Celestion Ditton 66 1" super-tweeter troubleshooting

[r042wal]

I have two pairs of Celestion Ditton 66 Studio monitors. I love their sound and started rebuilding one pair, using the other pair as backups. On my original pair, I replaced the diaphragm for the 1" super tweeter and that went well. On my temporary replacement pair, the right-channel 1" tweeter sounds fuzzy on some songs but not others. I do not know if this is a problem with the tweeter or the source. I am playing DSD64 stored on an Aurender server going to a PS Audio DirectStream Senior DAC and on to a Mac MC500.

Is there a way to test the tweeter by measuring resistance or impedance to see if there is physical damage? I have a good quality BK Precision ESR/LCR meter if that would be any help. Thanks in advance.

 

[Doodski]

Frequency sweep the speakers. If there is something wrong with the speakers it will usually show when frequency sweeping them.

Online Tone Generator - generate pure tones of any frequency

szynalski.com

 

[Doodski]

Don't turn the treble/high frequencies way up high... medium loud but not ear bleeding loud.

 

[voodooless]

Next to the sweats, a measurement microphone like MiniDSP UMIK can help pinpoint issues.

Microphone can also help optimizing your room acoustics, or apply room EQ, but looking at your gear I bet your not into that.

 

[r042wal]

I would like to change my story. I have an SACD version of the same Pink Floyd music I was using as a test and not the 1" tweeter but the 2" midrange is faulty. I took a pillow and covered the 1" then tried the same coving the 2". Definitely a bad right-channel 2" midrange. I have a new diaphragm for this but these are just the temp (parts) speakers.

 

[r042wal]

Next to the sweats, a measurement microphone like MiniDSP UMIK can help pinpoint issues.

Microphone can also help optimizing your room acoustics, or apply room EQ, but looking at your gear I bet your not into that.

Actually, I have all the hardware (ECM8000, Prosonic) and REW on my laptop but I wanted to get the crossovers done on my primary speakers first and get them connected back into the chain.

 

[voodooless]

Actually, I have all the hardware (ECM8000, Prosonic) and REW on my laptop but I wanted to get the crossovers done on my primary speakers first and get them connected back into the chain.

Well, that would probably have been easier than covering the tweeter with a pillow

 

[r042wal]

Well, that would probably have been easier than covering the tweeter with a pillow

Only for you experts that know what you are doing

 

[r042wal]

Thanks for everyone's input

 

[DanielT]

Is there a way to test the tweeter by measuring resistance or impedance to see if there is physical damage? I have a good quality BK Precision ESR/LCR meter if that would be any help. Thanks in advance.

See what the manufacturer states for DC resistance, then measure with a multimeter. Multimeter to begin with, but it can apparently be done in REW as well, see:

Deviation in DC Resistance/ Ohm, tweeter. How much is acceptable?

What do you think, or do you have to say about this? I have measured, and measured again with my (cheap) multimeter. One driver shows 5.6 Ohm and the other driver 6 Ohm. Measurements taken directly on the contacts of the compression drivers. Okay, there's some solder left, but here's what it...

audiosciencereview.com

 

[Rja4000]

Tweeters on early Celestion Ditton generation are their Achille heel.
I think I never seen one on the second hand market where tweeters are not blown. (If not, they go for a high price).
I have a pair of 33 in the basement and, of course, tweeters are both broken :-(

I remember we were listening to Rock or Reggae or punk on Ditton 15, 33, 44, 66 in the late 70s.
I did like the 442 very much, some years later.

 

[r042wal]

Tweeters on early Celestion Ditton generation are their Achille heel.
I think I never seen one on the second hand market where tweeters are not blown. (If not, they go for a high price).
I have a pair of 33 in the basement and, of course, tweeters are both broken :-(

I remember we were listening to Rock or Reggae or punk on Ditton 15, 33, 44, 66 in the late 70s.
I did like the 442 very much, some years later.

I have already replaced one diaphragm on the 1" tweeter of my original pair. It is quite easy. The tweeter is the HF2000. My problem now is the 2" midrange driver (MD500). I have a replacement diaphragm for this as well but these are my temporary pair. The easiest thing to do is swap the MD500 out of my original pair until I get the crossovers rebuilt then swap it back.

I had Ditton 25s before. Love the sound of these vintage boxes