Zd542 has a point. Here is a shot of your aim it 5i
http://www.naimaudio.com/hifi-products/pdt-type/nait-5i
If this s the naim you are using...it's not designed to use a separate preamp...
http://www.naimaudio.com/hifi-products/pdt-type/nait-5i
If this s the naim you are using...it's not designed to use a separate preamp...