R
RHSmith
Enthusiast
I agree with you summation of the AR's crossover being in need ore some serious redesign on the AR2,AR3a, AR4(x).. I think they started to figure this out about the time that AR-9/10 came along.. They were vastly better sounding then the older series speakers and brought with them many design improvements along with an understanding of the relationship of driver alignment. They also brought a first to the industry with the acoustic lens treatment of the tweeter which improved the upper imaging considerably and the dual side-firing woofers were a first as well.. Few speakers had low end performance that could rival them. Tight, hard hitting and smooth down well below 30Hz and able to handle the most powerful amplifiers of the day (Phase Linear 400/700, SAE 400, BGW 250/500, etc..) and delivered rock crushing performance.Thanks Gene--great article. And thanks in particular for showcasing the KLH 5. I thought I was the only one who realized what a significant speaker it was.
I owned a pair for 20 years. A quibble or two on the AR discussion. The early AR's obviously belong on the list. But they were in fact highly colored speakers. All of them suffered from the same flaw (other than the haphazard driver placement). The simple, text-book crossovers failed to control for diffraction peaks at the bottom of the midrange (AR3, AR2, or tweeter (AR4x). My first speakers were AR4x, which I roundly hated. I thought the murky sound was due to a depressed tweeter, but when I got hold of a pair a few years back I discovered the issue was really a broad, veiling 5 dB peak at around 1200 Hz. The 3a had the same issue, but at around 800 Hz. It was worse than on the original 3, which was really the superior speaker. I've redone all of the class AR's, and it's amazing how good they can sound with the original drivers despite their screwy baffle placement. The driver engineering was amazing. The crossovers, not so much.
Did I think you missed anything? I think I would have bumped Thiel off the list for the Dahlquist DQ-10. It was the first to really stress time-aligned drivers and phase relationships. I'm sure not all of the theory holds up, but the sound was a step forward despite the cheap tweeter and somewhat bass-challenged woofer.
I agree here with you about the Dahlquist bumping the Thiel off the list. The DQ-10 were a really impressive sounding speaker with the only real flaw being the ratty sounding $1.00 piezo tweeter and they were a bit short on the bottom end.. I met John Dalhquist when he came into our store to evaluate his speakers and to see why we were setting the crossovers on fire (driving them with big amps like Mac 2300/2500's, SAE 400's, Phase Linear 400's).. We also demo'd them against some others we had in the store (@Square Deal, Patchogue, NY) and he admitted that the bottom was not what it should/could have been.. But we were not able to convince him about the tweeter... But they did sound good when driven hard... just had to let them cool off between songs..