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-   -   Ultimate Open baffle for tannoy red 15 inch (http://www.diyaudio.com/forums/full-range/223210-ultimate-open-baffle-tannoy-red-15-inch.html)

murphythecat8 9th November 2012 02:39 PM

Ultimate Open baffle for tannoy red 15 inch
 
hi everyone. I will build a open baffle for my dad.

please recommend me what open baffle I should do if I want the bass to go down to 80 hertz...

cheers

ratbagp 10th November 2012 01:12 AM

Out of curiosity, why 80 hz? I have played around with my father's 15" reds in an open baffle but I was not expecting to go anywhere near that low. What were you thinking of for the below 80hz?

I don't have room for a suitably sized box.

ray

murphythecat8 10th November 2012 02:49 PM

Quote:

Originally Posted by ratbagp (Post 3235538)
Out of curiosity, why 80 hz? I have played around with my father's 15" reds in an open baffle but I was not expecting to go anywhere near that low. What were you thinking of for the below 80hz?

I don't have room for a suitably sized box.

ray

hi
how low were you able to acheive?
I want as low as possible, and 80 hz its the point where I feel that its okay 80 hz without sub, but i it cant go to 80hz, I will need to get a sub also...

ratbagp 10th November 2012 03:09 PM

I got nowhere near 80hz, probably more like 200. But my baffle was only about 20" wide and 36" high. My wife has a say in this and huge baffles are out of the question.

I tried a slot loaded dual 10" woofer arrangement and it seemed to mate ok but nothing wonderful. I am no expert with this stuff.

You should try working with the Edge program to get a sense of how low you can go with various sized open baffles and look at some of the other posts about using 15" speakers on open baffles.
Home of the Edge

If you read the Martin King pages you will find that the low QTS of 0.26 for your Tannoys is not ideal for very low frequencies.
OB Theory

ray

Bare 10th November 2012 04:32 PM

Quote:

Originally Posted by murphythecat8 (Post 3234824)
hi everyone. I will build a open baffle for my dad.
please recommend me what open baffle I should do if I want the bass to go down to 80 hertz...

cheers

Why? in a Very poor Box enclosure (most anything). that driver will hit ~40Hz, even on lo quality electronics.. it's fs is in the 20's IIRC.
With a 1khz crossover point to the horn section, what's the point of an OB unless you favour large sheets of plywood.

AndrewT 10th November 2012 04:37 PM

I would look at the Qts of a 15" Tannoy and look at typical recommendations for Qts in successful OB builds and conclude that this 15" Tannoy does not suit OB loading.
The low Qts of the big Tannoys suits box loading, not the sealed variety, the vented style. Tannoy specifically mention this in their literature.

A big vented box suits the high efficiency big Tannoys down to a T.
Try a 200Litre box tuned to ~ 30Hz to 35Hz. It plays deep and loud. But excessive excursion below resonance must avoided. You will tear surrounds if you overdrive with VLF.

flutterplucker 11th November 2012 12:44 PM

How low could a tan red 15" go on say a 4'x8' piece of plywood?

chris661 11th November 2012 01:45 PM

EQ it. It'll go as low as you like, but maximum SPL will be severely compromised.

I suspect that, no matter how big the baffle (unless it becomes effectively infinite) is, you won't get satisfactory low end out of this driver.

It is meant for enclosures that will reinforce the low frequencies. You're attempting to put it on an OB, which loses LF.
It isn't going to work, unless you throw some power at it.


Alternatively, save yourself some money on plywood, and get an Eminence Beta 15 per side, in addition to the Tannoys. Put a big inductor in series with the Eminence, get it as near to the floor as you can.
I'd recommend against the Alpha 15 (commonly used on OBs) as I'm yet to hear it sound as good as a closed-box system - the Beta 15 is a better driver.

Chris

Godzilla 11th November 2012 02:01 PM

Chris661, how do you setup the inductor on the Beta 15? What values?

TIA!

murphythecat8 11th November 2012 02:28 PM

ok then. thanks everyone
I will build a enclosure
thanks


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