Is that the Gallo Reference 3 amp? If so, I would definitely go with that option, giving you integrated stereo bass down to 22 Hz.
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I agree with the Gallo Sub Amp recommendation. Unless you have a preamp and power amp combo that can replicate the goodies found in the Gallo Sub Amp.
I am currently driving the 2nd voice coil of my Gallo Ref. 3.1s using an Emotiva UMC-1 preamp and a Sherbourn power amp with 325 watts/ch. This setup works very well, the UMC-1 gives me an 11 band equalizer for the sub channel as well as variable crossover freq. and selectable slope (12 or 24 db/octave).
In your case, the Gallo Sub Amp would be the way to go since your preamp does not provide such amenities. And you will most definitely enjoy the sound, the Sub Amp makes these truly full-range speakers...
I finally pulled the trigger and did indeed order the reference sub amp. I have been listening for two days and wow what a difference. Everything the speakers did well before is even better now. The imaging is slightly better. The soundstage has gotten much deeper. And lastly, there is more sense of space between instruments. It's amazing what these little speakers do. Thanks to all for the recommendations. I am very happy with the results.