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Old 23rd July 2015, 12:33 AM   #1
diyAudio Member
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Default Passive Bass Boost circuit?

Could I make one as simple as a resistor and capacitor in the right order with the output (or input) ? It doesnt have to be a huge cut-off from the high frequencies but something so the bass is more noticeable at higher volumes?

Could I do it like this?
with the resistor in series between one of the wires (not parallel) going to headphones and the capacitor after the resistor (the place closer to headphones) in parallel between both wires?

Its a bit hard to describe but I hope it can be understood what i'm getting at

and can i also increase treble while bass boosting passively at the same time? or is that a whole different can of worms?
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Old 23rd July 2015, 12:53 AM   #2
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You could, but you probably wouldn't be satisfied with the results. You can't boost passively. The bass boost is actually an attenuation of midrange and treble.
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine
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Old 23rd July 2015, 01:01 AM   #3
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Well, first of all, a passive "boost" is almost always going to be a "cut all the rest".

What you want for a bass boost basically is a shelving filter. R in series, R-C in parallel. (For a highs boost it should be R||R-C in series. I would think you could combine both.)

Too bad there'll be some interaction between this and both source impedance and the (generally) not-terribly-constant headphone impedance. Which is why nobody does it that way.

You may be better off stating what problem you are actually trying to solve, and what the equipment at hand would be.
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Old 23rd July 2015, 01:53 AM   #4
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headphone output jack from a desktop computer. headphone cord and
32/34 ohm headphones
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Old 23rd July 2015, 02:13 AM   #5
DUG is offline DUG  Canada
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Doesn't your player on your computer have any tone control functions?
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Old 24th July 2015, 03:00 AM   #6
wwenze is offline wwenze  Singapore
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The RC filter itself is passive components.

But usually it doesn't work properly without some opamp before and/or after it to isolate it from the source and load impedances.
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Old 24th July 2015, 04:57 PM   #7
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Originally Posted by DUG View Post
Doesn't your player on your computer have any tone control functions?
Or an EQ, for that matter? A number of them ought to work as long as you keep things out of clipping (only cut or pull down pre-gain). I like foo_dsp_xgeq as a graphic EQ for Foobar2000, does its job and nothing else (unlike Foobar's stock EQ, an FFT-based job that creates steps in frequency response with the associated ringing in time domain).
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Old 24th July 2015, 06:49 PM   #8
sreten is offline sreten  United Kingdom
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A simple 33R resistor with a inductor in parallel,
put in series with the phones, gives +6dB bass.
To be strictly accurate -6dB midrange/treble.

rgds, sreten.
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