AR-2a to AR2-ax speakers with a $10 kit from AR and I kind of recall tearing off the old grills and nailing(?) on the new grill cloth which was part of the kit.
I had a pair of 2ax's new back in the 70's. Getting off the grills without destroying them was difficult but possible. I used a wide metal spatula to gently pry the grill frames off. Yes, they were nailed to the fronts of the cabinets.
You can probably find the "new" midrange unit with which they replaced the two mid-tweeters. I recall Henry Kloss had a low opinion of those drivers.
I had a pair of AR2ax that I got rid of because the potentiometers were driving me nuts and I didn't have the skills to do surgery.
I also had a pair of KLH6 which sounded great with a PAS preamp into a Rotel ss poweramp and a Marantz CD63se. The PAS still had tone controls and by goosing them a bit I could get a magnificent sound out of the Chess Chuck Berry collection on CD!
It's never too late to turn back the clock.
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