YORKVILLE Traynor Acoustic Master Mini Mode D'emploi page 5

8. Channel 2 Mic Input
Use this input to plug in a dynamic microphone to amplify a guitar without a pickup or for singing.
9. Clip LED (Ch 2)
See item 2. Same deal.
10. Gain Control (Ch 2)
Like item number 3.
11. Tone Control (Ch 2)
This channel implements a "tilt" style tone control and is flat at 12 o'clock. As you turn up it
increases the treble and simultaneously lowers the bass. As you turn down it drops the treble and
increases the bass.
12. Reverb (Ch 2)
Same as the reverb control on channel 1 (see item 6).
13. Master Volume
Sets the overall volume of your amplifier.
14. Power LED
Turns shiny green when you turn on the amp.
15. Auxiliary Input (back panel)
This input can be used to plug in your phone or an MP3 player for jamming along to your favourite
tracks. The level is controlled by the master volume and the volume you set on your player.
16. DI Out (back panel)
This is a line level version of your signal taken just before the master volume control. It Can be used
for recording with a suitable interface or for sending effected and EQ'd signal to a mixing console.
A Word about Feedback
Feedback in the context of acoustic guitar amplification tends to refer to a low frequency
phenomenon where the sound energy from the amp vibrates the top of the guitar, which in turn
vibrates the strings which then send that same frequency back to the amp. This creates an endless
loop where the sound is "fed back" from the guitar to the amp to the guitar to the amp etc. and it can
interfere with your ability to play the notes you want.
• Here are some important points about feedback in the context of acoustic guitars
• Feedback is MUCH worse when the speaker of your amp is pointed at the top of your guitar.
• Most acoustic guitars have a single frequency at which they tend to feed-back much more
aggressively than at others
• Boosting bass can worsen the feedback phenomenon; inversely, cutting bass can allow you to
play louder before feedback becomes an issue.
In order to enhance the gigging abilities of the Acoustic Master Mini, we have implemented a "Variable
High-Pass Notch Filter" (see image), which is labelled "Anti-Feedback." This control introduces a deep
notch at one frequency and simultaneously reduces the bass below the notch frequency. This can
allow you to play much louder than you might otherwise be able, at the expense of a change in the
bass response of the amplifier. This is especially helpful for gigs or for playing with a band where a
keyboard or bass guitar might be filling in the bottom end.
To use the control most effectively we suggest you follow this procedure
1. Position your amplifier where you intend to use it and position yourself (with your guitar)
where you will be while playing.
2. Turn up your gain and/or master volume until your guitar begins to feed back.
3. Turn up the anti-feedback control until the feedback is suppressed.
4. Begin to turn up your volume again until feedback starts again.
5. Once feedback starts again, turn down your volume just until it stops.
6. You've now set up your amp for the maximum output level for your current playing situation.
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