FE167E Bass Reflex w/Ported Stand - diyAudio
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Old 23rd October 2012, 03:42 PM   #1
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Default FE167E Bass Reflex w/Ported Stand

Ever since seeing the plans for this speaker years ago, I have wanted to build them on aesthetics alone. I recently acquired some 3/4" 11-ply Baltic Birch and decided to let the chips fly.

I was shocked at the outcome! They extended much lower in the bass region than I expected. They have the signature Fostex harshness, but overall, a very enjoyable listening experience. These were built for the Master Bedroom but have a temporary home as my primary speaker whilst I build my Markaudio Alpair 12P Pensils.

Only thing left to do is stuff, sand and seal!
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Old 23rd October 2012, 04:02 PM   #2
IG81 is offline IG81  Canada
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They look great! Are you using any baffle-step correction?

IG
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Old 23rd October 2012, 04:16 PM   #3
toobhed is offline toobhed  United States
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Very nice Craigtone! I have a pair of the same drivers in small BR cabs and they love my bottlehead 2A3 amp.
Mario
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Old 23rd October 2012, 05:26 PM   #4
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Quote:
Originally Posted by IG81 View Post
They look great! Are you using any baffle-step correction?

IG
No BSC, straight from the Dynaco transformer to the speaker! I am only really noticing a harshness in upper midrange. I am considering the phase plug mod.

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Originally Posted by toobhed View Post
Very nice Craigtone! I have a pair of the same drivers in small BR cabs and they love my bottlehead 2A3 amp.
Mario
Thanks! It was a surprisingly complex build ... a LOT of pieces to glue together! I plan on building a set DRD 300B monos this winter. After this build, I am now a firm believer in fullrange drivers!
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Old 23rd October 2012, 05:38 PM   #5
chrisb is online now chrisb  Canada
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how many hours on the drivers?

In addition to the "signature" Fostex harshness is the well known roller coaster ride during the break-in period - at least a couple of hundred hours

and yes, the phase plugs are one step towards taming these
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Old 27th October 2012, 02:02 PM   #6
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how many hours on the drivers?

In addition to the "signature" Fostex harshness is the well known roller coaster ride during the break-in period - at least a couple of hundred hours

and yes, the phase plugs are one step towards taming these
Not sure ... I picked them up from Bob Brines used ... IIRC, several hundred hours, so should be well broken-in by now.

I am pretty sure I'll do the phase plug mod even if it reduces a little top end. I can always compensate with a set of T90A's if need be!
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Old 27th October 2012, 03:27 PM   #7
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Quote:
Originally Posted by craigtone View Post
Not sure ... I picked them up from Bob Brines used ... IIRC, several hundred hours, so should be well broken-in by now.

I am pretty sure I'll do the phase plug mod even if it reduces a little top end. I can always compensate with a set of T90A's if need be!
Yes, those drivers are well used. Phase plugs will put a hole in the response 5-7kHz that reduces sibilance and smooths out female voice. See my review of this.. Phase plugs to nothing with the main cone breakup 3-5kHz nor do they affect the top end.

One thing to note: Your cabinet have no real bass. When modeled, they have an F3 of somewhere around 105Hz. While the cabinet is "tuned" to ~40Hz, it is acting like an aperiodic box. The lack of bass is one reason they sound bright. Cross them over at 150Hz or so to a sub(s).

Bob
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Old 27th October 2012, 09:23 PM   #8
chrisb is online now chrisb  Canada
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craig: while I imagine you'll be spending much more time over the next couple of weeks with the new 12Ps, as Bob says, the FE167 will never shine in the Fostex design - they are capable of digging much deeper than 100 or so, but would need something like an MLTL, such as:

M12-F165

(seen here sporting the FF165WK with some dimensional changes, but IINM very similar to Bob's longstanding design for the FE167E)

Click the image to open in full size.


or larger volume ported enclosure - this one works fairly well

Click the image to open in full size.
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