I've had several IB installers want to know about multiple driver discounts. Rather than dealing with these individually I've just updated the site with two multi-driver options, discounted relative to the single driver price.
The 2-Pack price for the Tempest-X $165 each Price per liter of displacement = $38.37
The 4-Pack price for the Tempest-X $155 each Price per liter of displacement = $36.05
The 8-Pack price for the Tempest-X $150 each Price per liter of displacement = $34.88
I don't have a 8-Pack simply because the UPS software that interfaces with my shopping cart doesn't have a way of recognizing that I'm shipping each as an individual box. The weight for 8 Tempest-X is over the 200lb limit. Just order two 4-Packs and I'll adjust the price to $150 per Tempest-X in 8 driver orders.
http://www.diycable.com/main/product_info.php?cPath=24_93&products_id=658http://www.diycable.com/main/product_info.php?cPath=24_93&products_id=659The 2-Pack Price of the Shiva-X $155 each
The 4-Pack Price of the Shiva-X $150 each
The 8-Pack Price of the Shiva-X $145 each
This type of pricing should firmly put the Shiva-X & Tempest-X ahead of competing offerings on a cost per displacement ratio. That also ignores the fact that these XBL^2 motors offer real improvements in terms of distortion.