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Old 10th September 2006, 04:00 PM   #11
sreten is offline sreten  United Kingdom
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Hi,

You can experiment by closing off one port (sock), will detune the
other port by half an octave and possibly extend bass by half an
octave albeit at a lower level.

Then I suggest you read up on line level passive EQing, line level
BSC (baffle step compensation) circuits are a good place to start.

http://sound.westhost.com/bafflestep.htm

Though choose your frequencies for lower bass somwhat.

Really need driver parameters and the internal volume of the box,
find them on the web and post them here, I'll model the alignment.

/sreten.
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Old 10th September 2006, 09:55 PM   #12
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Hi sreten, just noticed you are in Brighton. I am just down the sunshine coast in Newhaven.

I will get the peramiters together and post them asap.

Many thanks for the help so far.
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Old 10th September 2006, 10:35 PM   #13
Collo is offline Collo  Australia
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JRKO

I make the tuning frequency to be around 24hz. Blocking one port drops it to 17hz, which probably isn't what you're looking for.

Maybe the room node idea needs investigating further

regards
Collo
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Old 11th September 2006, 07:16 PM   #14
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Specs from Tannoy

Re 5.7 ohms
Fs 22Hz
Qms 2.4
Qes 0.2
Qts 0.18
Bl 18.72 na
Cms 0.58mm/N
Mms 90g
Sd 770 sq. sm
Vas 483l
Rms 5.1 mech ohms
Sensitivty @ 2.83v/1m 94.3db

There are specs that were mesured by someone @ www.hilberink.nl/codehans/tannoy39.htm that are different from these. My drivers were recenlty refurbisheded by Lockwood and have double the power handling - now up to 150w


In the original Tannoy docs they say that a sealed box is also fine. Would this help and tighten up the bass?
I am guessing this is in the wrong place now. Although a 15 inch driver probably counts as a sub anyway!
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Old 11th September 2006, 09:06 PM   #15
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If the speakers have been refurbished and now sport double the thermal power handling, the parameters from Tannoy and that other bloke's are useless. I'm afraid you need to measure them yourself.
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Old 12th September 2006, 01:54 AM   #16
mike.e is offline mike.e  New Zealand
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If the Qts is ~0.2 I wouldnt expect any low bass - only efficient midrange. Add a sub.
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Old 12th September 2006, 02:35 AM   #17
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If you suspect room modes ar the issue play around with placement and see if that helps(assuming you can play around with placement).
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Old 12th September 2006, 07:40 AM   #18
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I have emailed the guys at lockwood to get some new TS specs. I am assuming that the cones come from Tannoy as they are perfect replacements including the 'girdacoustic ribs'
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Old 12th September 2006, 09:32 AM   #19
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Here are the specs. The cones are original Tannoy replacements and these are the specs they provided with them.
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Old 12th September 2006, 11:30 AM   #20
sreten is offline sreten  United Kingdom
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Hi,

Hmmm....... low bass doesn't model that well but its well damped.
I estimated box volume at 80L, means tuned quite low.

Still I think some line level bass boost would work wonders if
your normal listening levels get nowhere near clipping levels.

/sreten.
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