Date: December 14, 1999 at 02:23:08
From: Dan Wiggins, [ts004d05.sea-wa.concentric.net]
URL: Avatar Audio
Subject: Re: Shiva Wiring Question

<< Greg, The Shiva by default is two 8ohm coils. So you would only run one coil and the other coil is left open(QTS=.39) or shorted together (QTS=.7). The driver with the higher QTS will require a much larger box but will have a lower F3. Hope this helps. -MAG >> Right idea, wrong associations...:) When you run a single voice coil, it has the nominal single-coil Qes of 0.8. So, with the second coil open, you'd have a Qes of 0.8, and a Qms (unchanged) of 6.5, for a Qts of ~0.7. Now, when you short the second (unused) coil, it essentially acts as an electric brake. This will manifest itself by lowering the Qms to the Qes of a single coil: 0.8. So, you'll have a driver Qes (of the coil you're driving) of 0.8, and a Qms (of the shorted coil) of 0.8, for a combined Qts of ~0.4. One coil driven, other open, Qts = ~0.7. One coil driven, other shorted, Qts = ~0.4. Dan Wiggins President Avatar Audio