Infinity Reference Threes - Refoam or Not? - AVS Forum
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post #1 of 13 Old 01-26-2013, 07:39 AM - Thread Starter
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I'm temporarily staying with my folks while renovations are being done on a new home. I was rummaging around in my Dad's basement last night and came across my old pair of Infinity Reference Threes:
Quote:
PRODUCT SPECIFICATIONS
Frequency Response 47Hz - 25kHz
Crossover Frequency(ies) 400Hz and 3.5kHz
Sensitivity 90dB (1 watt/1 meter)
Nominal Impedance 6 ohms
Power Rating 20 - 125 watts
Woofer 8" (20.3cm) IMG
Midrange Driver 5" (12.7cm) IMG
Tweeter 1" polycell

Here they are. Note the damage to the foam around the woofers:







I remember trading in a set of Pinnacle PN50s (with the diagonal duct) for these Infinity speakers when I was a junior in high school. They lasted me all the way through college, and as I remember, sounded really nice.

So I did a little research and saw that for $30 or so, I could get a re-foaming kit for them. Think it's worth doing? Not sure if I'd keep them or sell them, but it would be nice to get them running again.

Also, it's been a good fifteen years since these have been hooked up and played. I don't really want to spend any money on these if they aren't operable. Can I hook them up as is -- even with the foam issues -- just to test them out before going to the trouble of repairing the foam?

Thanks!!!
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post #2 of 13 Old 01-26-2013, 07:48 AM
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Trying to replace or repair that foam surround yourself is not going to work. It requires an entire new surround to be properly aligned and cemented with the right materials.

You need to find a professional with extensive experience and special expertise to do it properly, or the result will very likely be a disaster.

Search for speaker reconing or speaker rebuilding and find someone who knows what they are doing.
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post #3 of 13 Old 01-26-2013, 08:19 AM - Thread Starter
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Worth doing?

And what would happen if I just hooked them up and played them as is?
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post #4 of 13 Old 01-27-2013, 05:35 AM - Thread Starter
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Well, I gave them a try last night. They sounded like crap at first, but they seemed to warm up and ended up sounding pretty decent. I think I'm going to take the plunge and try the re-foaming kit out. What have I got to loose? They were just collecting dust before anyway.

If anyone has any tips on re-foaming or resources they've consulted in the past, please send them my my. Thanks!
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post #5 of 13 Old 01-27-2013, 01:05 PM
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Quote:
Originally Posted by commsysman View Post

Trying to replace or repair that foam surround yourself is not going to work. It requires an entire new surround to be properly aligned and cemented with the right materials.

You need to find a professional with extensive experience and special expertise to do it properly, or the result will very likely be a disaster.

Search for speaker reconing or speaker rebuilding and find someone who knows what they are doing.
you are so full of crap. Reforming speakers is easy, I've done plenty and its easy to get the cone entered properly. To the OP, it's very difficult to get the right foam surround for the midrange drivers, the woofers are readily available. I have a pair and I have tried several sets for the mids and none of them fit. One guy near me said he uses a surround with a W fold instead of the normal single roll. I don't know where he got them though.

Dumb enough to spend lots of cash on this junk!
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post #6 of 13 Old 01-27-2013, 01:10 PM
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Quote:
Originally Posted by Kurth01 View Post

Well, I gave them a try last night. They sounded like crap at first, but they seemed to warm up and ended up sounding pretty decent. I think I'm going to take the plunge and try the re-foaming kit out. What have I got to loose? They were just collecting dust before anyway.

If anyone has any tips on re-foaming or resources they've consulted in the past, please send them my my. Thanks!

You can find videos on youtube if you search for them. I did my first refoam on a pair of Kef 104/2 speakers which have both an inner and outer surround on the woofers. Turned out fine. You just need to take your time. Your speakers will be easier than the Kefs.

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post #7 of 13 Old 01-27-2013, 08:18 PM - Thread Starter
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Thanks for the helpful posts! Just ordered a reforming kit from eBay. It apparently comes with surrounds for the 8" woofer and the 5" mid. If so, I'll probably replace all. I'll post results, hopefully next weekend.
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post #8 of 13 Old 01-28-2013, 01:58 PM
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Can you provide me with link to the kit? Also, let me know if the mid surrounds fit. Thanks!

Dumb enough to spend lots of cash on this junk!
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post #9 of 13 Old 01-28-2013, 05:13 PM - Thread Starter
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Quote:
Originally Posted by flyng_fool View Post

Can you provide me with link to the kit? Also, let me know if the mid surrounds fit. Thanks!

The link to the kit is in the OP. Should arrive by Wednesday. I'll let you know how it goes.
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post #10 of 13 Old 01-31-2013, 08:40 AM - Thread Starter
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Well, I tried the re-foaming last night. Everything worked like a charm, but then I noticed that one of the woofers seemed much "looser" in the assembly than the other. Upon inspection, it looks like the cone/voice coil former has separated from the suspension/spider. I think I'm using those terms correctly, but here's an image to illustrate what I mean:




Basically, instead of the suspension (also called the "spider" or so I'm told) being attached to the cone (or maybe the voice coil former?), it's come apart, and the cone just sits in there now.

Am I screwed? I'll be bummed if I just spent $30 on this re-foam kit for nothing. Any chance I could reattach with super glue? Any other tips or suggestions?

If this woofer is shot, is it worth getting a replacement? Thoughts?
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post #11 of 13 Old 01-31-2013, 08:54 AM
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It can be regllued no problem.

Dumb enough to spend lots of cash on this junk!
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post #12 of 13 Old 01-31-2013, 01:15 PM - Thread Starter
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Quote:
Originally Posted by flyng_fool View Post

It can be regllued no problem.

That's good news! Thanks. Any tips on what kind of glue to use? Super Glue? Epoxy? Anything I need to watch out for?
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post #13 of 13 Old 01-31-2013, 01:30 PM
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I have not used it but some folks recommend this:

http://www.simplyspeakers.com/speaker-repair-adhesive-mi-1500.html

Dumb enough to spend lots of cash on this junk!
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