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RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's

I'd be hesitant to replace the ST350. It's a fine driver with low distortion. There's also the question of "bastardizing" a very nice vintage product by plugging in 3rd party drivers. Which reminds me - those Gefco woofers, they're not original either, are they? If you replace the ST350 as well, you really don't have a Sentry IV anymore, you've just got a Sentry IV box and midrange. That really diminishes the "vintage value" of them.

Looking through my old E-V data sheets, I can't find the Sentry IV - I must have tossed that one decades ago during a major culling. But, if memory serves, that driver has reasonably constant directivity up to a fairly high frequency, and the expectation was that some EQ would be employed to "flatten" the response both on and off axis. In other words, if you measure it on-axis, 30, 45 and 60 degrees off-axis, it remains relatively consistent in its FR, even though it rolls off. So, EQ'ing is not a problem.

Two other related things:

First, the ST350 is a T350 (not T35) with a different horn and less pretty motor housing, but is essentially the same driver. The T350 was designed to have flat on-axis response, but becomes increasingly beamy with rising frequency. The ST350's horn was designed to have a more consistent dispersion pattern over a wider frequency range.

Second, the Sentry IV was designed for high efficiency in the bass region and sacrificed very low bass output to achieve that and used a "utility" cabinet, while the Sentry III was designed for extended low bass and sacrificed some efficiency, and used a pretty "furniture" cabinet. The Sentry III employs the same midrange and tweeter, but uses a bass reflex enclosure instead of the Sentry IV's folded horn for the low end.

While the two products are similar, and in fact identical in some respects, their designs were intended for two different applications: The Sentry III for high fidelity wide frequency range applications such as high output hifi use or small/medium size nightclubs; and the Sentry IV for applications where high output within a slightly more restricted frequency range was more important than extended low frequency performance, such as auditoriums.

With all that being said, if you insist upon replacing the ST350s, I'll take them off your hands.

Edit: IIRC, you've done quite a lot of work on those cabinets, and have shown us some more recent photos. What's the latest status on them?

:)


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