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PostPosted: Fri Sep 22, 2017 10:39 am 
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Joined: Mon Aug 08, 2016 5:46 pm
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Location: Markham, ON, CA
Hi folks. I am looking to replace the current 1 inch Ti tweeters in both pairs of my S38s...

While I like the forward nature of the overall system, the tweeters shriek (! :oops: ) at higher volumes on some tracks....they are not very nice at all!

Currently the tweets are the 33663's with crossover at 3200 Hertz. Impedance is 3.6 ohm.....

I am thinking of a less-fatiguing soft dome tweeter? Any suggestions? And I get it; it might be better to sell these speakers on and buy something else....but with that attitude I would be on my fifth wife by now :lol: ....

Any suggestions to replace the "shriekers" would be appreciated.

Hope to meet a few of you at TAVES; anybody thinking of going on Friday?

Tom


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PostPosted: Fri Sep 22, 2017 10:56 am 
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Joined: Thu Nov 25, 2004 4:52 pm
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Location: Montreal, QC, CA
Retrofitting another tweeter into that waveguide will be a challenge. Why not try some less invasive and reversible such as adding some low value wirewound series resistors to attenuate the tweeter drive?


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PostPosted: Fri Sep 22, 2017 11:05 am 
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Location: Markham, ON, CA
Michael F wrote:
Retrofitting another tweeter into that waveguide will be a challenge. Why not try some less invasive and reversible such as adding some low value wirewound series resistors to attenuate the tweeter drive?



Good idea. I was not even worried about the waveguide...I was going to surface mount the replacement tweets....

Any suggestions for starting values for resistors? I really do like the idea of not doing damage and being able to adjust. I just want to tone down the HF.....at my advanced state of decay I really wonder how bad the HF stuff must be on my dogs!! Thanks.


Last edited by brownslane on Fri Sep 22, 2017 12:23 pm, edited 1 time in total.

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PostPosted: Fri Sep 22, 2017 11:10 am 
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Joined: Thu Jan 13, 2011 11:29 am
Posts: 498
Location: St.Catharines, ON, CA
Grapevine says rebranded Audax TM025 is what it is.
Good thing is Audax made a textile version.
They have a whole family of the series actually.

Gary


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PostPosted: Wed Sep 27, 2017 6:43 am 
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Joined: Mon Aug 08, 2016 5:46 pm
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Location: Markham, ON, CA
The tweeter mount on an S38 is a little different than many speakers as the waveguide is matched to a rear pin-mount bracket for the tweeter. My tech has given me a couple of resistors to try, but in the interim I tried a simple trick....I removed the tweeter from its rear-mount and inserted a single layer of kleenex. And, lo to behold, the shrieks are banned to the netherworld. The HF response is still there, just "softer" and much more pleasant.

This brings up another observation. I have a similar system setup in the basement on a broadloomed floor over 3/4 plywood mounted on 2 inches of foam. The walls and ceiling are filled with Safe N Sound. And the same S38's sound wonderful. Nice and forward, clean and never shrill. Bring the same speakers upstairs into a room with natural wood floors and "builder grade insulated" walls and they shriek. Dimensions and distances are similar. Proof that room treatments are critical.

Next step is better isolation of speaker cabs (JBL 4311) from those wood floors.

Best, Tom


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PostPosted: Wed Sep 27, 2017 7:14 am 
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Location: Montreal, QC, CA
Recording studios used the same "technique" to tame Yamaha NS-10M`s, it`s a quick and dirty but effective solution.
Your observation with the same speakers in a different room clearly demonstrates the importance of room acoustics. Most people do not realize just how much of the room they are actually hearing.


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