[ErinH]

Info:
Time to let go of my extra stash of Kefs...

I have 5 total. 4 used. 1 unused. Someone could make a killer home audio setup with these mated to a nice midwoofer.


These are truly some of, if not the best Concentric mids made. Kef's engineering on these is superb. They are intended to be used as a midrange/tweeter and most of the models using these drivers employ a 500hz crossover to keep cone motion minimal.

I have tested these drivers myself and you can find my test data here:
Kef: http://medleysmusings.com/kef-r300-midrange-drive-unit-testing/


Basic measurements are as follows:
~130mm OD
~110mm mounting diameter
~90mm mounting depth



Condition:

These were high passed at 500hz on the midrange and about 2.8khz on the tweeters. They also come with the round trim ring.



Asking Price:

(4) Used - $250/each shipped, CONUS.
(1) BNIB - $285shipped, CONUS.
(3) trim rings - $20/each shipped, CONUS.
Edit 02/21/15: $325 shipped for a pair!

That's less than half of what Seas wants for their lower-performing coaxial driver.


Contact:

Email: hardisj(at)gmail(dot)com and PM are fine.



Photos:

A couple shots of a used pair I have.

 

[imjustjason]

Man, I really wish I had a car I could fit these in. They do wonderful things in your car.

Given how hard these are to get your hands on it's a little surprising to me that you're selling any of them!

 

[ErinH]

Man, I really wish I had a car I could fit these in. They do wonderful things in your car.

Given how hard these are to get your hands on it's a little surprising to me that you're selling any of them!

thanks, dude!

yea, these aren't speakers that any Joe can just walk out and buy. It took me some maneuvering to get the sets I got. I'd keep them if I could afford to. But I gotta pay for my HT chairs somehow.

 

[ErinH]

Price drop to $560 shipped.

 

[JHUSTON]

If someone were to make bookshelves out of these, do you have an idea of enclosure size and porting?

 

[thehatedguy]

You wouldn't with those drivers. The woofer has a Fs around 170. You are going to need something on the bottom end.

 

[ErinH]

Indeed. These are meant to be midrange and tweeter. The cone and surround are designed as a waveguide for the tweeter. You don't want to put a waveguide in to (much) motion because it interferes with the tweeter response.

I cross mine at 350hz. That's the lowest I'd cross them.

 

[quality_sound]

I REALLY wish I had the room for these. I love KEF drivers.


Sent from my iPhone using Tapatalk

 

[cajunner]

these would be cool in a Design Acoustics approach, bookshelves with a downfire 8" woofer...

 

[JHUSTON]

Hmm, OK I didn't realiE the Fs was so high. I newly squires some KEF bookshelves so all is well regardless.

 

[imjustjason]

these would be cool in a Design Acoustics approach, bookshelves with a downfire 8" woofer...

LOVE the Design Acoustics point source series speakers.

 

[deeppinkdiver]

Im having very bad thoughts about my A-pillars and unmolested dash right now.. These look very interesting! Please tell us how you are using your set in your car?

 

[ErinH]

Mine are in my pillars. They are phenomenal speakers.

 

[ErinH]

uppage.

 

[Carlton8000]

What is the overall dimensions of the Kef?

 

[ErinH]

What is the overall dimensions of the Kef?

I put some on my site... rough approximations.
http://medleysmusings.com/kef-r300-midrange-drive-unit-testing/

I measured the OD at ~130mm. You probably want the mounting diameter and depth? I can get that for you later.

 

[Carlton8000]

Yes, depth and diameter when you can.

 

[ErinH]

I can ballpark mounting diameter at about 110mm. Depth... probably close to the Q100 driver which is 83mm.

But, I'll measure them tonight and post back the numbers when I get a chance.

 

[ErinH]

I can ballpark mounting diameter at about 110mm.

But, I'll measure them tonight and post back the numbers when I get a chance.

ha! I was spot on with the mounting diameter, lol...

I measured the drivers and got the following:
~130mm OD
~110mm mounting diameter
~90mm mounting depth

 

[Carlton8000]

Thanks for the measurements.