The Lone Wolf Harp Tone+ is the answer for those who want a bassier tone, a fat bottom, more depth, for those who want to keep their vintage amp original and unmodded, those who are tired of trying all of the different combinations of tube brands and types and those who are tired of chasing that silver bullet mod that promises to make their amp a great harp amp. The Harp Tone+ really stands out with tongue blockers, chording and train rhythms, higher keyed harps suddenly have depth you have never heard before.
The Harp Tone+ is designed to make any amp a good harp amp by addressing the shortcomings of the guitar amplifier itself, the coupling caps, the excessive preamp gain and speakers that do not have a good bass response. The pedal is essentially a 2-band equalizer with a range of 20db in gain to a reduction of 20db in level for both bass and treble frequencies. With the controls in the position shown below your tone and level are unchanged and from this point you can increase or decrease your bass and treble frequencies as well as lower your volume to control feedback or increase your volume if you want a little gain for solo's. The Harp Tone+ does not eliminate feedback but it does help control it and it has a true bypass.
Why 20db in gain? The 20db in gain for bass frequencies is necessary because they are so low in comparison to the mids and the highs that are produced in harps, they are there but they are at a very low level. This pedal is ideal for increasing bass frequencies in you tone, it is ideal for amps with no tone control, increasing volume for solo's, for decreasing feedback and for giving the harp player more control over his tone when playing into a PA.
The Harp Tone+ makes any guitar amp a good harp amp. How? By providing the gain necessary to drive bass frequencies through the low value coupling capacitors for one; and if feedback is a problem and the amp starts to feedback too early due to the excessive preamp gain found in all guitar amps then by lowering the volume on the Tone+ you can counter that excessive gain and now turn the amps volume up to a much higher level where the volume control setting will not be as critical in relation to feedback. Plus, if you have a speaker that is poor on bass response you will now be able to push it harder with higher-level bass frequencies and bring it to life.
How does the Harp Tone+ make any mic a better mic? The ultra high input impedance, the gain available in the bass frequency range and the volume control that helps control feedback or add volume whichever your needs are.
Set the volume on your amp to around 8 and then turn back (ccw) the volume control on the Tone+ until feedback stops; then, set the bass and treble to your preferance and fine tune your volume with the volume control on your amp. This method will supress feedback and allow you to get more volume from your current amp.
To make it all just a little easier Lone Wolf is offering a power supply for US and EURO customers to power your Harp Tone+. The ac adapter requirements are 9V DC with a minimum 200mA output and a 2.1mm x 5.5mm connector with a negative center and the outer positive.