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Electrovoice Interface B Series 3 Brochure
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Michael-Otto
Well-Known Member
You need a B EQ, or you can use any other Interface EQ (A,C,D) you must only change 4 resistors.
From a EV flyer.
The Equalizer
Interface:A, B, C and D come with an active equalizer, an integral part of their Thiele design. The effect of its low-frequency contouring is dramatic. For example,
the equalized Interface: A is about the same size as the unequalized EVS 9A yet has 10 Hz more bass. At the same time, a filter removes distortion-producing subsonic
rumble. The equalizer also tailors high¬frequency response to your room's acoustics.
Michael-Otto
From a EV flyer.
The Equalizer
Interface:A, B, C and D come with an active equalizer, an integral part of their Thiele design. The effect of its low-frequency contouring is dramatic. For example,
the equalized Interface: A is about the same size as the unequalized EVS 9A yet has 10 Hz more bass. At the same time, a filter removes distortion-producing subsonic
rumble. The equalizer also tailors high¬frequency response to your room's acoustics.
Michael-Otto
spkrdtr
spkrfixer
ElectroVoice Interface A speaker a somewhat unique design
I've recently finished repairing (new, filleted woofer foam) and upgrading the crossovers on a pair of Interface A's. Very interesting speaker. Quite thin (internal F to B ony about 5") and a box vol. of only about 0.7 cu. ft. However, much low end extension obtained from the combination of 8 inch woofer and 10 inch PR. I've seen this design concept (thin and small woof & larger PR) applied before in the rare but valued Kindle PHantom speaker.
Below are some photos of the Interface A with closely aligned woofer, 2 1/2 inch cone tweeter and PR. Later models showed some deviations in type and position of the tweeter. Seems it's something they couldn't get nailed down.
The Interface A has two tweeters of the same construction which look very much like (could be the same) those used in the Microstatic Arrays sold to supplement the AR speaker line.
Also attached is the on axis response that include 5 different measurements
1) composite @ 50 inches
2) Nearfield (NF) on the woofer
3) NF on the PR
4) NF on the front tweeter
5) NF on the rear tweeter which seems to be xovered at a higher level.
The speaker includes an active equalizer (same used in later models) that serves to provide a rumble filter, some bass extension (-3dB down into the upper 20's low 30 hz region) and 2 levels of tweeter attenuation. I measured the nearfield SPL response of the woofer and PR and found the PR to be about 10 dB less than the woofer. PM me for SPL measurements assessing the effect of the EQ.
I've recently finished repairing (new, filleted woofer foam) and upgrading the crossovers on a pair of Interface A's. Very interesting speaker. Quite thin (internal F to B ony about 5") and a box vol. of only about 0.7 cu. ft. However, much low end extension obtained from the combination of 8 inch woofer and 10 inch PR. I've seen this design concept (thin and small woof & larger PR) applied before in the rare but valued Kindle PHantom speaker.
Below are some photos of the Interface A with closely aligned woofer, 2 1/2 inch cone tweeter and PR. Later models showed some deviations in type and position of the tweeter. Seems it's something they couldn't get nailed down.
The Interface A has two tweeters of the same construction which look very much like (could be the same) those used in the Microstatic Arrays sold to supplement the AR speaker line.
Also attached is the on axis response that include 5 different measurements
1) composite @ 50 inches
2) Nearfield (NF) on the woofer
3) NF on the PR
4) NF on the front tweeter
5) NF on the rear tweeter which seems to be xovered at a higher level.
The speaker includes an active equalizer (same used in later models) that serves to provide a rumble filter, some bass extension (-3dB down into the upper 20's low 30 hz region) and 2 levels of tweeter attenuation. I measured the nearfield SPL response of the woofer and PR and found the PR to be about 10 dB less than the woofer. PM me for SPL measurements assessing the effect of the EQ.
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WRX22B1998
New Member
sorry for the bump >.<
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