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RE: Some follow up on the Olson modified monsters

Posted by Paul Eizik (A) on June 23, 2007 at 11:01:19

In Reply to: Some follow up on the Olson modified monsters posted by gopies on June 23, 2007 at 06:43:20:

Hi John

I would'nt take the mix up with the drivers too seriously, it's just a road bump in the developemental process (both models are painted gold). Problems with used drivers are common, even from reputable sources, as you don't know who had the drivers before that. Tannoy only guaranteed that the specs would be within 10%. The specs on the Tannoy Gold site for the HPD 385 were apparently obtained from drivers which had the surrounds replaced. Anyway, they are not drasticly different from the Golds. Fs is 22 Hz to the Golds 26 Hz. EBP is 110 to the Gold's 118, so they should still be able to drive a BLH. Mass roll off is 220 Hz for the 385, and 236 Hz for the Golds, which is a non-issue in a BLH with direct radiator front output. If you like the midrange, you likely have a winner. If you hate the midrange, you would have a difficult path ahead at the very least, even with good suporting performances by the highs and lows.

With the Stereophile Test Disc, you should be able to tell where the bass response of the horn drops off. Set the CD for the midrange test track, and adjust the volume to a comfortable level, the ear is most sensitive to the 3 to 4 K Hz range. Next set it to the bass test. As the signal drops lower you should be able to hear where the horn drops off sharply, somewhere below 50 Hz. A -3dB downpoint is usually the area of interest here, but can be difficult to hear by ear, but the steep mechanical roll-off of the horn should be obvious, especially with the 20 Hz tone. This is best done when home alone, which may be the most difficult part ; )

Don't get discouraged!

Paul

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