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Bob Brines 5th July 2011 03:26 PM

And now for the FF165WK
2 Attachment(s)
Here are the measurements on a new pair of FF165WK's. The T/S specs are out-of-the-box. The RTA is with maybe 10hr.

I loaded the 165's in a pair of BR's that I had designed for the FE167E. The boxes are a bit big and tuned a bit low. I think that the ideal BR will be ~21L @45Hz. Anyway....

The new 165's have a sound very close to the old 167E's A bit firmer in the bass --note there is not BSC on the 165's. The bump @ 200Hz is probably baffle hump. The 165's are a bit sibilant as the FR would suggest. The only filter I see at this point is a low Q notch @4-7kHz.

I am pleased with the 165's They are drop-ins for the 167E's in my MLTL's where they sound better than the 166En's I forced into a modified MLTL. The highs are good enough for older ears, though the bat-eared will want a tweeter.

The FR traces are:
Gray=Combined driver/port


Godzilla 5th July 2011 09:34 PM

Looks good to me. Thanks for posting your results.

ra7 5th July 2011 10:07 PM

Thanks for the measurements again Bob.

Why would say these are improvements over the FE167E? The treble looks fairly shouty.

leo vendramini 27th October 2013 04:08 AM

Hi Bob,as I am thinking of getting a pair of FF165 drivers,could please give me the notch filter values that work the best.Thanks,Leo.

Godzilla 27th October 2013 08:48 PM

The best notch filter may be 30 degrees off axis.

Bob Brines 28th October 2013 02:24 AM

Right. You may want, no, you will want a BSC filter, but no notch. 30* may be a bit extreme, but somewhere around 15*.


sideways 29th October 2013 11:36 AM


I loaded the 165's in a pair of BR's that I had designed for the FE167E. The boxes are a bit big and tuned a bit low.
Hey you think this may be why you are getting some sibilance out of them??

Bob Brines 29th October 2013 11:47 AM

Phase plugs will help. You do have a BSC filter on them, don't you? The FF165Wk's are much better in this regard, an most others too.


GM 29th October 2013 01:28 PM


Originally Posted by sideways (

This is around an octave wide BW centered at ~6.7 kHz, so excessive peaking in the ~4.7 - 9.5 kHz BW is in theory to be avoided, yet many folks [though hardly all] find this adds a nice 'sharpness'/'inner detail' to many recordings depending on the type of signal chain combined with perceived tonal balance [flatness of response] at the listening position[s].


sideways 29th October 2013 01:48 PM

I don't own the 165's although I am considering them...

I own the 85's and find nothing wrong with them at all :)

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