Speaker Asylum

historically it was the default!

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mhardy6647

A

In Reply to: RE: SEAS A26 Woofer posted by hahax@verizon.net on December 19, 2023 at 23:02:25

Vintage paper cone drivers generally are very well behaved -- only when crossover design became very straightforward did woofers with awful out-of-band behavior become "reasonable" for loudspeaker design.

A classic example of a purpose-built woofer with well-behaved HF rolloff was Winslow Burhoe's 8" "EPI" woofer (and its kin). Huy Powell still builds replacement drivers (and whole loudspeakers) using a modernized version of the Burhoe woofer(s). See website below.

all the best,
mrh

https://www.humanspeakers.com/# (Open in New Window)

Follow Ups:

RE: historically it was the default! - Bill the K 21:15:34 12/20/23 (1)
Didn't Burhoe make a floorstander with slanted top with drivers on the slope. Forgot the name. It got good reviews from inmates here. Don't see it anymore.

Bill
- several, to the best of my knowledge - mhardy6647 06:22:05 12/22/23 (0)
  EPI M201/Epicure 20 is the one I remember.
  I have a friend in the Silicon Valley who still, AFAIK, has a pair. They were quite nice to listen to.
  Epicure 20/20+ image from Humanspeakers (link below).
  
  EDIT: I believe Burhoe may have made similar loudspeakers later, under one (or more) of his later brand names, too!
  PS I think I mentioned this, but both Burhoe and Powell are on LinkedIn.
  
  all the best,
  mrh
  - https://www.humanspeakers.com/e/epicure-20.htm (Open in New Window)
  Edits: 12/22/23
RE: historically it was the default! - hahax@verizon.net 11:04:36 12/20/23 (2)
Thanks but unfortunately he doesn't show frequency response so I don't know how it performs at the top of his drivers' band width.
- I'll see what I can find - mhardy6647 06:27:46 12/22/23 (1)
  I can tell you empirically (only) tha the rolloff is smooth. XO on the "Burhoe modules" was first order on the tweeter (only) with a 10 uF capacitor (nomiunally 1800 Hz). I didn't calculate the XO frequency, it is from the link below, and may not be accurate. :-p
  
  all the best,
  mrh
  - https://www.humanspeakers.com/e/epi100.htm (Open in New Window)
  - welly, well, well -- here's what a quick googlage turned up :) - mhardy6647 06:36:04 12/22/23 (0)
    Someone's measurement of the same woofer in the slightly larger EPI 110 enclosure. Not exactly what you're looking for (and, obviously not a laboratory measurement, nor a modern "spinorama"), but at least a little data to support the subjective impression (and the prevailing wisdom) about these drivers. HTH!
    
    For reference, here's a photo of one of a pair of EPI 110 with woofers hich I re-surrounded with generic (three dollar) surrounds.
    
    Proper replacement surrounds for these woofers are available (from Rick Cobb, e.g.) and are well worth the additional cost (still quite reasonable, less than $30 the pair).
    
    Here's an EPI 100V that I re-surrounded with Rick Cobb's surrounds. The performance of this woofer should :) pretty well match the original performance.
    
    I kept the 100Vs. Everyone should have a pair of these for reference, I'd opine :) They're epochal, and they don't take up very much space!
    
    all the best,
    mrh
    - https://community.classicspeakerpages.net/topic/3078-epi-100 (Open in New Window)

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