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Advice needed: replacing tweeter in PSB Image 4T

On a lark I purchased a pair of PSB Image 4Ts for my brother in law who is using bookshelves in a 25 foot ceiling room, thinking these would be more enjoyable to use until his budget allows him to get what he wants.  They are in pristine exterior condition, but just don’t sound right to either of us.  At first I attributed this to comparing them to the Imagine Ts I have, which I really enjoy.  The sound coming from the tweeters is markedly off, almost tinny and somewhat faint, leading me to conclude the tweeters are not working as they should rather than the inherent performance of this speaker, which seems to have pretty good reviews.  This was reinforced by online references to some PSB speakers being prone to having tweeter issues.

A couple of sources recommended replacement with Peerless by Tymphany BC25SC06-04 1” textile dome tweeter as a perfect match (different material notwithstanding), just “swap and done”.  However, others stated that the differences in specs for impedance (6 ohms vs 4 ohms) and sensitivity (89db/2.83V/m vs 96.2db/2.83V/m) between the PSB and replacement part respectively needed to be compensated for with modifications way above my knowledge level to understand or implement.  On the plus side the tech support guy where I purchased the replacements (only $35/pair) said put them in and if I don’t like the sound just return them, which is what my plan is right now, fingers crossed.

Any advice/thoughts is greatly appreciated!

mgm424
russ69's avatar
russ69
3,360 posts
 
Replace the tweeters with the stock replacements. Play some music with your ear next to the tweeters on the speaker before and after you replace them. They should sound a little weird but you'll hear the difference between good tweeters and broken tweeters. 
corelli
947 posts
 
Unless this was a really poorly designed tweeter, would be quite unusual for both to go bad at the same time.  Even with prior abuse, tweeters usually burn out instead of "going bad".

Yes the specs are way off. Surprised anyone would suggest these as drop in replacements. Even with close specs, swapping different tweeters will always be a complete crap shoot.  Are stock tweeters available?  

But, hey, if you can return the Peerless tweeters, what have you got to lose?  Sounds like a fun way to spend a few hours.
mgm424 OP
2 posts
 
Thanks so much for the responses, especially the crapshoot analogy!  Yes, multiple posts saying this particular PSB series prone to tweeter problems/failure so I’m guessing that may be the case with this pair.   Parts arrive tomorrow, I’ll try contacting PSB if I strike out.  I’ve decided to be happy that I can still hear the difference at my age (65) no matter the outcome.  Thanks again.




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