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RE: Why.. did you ask ?

Posted by sailor (A) on September 22, 2015 at 06:32:36

In Reply to: RE: Why.. did you ask ? posted by Garg0yle on September 17, 2015 at 18:48:53:

Hi Paul,

I have a pair of Tannoy MG15's I have reserved to try out in OB. I read this thread hoping to find out what others might be doing but only found resistance to the idea. I have built about 8 pairs of OB using a variety of speakers including the Hawthorne Audio Silver Iris 15's.

I think you are perhaps making one mistake, and that is debating this with people who have a negative attitude and who clearly do not understand the OB potential.

The Silver Iris is based on a cheap 15" Eminence with a high Qts of about 1.2 and provides surprisingly good bass although it could be better detailed and defined. The overall sound is fun but a little unrefined with cheap XO and bottom of the range Eminence compression driver.

The Tannoy has a Qts of about 0.2 and will need help in the bass area regardless of baffle size (within reason ) The problem with increasing baffle width is it presents a huge reflective surface in the room and destroys OB's main attribute, spaciousness. I am considering using some 12" servo subs to augment the lowest 2 octaves. I will high-pass the Tannoys at about 80Hz with a 12dB LLPXO to keep the VLF from unnecessarily modulating the Tannoy cone. The resulting XO slope will nicely match the sealed box subs.

Previous experiments show a huge improvement in midrange clarity and expression when cone is freed from trying to also produce low bass. With low power handling, 65W if i remember, removing bass from the voice coil will allow the system to play louder with less thermal compression. This applies with varying degrees to all speakers

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