Recent rect. GRF and Tannoy Reds fun and games

speedy.steve

speedy.steve

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I've been building a different dimension rect. GRF for that narrower room space...

First I used Hornresp to model the back loaded horn section and get the volume / baffle (throat and mouth sizes right). Once suitably conforming with the original shape rect. Tannoy model it was time to cut wood. 21mm Scandi birch ply throughout of course.

These are exactly the same volume at the others but are 45cm wide, 125cm tall and deeper by a bit.

Here's some pics
Basic plan


Cut out - The front baffle really is the narrowest you can go...


Under construction


First cab up


Recessed removable backs - allow access to crossover / tuning of the folded horn damping if needed. 24 screws fixing and gasket so no risk of resonance.


Part finished - few more spray coats to go.


In the room under test with HPD's loaded


Brass panhead bolts or caphead?



Full length vintage cloth grilles





Geniune NOS Tannoy Reds badges




Under listening tests with the Reds loaded and using a little 5W SET EL84 amp the sound easily filled my large lounge diner with great full Tannoy sound.
The modelling worked - they sound just the same as the other Rect Tannoy cabs I have heard.

I'm very happy with the resulting look / sound. Enjoyable project.
 
Last edited by a moderator:
Looks fantaastic, Steve. I really like the narrower/deeper cabinet.
 
Lovely work.

Steve, have you thought about making the cabs available as a kit?

Having seen your work first hand I think you should consider it, time and practicalities allowing of course.
 
Hi Steve

Beautiful! How does it compare soundwise with your usual design.

Also the vintage cloth does it make more of difference than the usual covering?

All the best

Jon
 
It's a while since I heard the normal format cabs but they are from memory very similar and have the GRF backloaded bass and of course the Tannoy front loaded sound.
We did tests with the cloth and it was pretty transparent actually. Not as thick as some I have seen.
 

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