Here is a well built, nicely thought out Chinese car audio driver. It has a nice frame with under spider venting and a vented back side. The machined trim might be a turn off for some people - but (imo) lends a nice contrast to the all black cone and surround. The cone is machined aluminum, concave dust cap, rubber surround and flat spider. Peeking through the under spider vents, it looks like around 5-6 mm of coil showing.
They are still warming up from being in the mailbox, when they are at room temp I will exercise them and take some sweeps. Out of the box, they exhibit high compliance with a semi-loosey goosey suspension and GOBS of mechanical throw, and I am talking at least 12mm one way of throw. The soft parts act as an arrest - I could not bottom things out so a bumped back plate is likely not necessary here.
It is a true 165mm driver, meaning it will drop into stamped frame cutouts, although the lip is a few mm shallower than the typical gasketed 6-1/2" woofer so for flush mounting in existing enclosures a thick gasket may be required.
This is a damn fine looking driver, although at the imported price of ~$60/ea probably is not a good absolute value. The advertised specs do nto mention shorting rings etc, so... I have a specific purpose for this driver, I wanted something better than the stamped frame stuff out there but do not want to modify the enclosures to accept a cast frame driver. This fit the bill, had excellent T/S parameters, etc.
Here it is from the front (pardon the potato quality of my cell phone):
...and here is the ass:
You can see the very long throw potential in the basket design. Note the top plate is machined, which is nice. This really is a nicely built driver.
I'll get T/S in an hour or so, I'll set them on the furnace duct.
I have a signature.