If you buy a pair of Lowthers, make sure you test the T/S paramaters before using them. I love these drivers but ...........

Martin

Glads to see you here! Don't stay a stranger so long. You've been sorely missed. When you're not here, we all just ask each other about you anyway.

I understand you've measured electro-mechanical parameters for various Lowther drivers. Would you be willing to share the specs here?

Or does Lowther allow such manufacturing variance that there is significant difference between units?

I received a pair of PM6A drivers yesterday and hope to measure the "out of the box" T/S parameters tonight. At that point I will have seven pairs of Lowther drivers in various states of break-in and I will post a summary of the T/S data.

Hopefully, in the coming months I will post detailed T/S and SPL data for all of them like I did for the DX drivers already.

Martin

Do you use sealed box or added mass measurements? Constant current, constant excursion or constant voltage?

Most folks use sealed box and constant excursion, i.e. test box and approximately 10 ohms known-value series resistance.

I tried the closed box method and really did not like it because it required you to estimate the volume of the back of the driver and magnet inside the box or the front cone volume if the driver was pointed into the box. This change for every driver.

I use a 10.1 ohm series resistor in my set-up and an old Teac receiver to supply the signal. This also allows me to play music for a while before making a measurement.

This Option B sound very appealing to me and is definately the route I'd like to explore for my next project (whenever that is).

What do you consider to be good options for the primary driver in this setup? Fostex and Lowthers are obvious choices, but are there others?

Gar.