Just got these RTA 12B’s.
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Still rocking my Model 10’s with 0194’s.
John -
No matter how you slice it, they are a huge improvement over 30 year old electrolytics.
You will very much enjoy the 12b.
Looking forward to it.
John
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George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Maybe that's why they were prone to auto-combustion on the track.Don't take experimental gene therapies from known eugenicists. -
Desmodronic.
Cam open cam close.
Lots of shims.
Jingly cam chain sounds.
John -
Ok. So I got my new MT-4115 Peerless repos. They look very nice.
Now, +/-
My original tweeter has the hf out (White wire) going to the unlabeled terminal on the tweeter and the ground (Black wire) going to the red terminal. The new tweeter only has one terminal denoted as red. In my mind that’s + no?
Help!
John
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On your Polk (Peerless) tweeters, the black wire is positive and the white wire is negative. Red on the tweeter terminal denotes positive. I sincerely doubt that in that Peerless Replica speaker you bought they would have undone that convention, although who knows? They seem to have had no problem with reversing the side that has the red terminal.
There is a way to check. If you connect a AA battery momentarily to the tweeter with a strip of tissue paper on the dome you should see the dome move outward if you have the polarity correct.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Tweeters on the RTA12's are connected out of phase to correct the phase reversal in the crossover. Black should go to negative and white to positive... UNLESS the wires were desoldered from the board to "correct" what Polk had originally.
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Thanks guys. I can never remember the way they are.
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Tweeters on the RTA12's are connected out of phase to correct the phase reversal in the crossover. Black should go to negative and white to positive... UNLESS the wires were desoldered from the board to "correct" what Polk had originally.
Interesting.
John
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Yes, a PITA everytime I work on them. -
More than likely Polk maintained the convention of connecting a black wire to the + terminal on the tweeter but at some point on the XO a white wire effectively connects to a black wire. Just my guess. On the binding post you probably still have black to red binding post (+) and white to black binding post (-).George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Gardenstater wrote: »More than likely Polk maintained the convention of connecting a black wire to the + terminal on the tweeter but at some point on the XO a white wire effectively connects to a black wire. Just my guess. On the binding post you probably still have black to red binding post (+) and white to black binding post (-).
Look at the schematic it plainly shows what I'm referring to.
Black wire goes to negative on the tweeter and white to positive.
The correct way to hook up tweeters on the RTA 12's is as I just described.
Yes the binding posts are correct black to positive white to negative, the signal gets reversed 180° in the XO to correct that you hook the tweeter out of phase to correct the shift. -
Question.... why would all the caps be on the negative side anyways?
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Yeah I know but clearly Polk soldered the black wire to the + (Red) terminal on the Peerless. He needs to trace those wires on the tweet back to the XO and make sure that it is correct as per the schematic. That way he will determine if anything is amiss.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
Here you can see the white wire coming from the high out and the black coming from the high ground.
John -
"Look at the schematic it plainly shows what I'm referring to.
Black wire goes to negative on the tweeter and white to positive."
Actually the schematic doesn't designate wire colors after the XO, only between the connector and the XO. So what I am saying could very well be true, specifically that effectively a white wire from the connector could effectively be connected to a black wire between the XO and the tweet.George / NJ
Polk 7B main speakers, std. mods+ (1979, orig owner)
Martin Logan Dynamo sub w/6ft 14awg Power Cord
Crown D150 amp
Logitech Squeezebox Touch Streamer w/EDO applet
iFi nano iDSD DAC
iPurifier3
iDefender w/ iPower PS
Custom Steve Wilson 1m UPOCC Interconnect
iFi Mercury 0.5m OFHC continuous cast copper USB cable
Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
Custom Vibration Isolation Speaker Stands and Sub Platform -
I think I understand.
John -
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Hook them both up the same way on each side and listen. Try it the other way around. What way did you like em best ? That is the way they should be my man !! If you can tell the difference I will send you a dollar. Just joking.
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Got all my stuff.
I thought I had some solder braid but I don’t. I’ll have to order some. Maybe some new binding posts too.
John
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Nice man. You are going to like them a lot.
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Nice, very nice.
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Nice, like someone said, ANYTHING film is better than old factory heat sinks. Are the Clarity SA's worth a try on the tweeter circuit? Or just get the CSA's that a lot of members are using?Don't take experimental gene therapies from known eugenicists.
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We'll find out eventually. I have to go to work next week or so. I’ll tackle it when I get back. Need to order some of that low temp solder and some solder braid. Maybe some flux. While I’m at it maybe some new binding posts.
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One down. On to the other one. Seems like another big improvement.
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They look oddly familiar
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I always thought having that crossover on the outside, on the very top of those speakers was just about bad @ss as all get out.
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I always thought having that crossover on the outside, on the very top of those speakers was just about bad @ss as all get out.
Me too but wait! There’s more inside!
John
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I think the Banana song in Beetlejuice is going to sound good tonight.
