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FDP Forum / Guitar Mods, Repairs, and Projects / How much volume drop with bass contour control?

Tinkerer
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San Diego, CA USA

Sep 3rd, 2019 09:51 AM   Edit   Profile  

I've got a new build started for a one pickup guitar which will have a Railhammer Tel P-90 in the neck position. I am thinking about putting in a bass cut pot to give the option of more a lead tonal option, but am wondering about how much volume loss I would have with that kind of a set up when I cut the bass frequencies?

Leftee
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VA

Sep 3rd, 2019 10:11 AM   Edit   Profile  

I haven't noticed a volume drop with my Reverend. It's a very useful feature.

Leftee
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VA

Sep 3rd, 2019 10:56 AM   Edit   Profile  

To clarify...

My experience is with my Reverend Super Rev with a single railhammer in the bridge.

Peegoo
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If irritation occurs

discontinue use.
Sep 3rd, 2019 01:10 PM   Edit   Profile  

Yeah, it's not much of a volume drop, if any.

The "bass contour" control actually affects the mids more than the bass frequencies. As you roll the control, the mids become more present. That makes the guitar a bit punchier in a band mix.

Tinkerer
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San Diego, CA USA

Sep 3rd, 2019 02:34 PM   Edit   Profile  

Thank you!


Leftee
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VA

Sep 3rd, 2019 04:17 PM   Edit   Profile  

It’s bad-ass on my Rev.

Tinkerer
Contributing Member
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San Diego, CA USA

Sep 3rd, 2019 10:10 PM   Edit   Profile  

My understanding is that Reverend is very protective of their circuit. Does anyone know if theirs is different from a "typical" bass cut circuit that is readily available on the web?

ejm

usa

Sep 4th, 2019 09:37 AM   Edit   Profile  

To add to the confusion......

G&L has had a bass cut control on some of their guitars for a couple of decades.
I found a schematic once on the internet and implemented it on a guitar that I had.
Ultimately, I found that I didn't use it as much as I thought I would.

You can try it and see if it's a fit for you.
If not, a graphic EQ pedal like the Boss or Danelectro might be the ticket.
Not only will it EQ much more than a single knob on a guitar, but you can also use it as a boost.


Achase4u
Contributing Member
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U.S. - Virginia

Sep 5th, 2019 06:50 PM   Edit   Profile  

I think every electric guitar would benefit from one. I loved it on the Revs I've tried. Makes setting up recording tones way easier too. Esp with a one or two knob amp.

Mick Reid

Australia

American-made in Oz!!
Sep 5th, 2019 07:33 PM   Edit   Profile  

“G&L has had a bass cut control on some of their guitars for a couple of decades.“

I really like Leo’s PTB circuit in G&L’s. The only reason I haven’t added it my strats is I’ve had great difficulty finding the 1M reverse taper pot needed for the bass control.


Peegoo
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If irritation occurs

discontinue use.
Sep 5th, 2019 10:15 PM   Edit   Profile  

Another cool control is the midrange control that Dan Torres used to sell as a kit.

You can still get the parts from Mouser and Digi Key and do it yourself. I have this in three of my Strats because I need only one tone control--which frees up a pot spot for a useful thing like this.

The "1.5H" component is a little bitty transformer used as an inductor. The rating is 1.5 Henries.

Looky

(This message was last edited by Peegoo at 12:17 AM, Sep 6th, 2019)

Tinkerer
Contributing Member
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San Diego, CA USA

Sep 5th, 2019 11:32 PM   Edit   Profile  

To Mick's point - the circuits I have found online recommend using that 1 Meg rev audio taper pot. How would the performance be different with a linear taper or standard audio taper pot?

Thank you all!

Mick Reid

Australia

American-made in Oz!!
Sep 6th, 2019 01:52 AM   Edit   Profile  

Tinkerer - I think you'll have better luck finding 1MC pots living in the US.

My difficulty has mostly been getting them to AUS from overseas. The exchange rate; shipping and import tax has made it cost-prohibitive.

If you can't find them anywhere else, try the G&L Parts site. They're available there.

G&L link

Tinkerer
Contributing Member
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San Diego, CA USA

Sep 6th, 2019 07:28 AM   Edit   Profile  

Thanks Mick. I'm wondering about the difference between linear and reverse audio taper, because I'm thinking about using a slider type pot instead of a traditional rotational type. It will look like a blade type selector switch, and I'm hoping the bass contour circuit will effectively give me rhythm and lead tonal differences. I can find 1 meg slider pots in linear or audio taper, but can't find them in reverse audio taper. I'm going to need to route the body for the slider pot, and am wanting to get a sense of whether or not a linear or audio taper pot would work okay enough for a bass cut control before I do the body route.

Cal-Woody

USA/California

Why do I keep fixing things that work?
Sep 6th, 2019 10:07 AM   Edit   Profile  

As you know, a linear taper control will always be an slower level adjustments to your ears as an audio taper control is better suited for your playing technique.
If this guitar was for studio use and not for a live situation, then I would think that having a finer control over the bass contour switch would be optimal. For a live situation, I think that an audio taper control is better because it adjusts quicker to your hearing needs.
After playing around with it, you would learn how to position it and either would be fine, it would be just a learning curve.
Best regards, Woody

Peegoo
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If irritation occurs

discontinue use.
Sep 6th, 2019 12:32 PM   Edit   Profile  

Yeah, either would be fine because it's a tone control.

Audio taper potentiometers were developed specifically for controlling volume level based on how the human ear perceives changes in volume.

A linear-taper pot used as a volume control gets loud too early in its sweep to be useful. Sometimes a guitar maker goofs and uses a linear pot for the volume control. You know right away because once you get to 4 or 5 on the dial, it sounds like it's maxed out; 5 through 10 makes little or no change in volume.

The audio-taper pot was originally called a "log" (logarithmic) taper pot. The progressive sweep is logarithmic to accommodate more 'turn' on the pot at lower volume levels to provide precise control of the desired sound level at lower volumes.

For tone control, an audio pot works as well as a linear type. It does affect the rate at which filtering (the capacitor, etc.) is brought into the circuit, but it's not as critical as the rate of change in volume. This is why we often see guitar makers using audio and linear pots for tone controls. Like Cal-Woody states, we get used to it pretty quickly.

Scientitious scribbles here

Achase4u
Contributing Member
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U.S. - Virginia

Sep 6th, 2019 02:29 PM   Edit   Profile  

I think it would be fun to put an FFT or wide band white noise through the bass contour to plot what it's doing.

Audio taper/Logarithmic is the same for faders on a console. They are just straight potentiometers on a slider. The most fine control you have is around -12 to +12. The closer to the bottom you get, the more scrunched up the numbers become.

Tinkerer
Contributing Member
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San Diego, CA USA

Sep 6th, 2019 02:40 PM   Edit   Profile  

Thank you all!!


FDP Forum / Guitar Mods, Repairs, and Projects / How much volume drop with bass contour control?




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