We can order 4ohm coils if you wish. Apollo upgrade is available as on all of our drivers except the dipole.
In comparison to most pro drivers, they are expensive. They are not however similar to most pro drivers. They are not designed to be just as loud as possible. They don’t take advantage of a harsh dustcap resonance to boost claimed efficiency. They are designed with efficiency in mind but the main emphasis of all of our drivers will always be put on low distortion and accurate reproduction. They compare more favorably to Scan Speak Revelator, Accuton, Seas Excel, Audiotechnology, etc than they do to most pro drivers. The TD8’s will have the added advantage or more efficiency vs those other hifi drivers.