As with so much 'street talk', a rumor based on a misunderstanding. Although we have made thousands of these speakers, I have never heard this comment, and I simply don't believe it is accurate.
Originally Posted by kevint
I designed both the HL5 and the SHL5. Dudley Harwood's last model was the HL Mk4 which ended production in about 1988.
The HL5, HL5ES and Super HL5 are fundamentally the same speaker. The HL5/HL5ES used the round Audax bass unit with the TPX cone and all three use the same main tweeter.
The later HL5ES2 and current SHL5 use the Harbeth RADIAL driver. The crossovers are very similar from the original HL5 right through to the SHL5, the SHL5 model having the extra components to drive the super-tweeter.
Alan A. Shaw
Harbeth Audio UK