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Help me restore these PhaseTech PC60s

Just wanted to update this quickly before bed. In short, these are incredible speakers for their size.


I got the woofers earlier this week from MSE / Phase Tech, and they looked perfect (even threw in a T-shirt, which is cool). Exactly the same as the originals, except now the surrounds and the front foam was perfect. They fit right in, no fuss.

I didn't even have time to fire them up. Took them right to my dad's this weekend and then hooked them up with him to a Luxman R113 in the basement.

Our first impression was immediately positive. They were very clear and detailed. Highs and vocals sounded pure. The bass actually could reach surprisingly low, but just wasn't as powerful, which for a speaker this size was expected. The bass could be brought up to decent levels with some adjustment on the amp. The only downside to these PC60s is that they are not very efficient (87 dB SPL) and are 4 ohms. So the little R113 had its hands full (I was able to push it to distortion) as did the R-351 in the living room, but they still did a decent job. We did A-B comparisons with a bunch of speakers (I brought a bunch with me lol).

The imaging of these is quite incredible. Down in the basement (a very large, wide open space) the PC 60s did a great job with imaging and had a good soundstage at about 7 feet apart. What surprised us was stepping back from them about 16-19 feet provided an awesome acoustic zone where the bass was very satisfying. Really deep, strong, yet tight. Must be the acoustics of the room.

We A/B compared them against some Boston CR7s, CR6s, Mission 770 MKVs, and some EPI 1200s I brought for him for basement workbench use. The Missions are pretty much our benchmark for new speakers since they are really fantastic all around, and these little PC60s at half the size really sounded great next to them. I think they actually image slightly better. The PC60s blew away the CR7s in detail and clarity. The CR7s have more bass. The CR6s actually sounded better than the CR7s in terms of highs and detail, but the PC60 still easily bested it. The EPIs sounded great with a fuller sound due to their size, but something about the PC60s make them just sound more musical than the EPIs.

For the Mission comparison, we played the two in the basement and up in the living room. It was a close match in the basement. The 770s just had more down low. But the detail and clarity up high are about equal it seemed. Both imaged fantastic and had a good soundstage in the basement. But, up in the living room, the PC60s imaged tremendously well. When standing back about 15 feet away (speakers were 6'2" apart and pointing straight out) the PC60s "disappeared" and made it sound like everything we heard in the room was just emanating from the wall. They were clear, accurate, and pleasing to listen to. They unfortunately, were hooked up to a Lux R-351, which I wasn't sure was rated for 4 ohms, so I didn't want to push the amp too much (I left all of my gear at home). The Missions sounded fantastic as usual, but they didn't quite "disappear" as the PC60s did, although they did on some songs.

Overall these are incredible speakers. According to my dad, "They are the best speakers for their size I have ever listened to." I love them and plan to hold onto them. I can't wait to hook them up to my Luxman R-115 and Sansui 7000. Those should help make them sing!
 
Thanks! I'll try to get up some pictures. They look great with the oak finish and new woofers. I'm going to keep the original brown grill fabric on there for originality's sake.
 
A word of caution to anyone with 3M adhesive. If any 3M adhesive gets on the foam portion of the woofer (the main piston/cone) it will eat away the foam like acid.
If you want to put a cover material over the cone face, like foam liner use a gentle glue like aileen's tacky glue or other.

-Herb
 
A word of caution to anyone with 3M adhesive. If any 3M adhesive gets on the foam portion of the woofer (the main piston/cone) it will eat away the foam like acid.
If you want to put a cover material over the cone face, like foam liner use a gentle glue like aileen's tacky glue or other.

-Herb

i took a lot of care to prevent that from happening, mainly because I did not want to get it on the on the styrofoam piston or the new surround.
 
I wanted to update this thread for those that want to replace rotted surrounds with rubber surrounds themselves. After some critical A/B listening with the surrounds that I replaced mentioned earlier in this thread I can honestly say that they sound equally as good as new drivers from the manufacture. So have at it. I have tried combinations of surrounds that I replaced with the new drivers in the opposite channel. There is no difference.

It is difficult to replace the surrounds, but not impossible. Just do everything very very patiently. Do it right you save some dough and get a high level of satisfaction. Get it wrong, and you have to buy you woofers from the manufacturer.

The spray-on adhesive to protect the foam on the piston from entropy is working fine as well.

Link for surrounds:

http://www.ebay.com/itm/361996484877
 
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I didn't read all of the responses, but I restored a pair of these a few years ago. The foam on the piston was all chewed up. I removed all of the old foam including the surrounds. I replaced the surrounds and on top of the inner lip I used closed cell foam that I think might have been some type of insulation. I don't really remember. They came out real nice and sounded fantastic. Of course, that was maybe 100 sets of speakers ago. The old guy I sold them to was extremely pleased.
 
I didn't read all of the responses, but I restored a pair of these a few years ago. The foam on the piston was all chewed up. I removed all of the old foam including the surrounds. I replaced the surrounds and on top of the inner lip I used closed cell foam that I think might have been some type of insulation. I don't really remember. They came out real nice and sounded fantastic. Of course, that was maybe 100 sets of speakers ago. The old guy I sold them to was extremely pleased.

They are a nice stand mount that do a lot well. Quite surprisingly, they bested several much more renowned small loudspeakers I've had.
 
I'm trying to decide which way to go on these, picked them up for free in great shape with the PC50. Are the replacement drivers the same or new versions of the originals? And the soft material on the front of the cone, how much affect does it have? I'm leaning towards new though, and perhaps doing the crossover, something I have not done before. I can say even with bad woofers they already impress.
 
Call the company for info on the replacement drivers they are easy to get information from great customer service. Be prepared it is a tough job working on the crossover. Be prepared to come up with some creative ways to remove and re-install. Theses are sweet sounding bookshelves and worth the effort to restore.
 
I'm trying to decide which way to go on these, picked them up for free in great shape with the PC50. Are the replacement drivers the same or new versions of the originals? And the soft material on the front of the cone, how much affect does it have? I'm leaning towards new though, and perhaps doing the crossover, something I have not done before. I can say even with bad woofers they already impress.
New versions, but very similar. Absolutely do the crossover, I did on my PC60's and 80's and it made a big difference. They used a lot of caps.
 
I'm trying to decide which way to go on these, picked them up for free in great shape with the PC50. Are the replacement drivers the same or new versions of the originals? And the soft material on the front of the cone, how much affect does it have? I'm leaning towards new though, and perhaps doing the crossover, something I have not done before. I can say even with bad woofers they already impress.

A few years ago I sent my disintegrating PC65 woofers to Phase Tech and they came back looking exactly the same except with new surrounds and piston (or just the foam on top of the piston? not sure). If they sent me all-new drivers, they were nearly identical. And the speakers sound wonderful. Although the factory service is not cheap, it was worth it to me to have them repaired precisely.

And hats off to the folks here who have successfully repaired their own Phase Tech woofers.
 
Think I will go new drivers, although I’m likely going to not do the sub as I like my outlaw sub quite a bit, and makes it easier to swap out speakers if I just have one sub to adjust. But the curiosity of how the sub sounds may win out.


I have not done a crossover before, but can solder well enough. And the capacitors are right there to use for reorder, not sure what brand, are they worthy of topshelf what ever that may be today? Oh and how did you solve the large board issue, just cramp your hands in the cabinet?
 
I'd use Solens for anything under 10uF or so. I think the board comes out with the removal of a few screws, but that might only be on the MKii's.
 
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