From bruce@ashbysolutions.com Fri Dec 05 04:07:50 2008
Subject:=?ISO-8859-1?Q?Re=3A_Leslie_bi-amping_=28was=3A_?= =?ISO-8859-1?Q?Speakeasy_needs_advice=29?=

Hi All,

>Usually built passive crossovers sends 60% to the woofer , 30& to mids and 10% to highs.
>
>That means 2X for the woofer if compared with horn driver (mids).
>
>So for getting 5-10X power to the lower end then a biamp schema should be needed.
>
>In such case would seem than the distinctive rotary sound can sound attenuated if compared with woofer power.
>
>I.e. an Eminence Delta (400W/500W rms models) would be nominally 4 times the power of usual 100/150W horn drivers but those specs IMO shouldn't mean to put woofer 'to the maximum'.

The balance between lows and highs is very critical in a Leslie/MS/RoadBox/etc. The hi-fi 'rule of thumb' of 5-10x doesn't work well: the result "sounds like a Leslie," but a kind of overly-bassy one. Much of the reason, as Rafael points out is that a Leslie isn't really a woofer/tweeter -- it's a woofer/MIDRANGE speaker system. (The high end falls off rapidly above 5kHz.) My experience is also that the mix should be 2-3x.

This same problem occurs when changing the woofer or horn driver on a passive speaker system. The top-to-bottom balance on a real Leslie may have been a little accidental, but the result is magic!

Regards,

-BW
--
Bruce Wahler
AshbySolutions.com™
978.386.7389 voice/fax
bruce@ashbysolutions.com

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