Simple inline audio bass boost circuit ?

M

Marcel Gonzalez

Jan 1, 1970
0
I would like to take a line-level audio signal and boost the bass frequencies
before amplification. Any leads on a good circuit / kit ?

Marcel

J

John Larkin

Jan 1, 1970
0
I would like to take a line-level audio signal and boost the bass frequencies
before amplification. Any leads on a good circuit / kit ?

Marcel

Two resistors, one capacitor:

in-------r1------+-----------out
|
|
r2
|
|
c1
|
|
gnd

The values depend on where you'd like the break frequency and how much
boost you'd like. Try r1 = 1.2k, r2 = 270 ohms, c1 = 1 uF, and play
from there. Use pots for the resistors, maybe, for easier fiddling.

Picky: this will actually attenuate the highs, not boost the bass.
Same thing, if you just crank up the volume to compensate.

John

J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that John Larkin <jjlarkin@highlandSNIP
4ax.com>) about 'Simple inline audio bass boost circuit ?', on Sat, 17
Jan 2004:
Two resistors, one capacitor:

in-------r1------+-----------out
|
|
r2
|
|
c1
|
|
gnd

The values depend on where you'd like the break frequency and how much
boost you'd like. Try r1 = 1.2k, r2 = 270 ohms, c1 = 1 uF, and play
from there. Use pots for the resistors, maybe, for easier fiddling.

Those values are really too low. The source impedance, if this is
consumer or semi-pro equipment, can be 1 to 2 kohms. 10 kohms, 2.7 kohms
and 0.1 uF/100 nF might work better.

It gives 13.5 dB of boost at very low frequencies, which may be too
much. Increase the 270 ohm/2.7 kohm to get less boost.
Picky: this will actually attenuate the highs, not boost the bass.
Same thing, if you just crank up the volume to compensate.

That's all you can do, practically, with a passive circuit.

N

N. Thornton

Jan 1, 1970
0
I would like to take a line-level audio signal and boost the bass frequencies
before amplification. Any leads on a good circuit / kit ?

Marcel

Why before amplification? Its much easier to put a cap in the nfb path
to give you bass boost - dont forget an R across it for dc and to
limit the boost.

Regards, NT

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