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Old 5th October 2015, 11:12 AM   #1
kirbyt is offline kirbyt  Canada
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Default A question for Mr Pass

Hi Mr Pass, sorry this is a little off forum topic, being a pass labs / tannoy owner I was wondering if you've made any crossover modifications to your 385hdp Jensen imperial set up or if you've kept stock values. I seem to recall somewhere there was mention of some changes done. Would you mind sharing as such? It would be greatly appreciated. Thanks
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Old 6th October 2015, 11:57 PM   #2
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Joe Sammut put the Tannoy 15" HPD385 coaxials into Jensen Imperials
(upside down) built by my interns in 1999. The crossover is based on the
original from Tannoy, incorporating some of the changes offered by Filton
Acoustics. I think the only original component is the transformer. Some of
the replacement caps are Hovland. Other caps, resistors, and coils are
from North Creek Music.

I have the original schematic, but over 16 years I think it's a little out of
date. It retains the original 2 pole approach at 1 KHz, but the values have
been tweaked.

The performance is +/-5 dB from 30 to about 18 KHz, except for a 55 Hz
bump from the BL horn which I tamed initially with an active filter and later
with fiberglass in the throat of the bass horn.

We have several pair of these, and they remain our primary reference for
evaluating amplifiers. To quote Joe, "They might not be the absolute best,
but they allow you to hear the differences between amplifiers"

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File Type: jpg JOES-TANNOY.JPG (404.2 KB, 793 views)
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Old 7th October 2015, 12:08 AM   #3
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Some more stuff that may help you piece this together.

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File Type: gif tannoy xvr 1 copy.gif (87.0 KB, 772 views)
File Type: gif tannoy xvr 21 copy.gif (121.6 KB, 765 views)
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Old 7th October 2015, 01:01 AM   #4
Zen Mod is offline Zen Mod  Serbia
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tnx Pa

I'm as a Mosquito ........ but you really need to try that TL for Tanns



edit: if nothing else , I see that you're using Zen caps

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Old 7th October 2015, 01:02 AM   #5
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Another priceless piece of information.
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"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
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Old 7th October 2015, 06:12 AM   #6
kirbyt is offline kirbyt  Canada
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Very cool thanks a bunch for sharing this. It's going to be my next project! My first real stereo was a threshold 400a and a pair 12inch monitor golds some 22 years ago. Fast forward and I've got a pair 385 hdp an xa30.8 and some advice from a guy who's amps started it all for me. I find it extremely unique how in touch and giving to the audio community Mr Pass is, thanks again.
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Old 7th October 2015, 06:36 AM   #7
wayne is offline wayne  United States
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If you look at the BOM you will see a tapped coil that is in the lower right corner of the photo.
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Old 7th October 2015, 06:57 AM   #8
Zen Mod is offline Zen Mod  Serbia
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I just recently made the same , instead of weeny original autoformer
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Old 14th December 2015, 07:55 AM   #9
kirbyt is offline kirbyt  Canada
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Well I built the cabinets, biggest I've ever had it was a two person event getting them from the shop to the house. Luckily I have a man cave downstairs so I'm in the clear with the wife ( actually she likes them better then the open baffles they've replaced for now big trumps ugly, little does she know the open baffles are in for some alterations and may be making another appearance) next is the x- over mods. May I ask though, keeping in mind that you use these to evaluate with, is there a particular amp from your stable that you find yourself gravitating towards with these speakers? Thanks again for the info

Last edited by kirbyt; 14th December 2015 at 07:59 AM.
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Old 14th December 2015, 05:42 PM   #10
Bare is offline Bare  Canada
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Hmmmm Having Fooled with My Tannoys since I bought them in '71 Suggest also looking at (experimentally building .. even, Troels Crossover suggestion for Golds)
TannoyMG15-Up-Grade

Do notice that the Flitton "acoustics' xover schema has Bungled the LF coil using the "wrong" 1.2 mH value.
(some unknown Twit had in years past, scribbled in a 1.2 mH value on the Genuine Tannoy Circuit diagram ( I have copies of the Unmolested one as well) and Moderene times being what they are.. the Missinfo instantly dispersed)
Repeated wide sample measures suggest ~3.3mH on the OEM coils.. DO read Troels analysis.

I assembled Troels xover as a lark and it subsequently supplanted a bespoke 'for Golds' Active gizmo I had assembled was using
In truth only marginally better but Ohh so much simpler a setup.
Lotsa ways to a similar end
Note there are some experimenting with Open Baffles AND a front loaded horn.. Who knows it may even Work.
One man's adventure:
truefi: March 2015

Last edited by Bare; 14th December 2015 at 06:12 PM.
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