Would adding a seperate equalizer to a aftermarket system have any benefits? The single DIN type.
Back in the day, 25 years ago. We used to add them to our car audio system to have better control and sound from our systems. Not sure it worked but we thought it did.
Is this out dated technology with today's head units or just not common on bikes because of space issues?

 

yes it does help, but the more modern way of doing it is buy using an item callled a DSP, Digital Signal Processor. they have built in and adjustable crossovers, Line drivers(some units), multi-band EQ, time alignment, input and output level control and such. all in a very small and easy to install unit. just a bit of a learning curve to get them dialed in well. Popular units for bikes are the RF DSR1, the ARC PSM and the DD Dsi-2.

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ITW that begs a question I have had for a while but keep forgetting to ask. Do any head units have separate EQ adjustments for front and rear channels or do they just have one EQ adjustment that applies to both like most head units do with the bass and treble controls?

 

Doubt you'll find one with separate EQ for front and rear but there's a bunch with separate crossover settings for front and rear. That in itself is worth a lot.