Unfortunately only if you’re using a computer as a source. If you’re not your options are more limited. I use an RME ADI-2 DAC for headphone EQ since I don’t have a computer in my headphone chain, but I’d love it if someone made a dedicated digital-in/digital-out parametric EQ box with a lot of memory slots and more PEQ bands than the RME has.
I almost hate to mention this....a Q-Sys Core110f running QSys Designer software ..... because i hear supply chain issues have disrupted new deliveries out to Q1 2023, and used 110f's have been selling above the list price at $3300. Pre covid, $1250 or so was all anybody had to pay on ebay, with a little patience.
But despite current supply/price issues, i believe it helps to be aware of options like QSys, as I think this is where the DSP market may be heading.
Anyway...QSys is open architecture design. You draw up a schematic on a PC/MAC using QSys Designer, and then the software compiles the schematic into Linux running on the hardware Core110f.
Equalizer capability now.....
graphic:
The Graphic Equalizer provides from 6 bands with 2 octaves per band up to 61 bands with 1/6th octave per band. Each band can be adjusted from -20dB to +20 dB.
flat top graphic parametric:
same band capacity as graphic
(I'll contrast these two types of graphic in a minute...
parametric:
The Parametric Equalizer is a variable equalizer allowing you to individually adjust the Gain, Bandwidth and center Frequency of up to 32 frequency bands. You can also Bypass individual bands. Master controls, affecting all bands, include Bypass, Invert, Mute and Gain. Additionally, you can change any or all of the bands to either a high or low-shelf equalizer.
flat top parametric:
same band capacity as parametric
(will contrast the two parametrics too)
Any of these EQs can have multiple instances in the design schematic. Iow, you can have a bank for varying track tonality, and another one for room EQ, etc.
Each EQ can be mono, stereo, or multichannel.
Ok, here's a screenshot of graphic vs flattop graphic.
I chose 16 two-thirds oct bands for a simple view.....(61 1/6th oct bands makes for one wide screen lol)
Same eqs setting are in both.
Note how the flattop gets rid of the ripple in adjacent bands. And how the phase shift is a bit more gentle.
It's not a big deal, but cool to have i guess.
Ok again, now parametric vs flattop para.....this one is more interesting imo....
Settings are not the same, because the two are not trying to do the same task, like in the graphic.
The Parametric is just to show the settings block. Note you can use either BW or Q, which are linked together. Up to 32 bands.
The flattop allows each side of the EQ to have its slope set independently of the other side.
A couple of examples are shown, an asymmetric at 420Hz, and a symmetric flat top at 3.6kHz.
I've found the flattop para works very well for quasi-anechoic speaker tuning like the 420Hz example, and also for tone control when used flattop and shallow side slopes.
Saved the best for last
Any control from the design schematic, from simple overall volume to any of these EQ settings, can be placed onto a control screen on a Win or OS device, that is connected to same network as the Core 110f . You can put any remote control you want on an Iphone for example. And customize the appearance/action of the control element.
I use a touchscreen PC.
Admittedly touch screen faders and knobs are not as much joy to use (for me) as real faders and knobs,
but it's kind amazing how many live sound guys are now
mixing shows on tablets controlling their mixer...so i know it's mainly a matter of habit....
Hope this was interesting and not OffT...