I just found these on EMU's website if anyone is interested:
http://www.emu.com/products/category.as ... tegory=632
ON SALE! You save 54%
E4 16 Out/8 In ADAT Expander Kit
This kit allows you to add a 16 output/8 input ADAT interface to your E4 Sampler (except e64)
In Stock (Available for Shipment)
$249.99
ON SALE! You save 60%
E4 24-bit RFX ADAT Expansion Kit
Expands your E4 Ultra with 8 ADAT inputs and 16 ADAT outputs (all 24-bit) - requires RFX-32
In Stock (Available for Shipment)
$99.00
ON SALE! You save 68%
E4 24-bit RFX 8 Input Kit
Expands your E4 Ultra with 4 24-bit analog inputs - requires RFX-32
In Stock (Available for Shipment)
$109.00
ON SALE! You save 60%
E4 24-bit RFX 8 Output Kit
Expands your E4 Ultra with 8 24-bit analog outputs - requires RFX-32
In Stock (Available for Shipment)
I just ordered the 4 input kit (just because I'm such an optimist regarding ever finding that power supply for my EMU:))