What is the Electro-Voice Sentry III Equalizer, Boost Frequency?

[jorb]

What is the Electro-Voice Sentry III Equalizer, Boost Frequency?

 

[Ths364]

EV is very good about providing documentation on their website. You're going to want to know how many db's boost, and roll-off too.

 

[totem]

Ths364

EV is very good about providing documentation on their website.

Scant specifics other than max 6db boost applied between 38Hz and 28Hz.

 

[grindstone]

In case close-enough is useful

Something I pack-ratted from somewhere.

 

[jorb]

Something I pack-ratted from somewhere.

The 2 resistors in the schematic I think say 13K and 220K.
That works out to 32 Hz.
I'm not sure of the values, it is a little fuzzy.
Maybe you could snap another photo.
Sentry III & Sentry III series II EDS say 28Hz, 6 db boost
Sentry III explanation brochure says 32Hz, 6db boost

Seems like it is suppose to be 28Hz.
That is what the speakers resonance is with the bottom vent covered.
Also your schematic says Interface A is 35Hz,
I believe the Interface A eq box frequency is 39Hz, 6db boost.
Unless EV had changed frequencies with different series of interface speakers.

 

[grindstone]

Sorry jorb, that's all I have and I'm very-much in the dark regarding the intricacies of these lines. Hopefully someone more knowledgable/informed will weigh-in. I just took a shot in case something was better than nothing.

 

[LPD]

Interesting. I just picked a pair of EV Sentry IIIs for my sister. Refurbed surrounds and hooked them up tonight and thought they were pleasant sounding speakers. Very smooooooth horn and warm mid band. Not near as deep in the bass department as my Waveform Machs but a speaker I could easily live with.

 

[totem]

I was reading through some Sentry III info on AK and came across a comment regarding the weak bass.

In this instance it referenced a difference in the crossover between the MKII and the original version. MK II being better in low end response.

By the same token adjusting the connections internally as per EV its easy to bi amp and have more control of the lower end.

 

[jorb]

I was reading through some Sentry III info on AK and came across a comment regarding the weak bass.
In this instance it referenced a difference in the crossover between the MKII and the original version. MK II being better in low end response.

The only difference between the SIII & SIII series II crossovers is the resistors on the midrange horn.
There is no difference in the woofer circuit.
Notice both schematics show, midrange & tweeter are out of phase. (positive is on the ground) But the crossover puts them back in-phase.
The SIII series II has a light bulb on the TS Tweeter Saver.
Here are the schematics for SIII and SIII Series II