I am sure the older members will remember these woofers

[Mike B.]

They were the SOTA in the 1970's. I saw a couple huge transmission line bins around the Portland, Oregon area utilizing them back then. I think the 18 inch model was preferred.

Hartley 24in subwoofers For Sale - US Audio Mart

 

[puroagave]

Hartley was the "H" in Levinson's HQD system. (Hartley, Quad, Decca).

 

[Jim Smith]

Hartley was the "H" in Levinson's HQD system. (Hartley, Quad, Decca).

I remember helping a famous Levinson dealer improve his HQD setup back when I was Magnepan's National Sales Manager.

When setup well, they were amazing.

I wonder how - or even IF - they'd compare to today's top efforts?

 

[Kingsrule]

I heard the HQD at Alan Goodwin's on Newbury Street many times.....it was an ear opener for me.
I'll bet there are a few of these still around the Northeast......