My first ranked portable set up :
Alo Rx 3 B + Alo class tactical design + iPhone 4 S + LCD 2 rev 2 right angle
My Second ranked portable set up :
The Intruder + fostex hp p 1 + iPhone 4 S + LCD 2 rev 2 right Angle
Cable : lod to USB van den Hul tone arm cable in red and white sleeving
Mini to Mini 4 strand 18 awg solid core silver cable ex Singapore
with oyaide rhodium Angle jack and oyaide gold straight jack
LCD 2 cable van den Hul tone arm cable
Rudi, What are you getting from the Intruder that the HP-P1 amp is not providing?