DavidR
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Everything posted by DavidR
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Forget it yeah
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Hadn't thought of it and not sure how to go about it. If it requires unsoldering all the wires then F it.
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Old and new cap and resistor readings:
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The phono box sat half done for a longtime. I had a bad slip and fall on ice while walking the dog just after Xmas. Landed hard on my pelvis. Was in bad shape for a while and then mega-bursitis hit my left shoulder requiring cortisone shot. I don't know if you can see it but the box has a sliding plexiglas cover. Much better than stuffed into cubby holes in my desk.
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Thanks. So far the bass is GREAT! When I'm done I'll post old and new cap and resistor readings.
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Got one done - FINALLY! I finally got around to the 10Pi speakers. I had to get some other things done that have been on the bench. One was a box I made for my phono cartridges. The AR10Pi xovers were difficult because of limited space and a LOT of wires. I had to do it in steps as I use goop to hold down the caps and resistors. So it was glue one or two pieces and come back tomorrow to wire and solder. I guess I got the wiring correct as it WORKS!!! The reason for the piece of blue tape at the end of that red wire in the center is because its supposed to be blue according to the schematic. I noticed that the 100 and 2500uF can caps had a PLUS (+) mark at one of the two terminals. As they are NPE caps I was wondering if this indicates either the inner or outer foil? Some of the screws were rusty so I picked up some stainless steel screws AND they were a bit cheaper than (a few pennies less) than the black oxide. Now it's off to do the second speaker. Oh, and they got new 5-way binding posts.
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Stimpy, There's a pic above of the xover. I'll hold onto the one that tested OK and when I get to the 9's I'll see how those measure. Maybe I will find one good and one bad there too. I have no idea how good or bad the Bennics are compared to a Callins. Very hard to work on the 10Pi. Lots of wires and little room between points on the terminal strip. My eye sight is poor and that doesn't help. One step at a time right now. Got the 15 ohm resistor replaced and waiting for the goop to harden. Will solder it tomorrow and then on to the 40uF cap.
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Never mind. I pulled the 2500uF cap from the other speaker and it measured over 2840uF. Moot point now. Both are being replaced by a bundle of large Bennic caps.
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I got the 2500uF unsoldered and measured it with my Agilent U1733C at 100 and 120Hz. It will not measure that size at a higher (i.e. 1kHz and above) frequency. OLD 2500: 2465 @ 100Hz; 2462 @ 120Hz NEW 2500 bundle: the 3 caps measured at 1kHz added up equal 2417uF and measure 2429 @ 100Hz; 2426 @120Hz. Based on this data the old 2500uF is still good. Should I use the new ones or go with the old one?
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I finally began to work on the xovers in my 10Pi speakers and it didn't take long before I ran into an issue. Attached is a picture of the xovers and the 100uF has a black and red wire on the same terminal. WTF? This red wire comes from the terminal board and goes over to the cap and then the transformer. I've looked at some diagrams people have posted and it does show a blue wire. Do you think they just used the wrong color?
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MY HT doesn't incorporate surround. I use the 901's for the rear speakers and run them on it's own amp. The fronts are run off a separate amp. I think they are great rear speakers for the rumble they can create. YMMV
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Dave did mine as well. I wanted all resistors changed to 1% metal film but he wouldn't do it. He did change 2 in the audio signal path. I also would have preferred something other than Sonicaps but that's what he likes to use. BIG difference in SQ; especially treble. Did you ever A/B your ported 901's to the acoustic?
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^^^ Was beginning to wonder if you'd post on this. ^^^
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I'm not sure about the "deeply"; especially with the acoustic versions.
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AR Demonstration Room in Grand Central Station Photo
DavidR replied to bellhead's topic in Acoustic Research
Every time a kid touched it. LOL -
Yeah, but I bet the sales of units doesn't come close to the 901.
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5:15 am today !
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My wife and I want to relocate and are now only looking at houses in areas that have all underground utilities and no big trees near the house. We will also have a Generac whole house generator. I'd never run an amp off of a generator. Dirty power and tend to run at high voltage - 130v to 150v.
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Lost power. Had a bad storm - heavy wet snow. Lots of trees, limbs and power lines down. Stealing a bit of power from the generator that is running essentials. Will be back once power is restored. Could be days they say.
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I spoke with a buddy that has an electrical back ground so I guess I'll answer my own questions. The 20uF capacitor is open circuit (not in use) when the woofer switch is in the 4TT position. But is in parallel with the 100uF in the other 2 positions. It is lowering the cap resistance. Just like when you put (2) 10 ohm resistors in parallel you get 5 ohms and when you put (2) 10 ohm resistors in series you get 20 ohms. It's at the top end of the 10% tolerance and probably would be OK but I'll see if they have any that measure low.
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From the AR9 Manual>>>>>>>>>>>>>>>
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Dave @ DHS Speakers? or the guy on AK (forget his name at the moment)?
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I'm starting to make an order list of caps and resistors for the 10Pi speakers. I'm going to use all NPE caps and the only one that is an issue finding is the 20uF. I can get 18uF and 22uF but NOT 20uF. This cap appears to be a woofer shunt cap that can be added, via an attenuation switch, to the 100uF cap. I'm not sure at what switch position the 20uF comes into play. I want to run the woofers in the 4TT position. > Does anyone know if the 20uF is in the circuit when 4TT is selected AND will the 22uF be OK to use? > Also, what is the 10 ohm resistor doing to the xover circuit where they put it across (parallel) the cap leads of the 2500uF cap?
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Like 'em or not the 901 was the largest selling speaker ever. I prefer the acoustic suspension models way more than the ported ones. Even though they don't have the detailed treble and nicely defined bass of my big AR's there's just something about listening to a full range driver system. I found recapping the EQ with modern day electrolytic, film and silver mica caps will enhance the treble range a lot.
