For 699, it's not a bad amp. It is however another Chinese stripped down clone of the Crest CA18.
If you look around, there are a slew of these around. Even Marathon has their copy... the 5050.
I think Bosso put the Marathon through it's...
Also, if it was ever reconed with a genuine kit, there would also be a white sticker on the frame and possibly hand written markings indicating whether it's a 4,8 or 16 Ohm coil... in your case, you would see 2226H..
I could be wrong but the cone does not look like a genuine JBL. Genuine cones have fibre pulp that is noticeable underneath... it should not be smooth like in the picture you posted. If you decide to get recone kits, I would advise...
I was going to suggest taking a look at your CPU utilisation, try dissabling your anti-virus. (MS Security Essentials is known to slow things down quite a bit).... and I would also try a transfer in safemode. Drivers can also be the...