Adjustable speaker crossovers

March 26, 2021
 by Paul McGowan

12 comments on “Adjustable speaker crossovers”

  1. If you have crossover level controls on a speaker and you change the level of part of the bandwidth relative to another don’t you also slightly change the crossover point? Say you raise the tweeter compared to the mid range isn’t the crossover point now lower? And, of course, is this change significant and is it good or bad? After all the crossover point was initially designed with given level settings, most likely with overall flat response.

  2. Yay. Thanks for fixing the smart phone video access issue Paul. I had a pair of BIC Venturi formula sixes that had a mid range adjustment on the front. Those were great speakers.

  3. My Infinity Kappa’s and Preludes had those controls (Preludes had RABOS, which was kinda wild to plot out room response).

    Pretty sure I’ve seen these controls on modern day Revels. I always thought the Revels probably had Infinity DNA due to the Harmon relationship.

  4. Cerwon Vegga yoost to make speakers that had controls for razing and lowering the mid ranges and tweeters.
    Also, a few of the Radioshack brands of speakers had that same feature.
    But today, JBL still puts that feature in their top of the line speakers.
    Just check out the JBL L-100 Classics, and you’ll see what I mean.
    But to tell you the truth, I would love to have a pare of those in my hands man!

    1. True that, I’ve got a pair of Altec 846B with that tight L-Pad where you can really feel the indents of the pot as it rotates. The old classics had the quality controls that would give you the “ZZZZZZ” feel as you rotate them. I tried the Altecs outside my shop and powered them with a big old Rotel and with the echo of the area – it was just like being at a concert!

  5. Paul, I’m shocked!

    I would have bet big bucks that you wouldn’t have wanted any kind of pots or L-pads between your amp and the drivers, the same way you don’t have tone controls on your preamps.

    1. Yeah I’m also a little surprised. I would’ve thought that you’d look at setup and room treatments before messing with the crossovers or individual driver levels.

  6. My EPI 180 and some other EPI models had a selector control you could set for the tweeter. High low or normal. That tweeter had a 6db per octave single capacitor crossed over at 1800 hz. The woofer and tweeters were designed to have natural slopes to integrate with each other so the high pass capacitor only removed the lows from the tweeter. I always had it set at normal.

    I don’t like to mess with the sound with electronic or passive devices. I have used equalizers with spectrum analyzers and microphones just to test where the room frequrncy problems are but I try to correct it without having to use my EQ frequency controls.

    I have two in the box Technics EQs I bought for great prices. They don’t have slide controls, its all electronic and I can save multiple frequency settings. I also have an analog frequency tester with microphone by Technics that works similar to a spectrum analyzer but you cannot alter frequency, its just a tester. My other device is an SPL meter for testing sound pressure levels.

    Also a Velodyne subwoofer EQ with electronic preset controls, a microphone and it has a continuous crossover point that can be set from 6db on up to above 70 db slopes. It can be hooked up with balanced or unbalanced cables.

    All of the units have defeat switches or full signal pass through to take the units out of the circuit. My preamps either have no tone or balance controls or defeat switches to bypass them.

    What good are any frequency adjustment devices if you don’t have a spectrum analyzer of some kind with a microphone? Not many people make accurate adjustments by ear. They usually just color the sound worse than keeping everything flat. And simple tone controls have a single preset frequency, theres little chance that single frequency could be where the problem is occuring. You could be adjusting a frequency that has no problem to make up for the problem frequency.

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