I am hip to the SAMMI drivers too.
Some look quite impressive, and prices seem very reasonable.
They SURE have a large selection.

I have nothing against Korea, been driving Daewoo's for years.
Hyundai's are reliable cars, not so sure about Kia's ?

I know you are using fiberglass in your tuves, but have you ever considered Kapok ?

Do a Google Search for Kapok speaker damping, and the US Patent will come up.
Check out the Patent claims ?

I learned about it from my Kid.
He does Bass Competition, and many of the Bass sound off champs use it instead of Fibefgalss and Wool.

I have used it, and feel it is superior to fiberglass.

But, that is only my opinion, and have just my seat of the pants feel to back me up.

The PVC tubes might allow easy damping experiments in your design.

You can try different materials, and graduated density of the materials themselves ?

I wish you lived here in Tampa, I would love to hear those speakers!

BTW, when you said CHEAP drivers, I thought of some transistor radio cheapies, LOL

The SAMMI May be a cheap driver, but it is FAR from a shit driver.

The X Max alone of the little guys tells you that!

You got one hell of a deal, jumped on it, and now you got your babys!

As an audiophile, I share your excitement.

I was gonna buy Fred in Texas Needles array he had for sale, but he is in Texas, me in Florida!