Help with mid-range driver problem

[fredeb]

Get 2 drivers if you buy new . That way you know it's a close match .

[fredeb]

I am a little surprised at the trimmed edge driver in the round hole. 

@Hi-Phibian is right , looks like the wrong driver . Did you buy them 2nd hand ?

Here's a thread with pics of drivers : https://www.hifivision.com/threads/my-setup-linn-majik-109-aktiv.65557/

I'd guess it's meant to be a Seas driver https://www.madisoundspeakerstore.com/seas-woofers-6-7/seas-prestige-ca18rly-h1217-7-coated-paper-cone-woofer/

[Shonver]

I'd guess it's meant to be a Seas driver https://www.madisoundspeakerstore.com/seas-woofers-6-7/seas-prestige-ca18rly-h1217-7-coated-paper-cone-woofer/

Hmmm... different class of driver.

[fredeb]

If you compare the SEAS CA18RLY(H1217) response with measured response of the Majik 140 , the Seas appears to be exactly the right driver .

Source : https://www.stereophile.com/content/linn-majik-140-loudspeaker-measurements



Fig.4 Linn Majik 140, acoustic crossover on supertweeter axis at 50", corrected for microphone response, with nearfield midrange (magenta), woofer (black), and port (green) responses plotted below 300Hz.

Source : https://www.madisoundspeakerstore.com/seas-woofers-6-7/seas-prestige-ca18rly-h1217-7-coated-paper-cone-woofer/




Available here at decent price : https://www.hificollective.co.uk/components/seas-ca18rly-h1217-08.html

[HeadlessMan]

Gentleman

I thank you all for your input on this matter.

You had me convinced that the current drivers were replacement knock-offs, but then I got a late response from Linn saying that the Peerless drivers are in fact the correct units. Guess that’s a black against the fabled high quality of their components!

Would there be any point in upgrading them to the superior SEAS units, as has been mooted in the discussion? And can I be certain they would fit into the housing?


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[Shonver]

Putting in a better driver won't necessarily bring improvements. Where superior drivers excel is usually in the areas of more versatility. For instance, it could have extended and smooth top end response and/or extended low frequency response and/or higher power-handling. A midrange driver does not need all of that, as it is only used in a limited frequency band. So the extra features of your better driver may not be called into play.

[blizzard]

Yup, sign of the times.
Too many google cook's (engineers) in the kitchen 
Keep in mind that those drivers were chosen for a reason. Peerless btw are highly rated drivers! As for the "better SEAS drivers" I don't care what the tech papers say. The proof is the hearing of the pudding  Had my own experiences with so called superior drivers.

What most folks don't realize, is the amount of testing and development that goes in to a speaker design. 99.9% of the time COUCH Engineer Joe is going to go backwards if you don't have all the relevant testing equipment       

The most important question is, did the speakers sound good to you? If yes, replace with same and be happy
My 

[fredeb]

I concede . The Seas unit was used in the Majik 109 , not 140 , so the Peerless driver is then the right driver , as confirmed by Linn . The Seas units , although offering slightly higher power handling , may not work with the same crossover components .