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Are all emit diaphragms the same

tomlinmgt

tomlinmgt

Lunatic Member
I have one blown emit from the pair of RSM's I'm restoring. I see several different versions of the emit tweeter with round and rectangular faces but it looks like they all have rectangular diaphragms. Are there any speaker models that have an emit diaphragm that is interchangeable with the ones in my RSM's?
 
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anything made before the Kappa series, i believe, should have the same exact diaphragm, at least functionally. at that point, i believe they switched to Kapton film from something else that was a bit heavier (although i could be remembering something wrong here).
 
I am watching with interest as I am doing the same thing tomlinmgt. I have a buzzing emit myself. I can see a small hole, the size of a small pencil point, in the silver film through one of the slits. It sounds fine until I turn it up and then a little buzz. Maybe I can take the face off and silicone the small hole from the back????? I have a line on another square emit and if I can just swap the 2 that would be good.
 
Yes, most Infinity EMITs use the same diaphragm, part #751-3722. The exceptions are:

  • EMIT-r (round diaphragm)
  • SEMIT (Kappa 9 supertweeter uses a smaller rectangular diaphragm)
  • High Energy EMIT (Renaissance 80, 90, and some IRS models)
  • EMIT-k used in the RS-4000 and RS-5000 (smaller rectangular diaphragm); all other EMIT-k's are compatible
  • QLS-1, Quantum 2, and Quantum 3 (longer, narrower diaphragm)
Don't look so much at the shape of the face as the shape, size, and alignment of the slots/openings in the tweeter. Some EMITs have an overall rectangular external appearance (such as the Quantum series, RS-1B, RS-IIb, and IRS-V) while others have round faces (think 80's RS-series or Series 1 Kappa's) yet all of these use the same diaphragm. As an example, I harvested a diaphragm from a Kappa Series 1 EMIT-k tweeter and used it to restore a square-face EMIT in my RS-IIb's.

If you have any doubts about what diaphragm your speakers need, download a tech spec sheet from the Infinity Classics website.
 
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How about the emits in the Q series speakers (Qe, Qa) that have the rectangular outer frame superimposed over the round face? Are they compatible with the RSM emits?
 
Qe emit is a rectangular regular Emit, same as Qa and Qb and others, just mounted in a circular plastic piece. I bought 2 Qe emits to fix my Qb's. Part number is the same.
 
tomlinmgt said:
How about the emits in the Q series speakers (Qe, Qa) that have the rectangular outer frame superimposed over the round face? Are they compatible with the RSM emits?
Click to expand...
The Quantum-series speakers listed in my post above use a different diaphragm. All the other Quantum models use the same diaphragm as the RSM's.
 
Tedrick said:
Yes, most Infinity EMITs use the same diaphragm, part #751-3722. The exceptions are:

  • EMIT-r (round diaphragm)
  • SEMIT (Kappa 9 supertweeter uses a smaller rectangular diaphragm)
  • High Energy EMIT (Renaissance 80, 90, and some IRS models)
  • EMIT-k used in the RS-4000 and RS-5000 (smaller rectangular diaphragm); all other EMIT-k's are compatible
  • QLS-1, Quantum 2, and Quantum 3 (longer, narrower diaphragm)
Don't look so much at the shape of the face as the shape, size, and alignment of the slots/openings in the tweeter. Some EMITs have an overall rectangular external appearance (such as the Quantum series, RS-1B, RS-IIb, and IRS-V) while others have round faces (think 80's RS-series or Series 1 Kappa's) yet all of these use the same diaphragm. As an example, I harvested a diaphragm from a Kappa Series 1 EMIT-k tweeter and used it to restore a square-face EMIT in my RS-IIb's.

If you have any doubts about what diaphragm your speakers need, download a tech spec sheet from the Infinity Classics website.
Click to expand...
Hi Tedrick,

I think, you forgot the Semit from the Beta / Gamma. Then I would say, that the Quantum 2 has a rear Emit (quad form).

Klaus
 
Alright, so I got an EMIT from a Q series....black face with superimposed polished rectangular face...the diaphragm/magnet assembly is not the same as the RSM. I went ahead and mounted it as the screw holes lined up and had a chance to hear my RSM's for the first time. I was very, very impressed initially listening to Allman Bros Live at Fillmore. But, as I played more material through them and compared them to a set of Polk Monitor 10's they kinda lost their luster. Not that the Polks are that much better...just seems like the Infinities don't stand out. The bass is tight, midrange up front and clear, and highs are...well, you all know what EMITs can do and now I do too. I need to play with positioning. My first listen was with them about six feet apart and one foot off the floor and tilted back just a hair. When I compared them to the Polks I moved them further apart....probably eight feet. Seemed to take a little away from them.
 
I moved the RSM's closer together (back to about 6.5' apart) and I prefer that spacing better than the 8' spread. I really am coming to respect the RSM's for a number of attributes. The Polks are more exciting initially, but they are perhaps a bit less, oh, I don't know...balanced is maybe the word I'm looking for. The RSM's maintain their composure better at higher volumes than the Polks...especially in the lower frequencies, so that's a definite plus. These really are very nice. If this is just a morsel of how good Infinities can get than the search for bigger and better is officially on!
 
Just thought I'd share my most recent experience with my RSM's. Picked up a couple of new amps...a Denon POA-1500 and Onkyo M-504. A/B'd both amps with the RSM's and though each sounded great, the Onkyo and RSM's really had something magical going on. Just an extradonarily detailed and dynamic sound from this combo. The EMIT's live up to their reputation and the clear poly midrange is excellent.....and the bass that this smallish cabinet produces is unbeleivable. It's better than my EV Interface
C's! Wow!! Time for a recap to see what these can really do. For the record the other equipment consisted of Onkyo P-306 pre, Yammie CDP-845, Yammie 31-band pro-eq, and Grant Fidelity Tube DAC 09.
 
tomlinmgt said:
Just thought I'd share my most recent experience with my RSM's. Picked up a couple of new amps...a Denon POA-1500 and Onkyo M-504. A/B'd both amps with the RSM's and though each sounded great, the Onkyo and RSM's really had something magical going on. Just an extradonarily detailed and dynamic sound from this combo. The EMIT's live up to their reputation and the clear poly midrange is excellent.....and the bass that this smallish cabinet produces is unbeleivable. It's better than my EV Interface
C's! Wow!! Time for a recap to see what these can really do. For the record the other equipment consisted of Onkyo P-306 pre, Yammie CDP-845, Yammie 31-band pro-eq, and Grant Fidelity Tube DAC 09.
Click to expand...

I have some similar equipment: RSb, which I belive is the same as the RSM except the woofer is the 10" instead of your 12". Also have DAC-09. Power is Musical Paradise MP301-MK2 (class A SEP tube). The Inifinity's sound like a fresh breeze on a sunny, mild day in the fall. Crisp and clear, no muddy sound. Do you have a digital out on the CDP to feed the DAC? Do you prefer the tube or SS out? (I know, this is an Infinity forum...) MY Sony DVP-SR200P (DVD palyer used for CD) has digital out to the DAC.
 
Yep, I have a digital coax out from my Yammie CDP. It's my understanding, and you probably already know this, that if you don't take the signal out of the CDP/transport via a digital circuit you don't get the full benefit of the external DAC. Reason being if you take the signal out of the transport via an analog circuit, such as RCA outs, the digital signal has been processed by the CDP's internal DAC's and you're left with only as good a sound quality as the CDP's DAC's can muster.....not even giving the killer converters in the external DAC a chance to do their thing. I'm back and forth on the SS and tube circuits. I've only been able to listen to the DAC 09 for a few hours, admitedly not much of that very sober, and prefer tube or SS depending on the style of music and the way the recording is engineered. Have you recapped your RSb's?
 
Yup, I know about the A/D signal concept.

I bought the RSb's thru Bartertown and the seller had just refoamed the woofers and recapped the xover. He did a very nice job. The RSb's replaced Nova 8's that I had just applied the "VideoLady" crossover mod to. (another thread here). The RSb's are vastly better IMO.

Funny regarding state of mind. Often the same here in ME!
 
Maine huh....y'all talk real funny up there (Larry the cable guy voice). In college I had a couple of buddies from Maine....great guys. Yes, I have to get my RSM's recapped and can't wait as I find them already remarkable. Do you find the midrange in the RSb's to be really forward without sounding imbalanced? My RSM's are that way and the only other speaker I've really heard that can do that with clarity would be my TimeFrame 600's. Speakers that can do this really stand out in a positive way. Ayuh.
 
Would it be possible for to post your recap info when you do it? Cap specs and where you got them.
I put my RSMs back into service after 17 years of storage. I think they sound fine, but figure a recap could happen in the future so any info would be nice.
 
Midrange is indeed forward but not imbalanced. Right now I'm using a spare receiver as my main amp is being swapped out due to some issues with it. It's been a month since I've had it so I don't have the best quality amp at the moment (KR-2400 is filling in).
 
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