Hi! I am looking to mod my Metal Zone, but unlike alot of people I don't need to do very much to it. I am removing the post-distortion EQ, as that's where most of the bad tone actually comes from. this is easy, and I can do that already.
But I also kind of want to change the pre-distortion filter a little. I literally just need to widen the Q of that peak.
The exact part of the circuit is described here, under the section "Pre-distortion tone shaping": https://electricdruid.net/boss-mt-2-met ... -analysis/ ?
I need to move the upper and lower cutoff frequencies of the bandpass filter. I am a huge fan of the Klon curve myself, so it can get quite a bit wider than the narrow peak that it has stock. I would also be happy with something tubescreamer-esque here, as that's also less peaky and narrow. I don't need something crazy wide, just more natural sounding.
Does anyone know how this could be done? I am very green with electronic components, even if I know what they are capable of. I am guessing I need to change two components for something with different values?
Thanks for any help you can give me guys!
Metal Zone: how to widen the pre-distortion filter?
Information
hi!
the easiest way to get exactly what you want would be to throw it at a circuit simulator such as ltspice or qucs. however if all you want is to make the curve flatter _somehow_, you might want to focus on r44 and c31.
r44 is sorta-kinda a gain control for the filter, by shorting it the section is just a buffer, and by replacing it with a 250k trimmer you get a good control range over the input peak. it's not a q control though.
c31 does an additional -6dB above 680Hz. it's not much, but opening it up may help a bit if r44 is already low. the corner frequency is 160kHz/(5k*c31[nF]), note that the effective output resistance of a voltage divider is the values of both resistors in parallel.
if you want to create a specific response in a simulator, it might be helpful to insert a resistor in series with c34 to get independent control of gain and q.
hope this helps
the easiest way to get exactly what you want would be to throw it at a circuit simulator such as ltspice or qucs. however if all you want is to make the curve flatter _somehow_, you might want to focus on r44 and c31.
r44 is sorta-kinda a gain control for the filter, by shorting it the section is just a buffer, and by replacing it with a 250k trimmer you get a good control range over the input peak. it's not a q control though.
c31 does an additional -6dB above 680Hz. it's not much, but opening it up may help a bit if r44 is already low. the corner frequency is 160kHz/(5k*c31[nF]), note that the effective output resistance of a voltage divider is the values of both resistors in parallel.
if you want to create a specific response in a simulator, it might be helpful to insert a resistor in series with c34 to get independent control of gain and q.
hope this helps