Looks interesting. I take it a Tannoy DC can be used in a TL? I read somewhere that not all drivers are suitable.
Current Lash Up:
TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.
Well I'll soon find out.
Here are the parameters
T&S parameters of the HPD295/2528/ DU296 as supplied by Tannoy UK LTD:
TANNOY HI-FI
THIELE-SMALL PARAMETERS HPD295
Tannoy Ltd.,
Rosehall Industrial Estate,
Coatbridge,
North Lanarkshire,
ML5 4TF
UK
DRIVER TYPE: HPD295/ 2528/ DU296
DATE TESTED: -
NOTES:
Tannoy Ltd. The contents, information and copyright of this document are the sole property of TANNOY LTD
and may not be used for commercial gain without the express knowledge and permission of the owners.
Although believed accurate, no responsibility can be taken regarding the consequences of any errors or
omissions.
All measumements were made with the drive unit suspended in free air, with the free air resonance calculated
by the added mass technique, using a 0.1 ohm current sensing resistor. All figures are ± 10%, to allow for
manufacturing tolerences.
PARAMETER VALUE UNITS
Voice coil resistance, Re: 5,8 ohm
Free air resonant frequency, fs: 26 Hz
Moving mass, Mms: 34,4 gm
Electrical Q, Qes: 0,26 -
Mechanical & Acoustical Q, Qms: 2,2 -
Total Q, Qts: 0,23 -
Force factor, Bl: 11,2 N/A
Total suspension compliance, Cms: 1,1 mm/N
Equivalent volume compliance, Vas: 200 Litre
Mechanical resistance, Rms: 2,55 Mechanical ohm
Effective radiating area, Sd: 360 sq. cm
Sensitivity (2.83V@1m, 20 deg. C): 91,2 dB
Interesting design Duncan. You'll get some deep bass out of those.
I glue pieces of dowel between transmission line dividing walls and brace them against cabinet walls. I'd avoid using foam in the actual line. It reduces the effective dimensions at lower frequencies. Teased out long fibre wool is good. Plenty on eBay under crafts. Fabric/felt underlay is good for lining walls, perhaps with some bituminised damping pads underneath.
If you come up with any crossover tweaks, I'd be interested in hearing about them.
It is impossible for anything digital to sound analogue, because it isn't analogue!
Very good Duncan.. will be nice I reckon.
Regards,
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Oh my god! There's nothing wrong with the bidet is there?
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Interesting build. What do they sound like is the important bit?
TL's are simply Bass Reflex boxes in Drag ;-) once the drivers reach 8' diameter.. according to Martin King.
Not saying they won't work well, just that TL is an odd naming.
For it to be a true transmission line the line in theory needs to be infinite (in practice, not). But I don't think anyone has done that in a commercial speaker.
I've had large ported speakers and I currently have TLs (with 8 inch bass) and the difference in bass performance between the two designs is not subtle. Both go low but the TL has so much more power in the low stuff.
Current Lash Up:
TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.
I should of said 1/4 wave transmission line, all 7ft 6in of it, giving around 35hz tuning I think.
I recently had some IPL s4tl's here and agree the bass is outstanding, this was one reason for this project.
What I like about the Tannoy's is the point source and presence in the mids, it just sounds right.
But I don't feel the passive ABR works, seems to blur the bass lines.
Got some bitumen sound deadening in with some foam on top.
I going to leave the fronts screwed only until I decide on line filling or more foam if needed, after auditioning.
"Oh God ! What have I Created?"