Bass boost circuit - need steeper slope

[BradtheRad]

I have inexpensive Sony computer speakers, just about adequate to play my favorite music videos on Youtube. Sometimes the bass drum is heavy, and the speakers 'bottom out'. I can choose to turn off the speaker's 'bass boost' or I can reduce the volume. Neither is ideal, of course.

Windows Media Player has a parametric equalizer which I often use. It has individual adjustments, 31 Hz, 62 Hz, etc. This allows customized frequency response.

I wish there were an equalizer which intervenes between Youtube and the soundcard.

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There are other types of tone controls, eg., bass control which has 2 capacitors. A forum search on 'baxandall' will turn them up.

 

[David Kosman]

I wish there were an equalizer which intervenes between Youtube and the soundcard..

There is: **broken link removed**
You'll need to download EqualizerAPO next to it, I believe.

 

[David Kosman]

Hi again,
so I found an active filter which fits my needs, it's Linkwithz Transform.



Sorry for my poor knowledge, but I'll better ask before I purchase something wrong.
The circuit had operational amplifier, should I buy that or a power amp? Some little more gain would be nice, because
I'd like to use it as portable.
And, I want to use another two op-amplifiers behind it (for highs roll-off), would I success powering all 4 amps? I saw that many amps need at least 4 Volts, I don't know if I would get it from a battery, or USB which is 5V.
And eventually, is there a way to bring the bass boost down on it (putting a resistor somewhere)?
thanks and sorry for my english

 

[Audioguru]

The Linkwitz Transform circuit is designed to boost the bass of sealed speakers that can handle very high power, not cheap low power bass-reflex speakers.
A cheap speaker "bottoms out" when the power to it is increased, especially a bass-reflex speaker whose port produces out-of-phase sounds below its designed cutoff frequency so boosting the bass does not increase its bass sound levels much.

You do not know if your speakers can handle 10 times as much power anyway (probably not) and you do not know if their power amplifiers can provide 10 times as much power as now (also probably not).

You show an opamp that has only a positive 15V supply but it is missing a minus 15V supply for a total of 30V. if you use opamps that work from a supply that is only 5V then the circuit must be changed so that the opamp is biased correctly but it will bottom out anyway because 5V is not enough voltage.

The circuit does not have an adjustment to reduce the amount of bass boost. Parts of the first circuit you showed (a passive bass tone controls circuit) will do it.

 

[David Kosman]

I'm gonna use it for headphones, not speakers. I am so glad that I have found this filter, because of its steepness (I know what I'm doing, trust me).

The supply in the image is 5V, but it doesn't matter in the software. When I connected the ground of the supply to amp ground, whole signal went to like -35dB.

In this article https://makezine.com/projects/bass-bump-headphone-amp/ they used 2 power amps, with each having lowest voltage of 4,5V, but they used USB (5V) to power them both, which I don't understand.

I will now probably buy one chip with 4 amps at least to get it working.

 

[Audioguru]

The bass boost circuit uses a positive 15V supply and a negative 15V supply but the schematic is missing the negative supply. It does not need a total supply of 30V and an opamp that works at lower supply voltages can be used and can be biased at half the supply voltage then the negative supply is not needed.

The LM386 power amplifier IC can be powered from a 9V battery or from +5V USB.