I have an old school MTX RT-A2100 (2x100@4ohms) amp that he may be interested in, if he likes old school stuff. The amp is about 20 years old, and I believe it was the first year if the Road Thunder series of stuff. I ran in bridged to my 4ohm sub and it worked great...the terminals could use a good wire brushing though. Fused at 50amps...this is pure power, no crossovers.