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Old 10th April 2017, 12:02 PM
gbcambridge gbcambridge is offline
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Join Date: Sep 2009
Location: Cambridge
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Default Heybrook HB1 Renovation

I recently acquired a pair of these fine old speakers, Heybrook HB1. (Mine are serial number 011053). The cone surrounds were shot (not unusual) but all else appeared to be OK. However, I wanted to review the crossover and there came the problem.
It appeared difficult to obtain a diagram of the crossover. I finally found one and everything agreed with my actual crossover except that my actual resistor is rated at 15 Ohms, while the published circuit states 18 Ohms. I say "published" is actually a freehand sketch by someone.

So, can anyone advise on this? I am hesitant to change what was implemented but I am curious as to the actual reason the resistor disagrees with the diagram. I have since found a diagram for a Series 2 crossover and there they are also showing an 18 Ohm resistor!
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File Type: jpg Crossover-1.jpg (120.8 KB, 18 views)

Last edited by gbcambridge; 10th April 2017 at 12:05 PM. Reason: Product name error
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Old 10th April 2017, 01:58 PM
Greg.'s Avatar
Greg. Greg. is offline
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Join Date: Dec 2005
Location: Bristol, UK
Posts: 3,131
Default Re: Heybrook HB1 Renovation

Considering the small cost involved and your ears being the final arbiter, I would try both values and settle on the resistor that sounds best. Simples!
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Old 10th April 2017, 05:34 PM
colin.hepburn colin.hepburn is offline
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Join Date: Jan 2006
Location: Newtonhill Aberdeenshire
Posts: 2,406
Default Re: Heybrook HB1 Renovation

Hi George
AH the HB1s remember them well
both maybe right i would try both the 15R and 18R
Will this help
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File Type: jpg HB1%20Mk3.jpg (29.5 KB, 15 views)
The Blues man

Last edited by colin.hepburn; 10th April 2017 at 05:44 PM. Reason: Added text
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