Those are good guys over there at Sinister. Most of their speaker offerings are PA type of speakers and they are using the Arc and Diamond Audio amps like most of us in the Sled Audio business.
One of the setup's No Cage Audio offers for you bike is our "Loud and Proud" system. It includes the Diamond Audio Micro2v2 amp (150 watts x 2 RMS) 1 pair of the HAT Imagine series 6.5" coaxial speakers, 5.25" to 6.5" speaker adapters, amp wiring kit, speaker wire and everything you need for the install. This system rocks and sells for $650.00 shipped. You can upgrade to the Arc Moto 602 V2 speakers for an additional $50.00.
We also could do the Rockford Fosgate Power Series TM400X2AD Class AD 2‑Channel amp (200 watts x 2 RMS) with the Arc Moto 602 V2 speakers with the rest of the hookup package for $825.00 shipped. This setup absolutely screams. With the Input and Output clip lights, fine tuning of the amp is a breeze
RF gets a lot of bad press and deservedly so for some of their cheap entry level equipment. But their top of the line Pro Level "Power Series" equipment is as good as any thing out there at any price
If you want to talk about some of this stuff, PM me or give me a call
Karl
214-587-4963