Hi Pardales,
The only problem I see is the 4 ohms 20 Hz-150 Hz rating for your speakers.You may need to move up to the 4875 chips run in parallel to be safe.I use 15 ft speaker cables without problems. You could contact Peter and let him know what your using. He builds everything custom anyway.If it is possible to use the chip amps, he will know how to design the amplifier to meet your speaker's needs. My speakers are also 89db efficient but stay above 9 ohms through most of the frequency range. The great part is you have nothing to lose but shipping. Peter will refund your money if you aren't 100 percent satisfied with the custom build.
Cheers
The only problem I see is the 4 ohms 20 Hz-150 Hz rating for your speakers.You may need to move up to the 4875 chips run in parallel to be safe.I use 15 ft speaker cables without problems. You could contact Peter and let him know what your using. He builds everything custom anyway.If it is possible to use the chip amps, he will know how to design the amplifier to meet your speaker's needs. My speakers are also 89db efficient but stay above 9 ohms through most of the frequency range. The great part is you have nothing to lose but shipping. Peter will refund your money if you aren't 100 percent satisfied with the custom build.
Cheers