Jump to content
The Klipsch Audio Community
Sign in to follow this  
Satyr

Mid Drivers: K-55-V or K-55-M?

Recommended Posts

In rebuilding an old set of Heresys (H-700s), the current mids are done for so they'll need to be replaced. The tweeters are K-77-M, the old mids were K-55-V. This speaker has a Type E network.

My question is two part: Should I put in a K-55-V so it will all be as before, or will a K-55-M be the nicer option and if so do I need to make any changes to the network?

Minimal opinions, maximum facts please.

Share this post


Link to post
Share on other sites

You need to ell us what's wrong with the -Vs. Commonly the voice

coil opens and you replace the diaphragm for $55. Solder terminal

-Vs (with "two-piece" phase plugs are the best of the available

squawkers. The K-52 of the Heresy 1.5 could be a good

option. I have no hard data on it. BEC might.

Share this post


Link to post
Share on other sites

As others have mentioned, a new set of diaphragms should put your old K-55Vs back in to shape.  


I have the diaphragms if you are interested.

Bob Crites
bobcrites@mac.com

Share this post


Link to post
Share on other sites

The old K-55-V, the lugs have broken clean off and there's no where to attach wires. The old owner had them for a long long time and he didn't know when/how that happened. Suffice to say I got the speaker for $15. Sound does come out fine from both the tweet and woof, no tears or any damage to the woof cone I can see of. So that's why I was asking about K-55-V or K-55-M. The tweeter is a K-77-M. Again, would a K-55-M require making changes to the network?

Share this post


Link to post
Share on other sites

I bet Bob's got a V there somewhere. Or the Atlas model. I would not change to the M in a Heresy.

Share this post


Link to post
Share on other sites

The K-55V and K-55M are NOT interchangeable. The K-55M runs about 1.5db hotter, the Heresy top end already runs HOT and running an M will require modifications to the crossover. Your best bet is to replace it with a K-55V preferably the solder terminal version with the dual phase plug since it is probably the best sounding of the Klipsch mid drivers.

Share this post


Link to post
Share on other sites
"The K-55M runs about 1.5db hotter"

Charles, where do you get that from?  Testing just does not bear that out.

Bob

Share this post


Link to post
Share on other sites

I guess it depends on who does the testing.

post-3205-13819321335546_thumb.jpg

Share this post


Link to post
Share on other sites

Since I decided to build some networks for a few people, I felt the need to revisit this issue a couple of weeks ago. Since Klipsch took that driver down a bit extra with the T4A -- I feel comfortable trusting the plots I just posted.

Share this post


Link to post
Share on other sites

"I guess it depends on who does the testing."


And the horn and the individual variation of the drivers being tested and where you decide to look at the curve.

I have found that, at least the way I would analyze the curves I have done, the K-55V single piece phase plug to have higher output than either the K-55M or K-55V 2 piece phase plug.

Bob

Share this post


Link to post
Share on other sites

Dean's graph's just prove to me what my ears already know. It is not too tough to detect a 1.5db difference in sensitivity in the midrange band.

I also heard it originated from some prodding of Trey and Steve P at one of the Pilgrimage's that the -M ran hotter than the K-55V (both versions).

Share this post


Link to post
Share on other sites

Lets hope all are really better than Dean's second graph shows.


Bob

Share this post


Link to post
Share on other sites

Hee hee. I think that second plot must have been a 40 year old K-55-V and a new out of the box K-55-M. Actually, I may have to remove that plot. That one was posted by Shawn, and I think maybe it was to compare FR, not sensitivity -- IOW's, I think he may have bounced up the position of one so he could get a better look at the FR of both. I'll email and ask. Still, we can use the first plot, the word of a few inside of Klipsch, and deduction from the changes in the network when they switched drivers.

Dean's graph's just prove to me what my ears already know. It is not too tough to detect a 1.5db difference in sensitivity in the midrange band.

I also heard it originated from some prodding of Trey and Steve P at one of the Pilgrimage's that the -M ran hotter than the K-55V (both versions).

It originated when I brought some networks I had built for Craig to Indy a few years ago. When we loaded them up in Trey's late model LaScalas, he *****-slapped me in public for having the autoformer tapped out at 4 and 0. Looking back on it now, I should have to told him to relax -- that I had a big *** swamping resistor in there. Anyways, Trey and Steve told me the K-55-V was 2.5dB hotter. By the end of the night, I had them down to 1.5dB.:) It really just depends on what part of the driver's response you look at.

Share this post


Link to post
Share on other sites

"I think that second plot must have been a 40 year old K-55-V and a new out of the box K-55-M."

I think it was a K55v out of a '76 LaScala and a K55M out of around an '84 LaScala if I am recalling the vintage of my LaScalas correctly. They were also on a 511B horn. But vintage is an important consideration since Alnico can loose magnetism easier then the later 'mud' units.

"Actually, I may have to remove that plot. That one was posted by Shawn, and I think maybe it was to compare FR, not sensitivity -- IOW's, I think he may have bounced up the position of one so he could get a better look at the FR of both."

Yes, FR not sensitivity. The original thread that was posted in is here:

http://forums.klipsch.com/forums/thread/276842.aspx

Shawn

Share this post


Link to post
Share on other sites

Dean,


Isn't it also interesting that the AK-2 and AK-3 attenuated the squawkers different amounts using the exact same K-55M driver.

Bob

Share this post


Link to post
Share on other sites

Yeah, I do. I guess they decided 4dB down was still too hot, so they went 5dB.:)

If we tap out on 3, we're only 1dB off. Just a thought.

Which drivers in the Klipschorns that you got from Dee?

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...