Do Your Speakers have LEVEL CONTROLS or EQUALIZERS? (Vintage or Modern) ???

Ralph,

Electro-voice provided one AT-37 Level Control for their 2 way's (8 or 16 ohm versions)

and two AT-37 Level Controls for their 3 way's (8 or 16 ohms).

Their literature is clear: to adjust for 'live/hard' rooms, or 'soft/dead' rooms (of various degrees of soft or hard of course); for various locations in a space; for an individual's preference.

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Lewm's opinion: best, for 'easily' matching left to right, is a resistor based level control. Certainly easier to match l/r frequency response than continuously variable L-Pads.

Either type can be adjusted differently l/r for a particular condition in a space, like my AR-2ax's in my office: left speaker against a wall, right speaker not near walls

Electrovoice's 4 way Model 6 (18" woofer)

has a 5 step resistor based Level Control, with published graphs of the frequency response of each of the 5 settings

https://products.electrovoice.com/binary/E-V%20Six%20EDS.pdf

Page 2, adjustment of balance control, is all about different spaces different tastes.

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Their monster Patrician 800 (30" woofers) had level controls

https://skyfiaudio.com/products/electro-voice-patrician-800-vintage-speakers-4-way-with-30-woofers

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A speaker's impedance, then and now was and is nominal, and typical crossovers are designed for the nominal impedance, and transformer taps also anticipate a speaker's stated nominal impedance.

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Canton 9k 2 way stand mounted  have no controls. As an aside they are outstanding.

Level Controls: especially continuously variable type are: Easy to Screw Up, Hard to get ’right’, then: to taste, or to your specific hearing ability. Set in the middle, leave them alone, or use them as needed/desired.

For many years, I would get a friend over, in a specific space, and simply mess with the balance controls until I, with my friends help, got what I thought ’best’, in that space, in that location, with ’that’ toe-in. All by younger ears.

Adjusting base for tilt, to aim tweeters at seated ears came later.

Infinite Slope Model 2’s with Slanted face also alters the angle of reflection from floors and ceilings, as does toe-in from side walls.

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Covid Times, home all the time, unspent money, I upgraded my entire system

Including a much more careful adjustment/matching of my 3 way speakers

1. Mess with toe-in, two alternates for best imaging

a. one listener dead center

b. two listeners, small drink table centered

2. Buy Inexpensive SPL with bottom fitting for Tripod Mount (ear height/listening position

3. Find my Amazing Bytes CD with Test Tones: tracks 9-38 of this CD

https://www.discogs.com/release/7290000-Various-Amazing-Bytes

4. Make enlarged copies of that page to write adjusted results on

Back and forth, back and forth, sleep on it, back and forth

5. McIntosh Preamp’s Mode Control, Stereo Reverse, L to both; R to both ... page 8

https://www.thetubestore.com/lib/thetubestore/schematics/McIntosh/McIntosh-MX110-Z-Series-Owner-Manual.pdf

6. VOICE Tests, Voice (and Instruments) cannot wander from their positions as frequency varies

a. Cassandra Wilson, Blue Light Till Dawn

b. Barbra Streisand/Donna Summer Duet, Enough is Enough

c. Richard Burton, War of the Worlds

d. Annie Lennox, Eurythmics, Sweet Dreams

7. Hearing Ability: even though the microphone hears the highs ’equally’, I am 74, I don’t hear highs as well as the mic does, So, raise the tweeters a speck at a time, get the wife to listen (women hear highs more than men), get my neighbor recording engineer over: raise, but not too much. Eurythmics is helpful for this. Get my younger audiophile friend over here (very familiar with my system).

Not only best frequency for me in my space, the refinement of Imaging is revealed. The better you get your imaging, the more sensitive you are to great or not so great imaging, dumb decisions like having Max Roach right side, but moving Max to the center during solos.

Now you love remote balance to make slight changes that make a bog difference. All imaging id Phantom, based on balance of L/R to create/locate ... here or there.

Slight adjustment of balance improves Imaging of whole album or individual tracks (recorded different times/spaces/engineers).

Gotta get it right, it ain’t easy, but wonderful results after careful work.

Move to a different space: here we go again!

Of course, the big item I haven’t touched on, besides reliability is power.

All resistive elements waste power, and as those contacts get dirtier the switches and knobs will waste even more power and heat them up.

Modern, passive, multi-way speakers simply can’t avoid using resistors, that’s a matter of fact, but the more of this we can move to the active realm (i.e. low voltage/low current) the better we are.

IMHO, the least audible, most reliable methods of doing this is how Wilson and other high end makers have done it, by using either replaceable resistors or plug in networks that allow you to select the right resistive value through a jumper wire.

Any pics?