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Thank you for your purchase. We have developed a quality DI with preamp for use by professional musicians
with added features for home or private practice.
Features: The Ai1 is a quality DI and full‐featured preamp with active tone controls. Whether at a local open
mic night or at a major concert venue, you will be able to dial in your clear natural acoustic sound and route it
through a balanced XLR output or unbalanced standard line output to the PA sound system. Not on stage? No
problem, you can also use the Ai1 to connect your acoustic instrument into your home theater system or just
plug in a pair of headphones for private listening.
Power Requirements: 9VDC
This unit can run off 9V battery or you can connect a 9V adapter.
• Battery: Standard 9V battery (Power consumption approx. 30 mA)
• Power Supply: 9V DC (Regulated) , 50 mA minimum
Attention Power Supply Users:
• Use a "DC" Power Supply Only! Failure to do so may damage the unit and void the warranty.
• The adapter must have a 2.1mm barrel connector with center negative. The battery may be left in or
taken out when using an adapter.
Attention Battery Users:
• To install or replace the 9V battery, simply open the easy access battery door located on the bottom of
the unit.
• Always remember to unplug your guitar cords from the Ai1 to conserve battery life.
Initial Setup
Begin with all of the knob controls at the mid point (12:00 o'clock) with the "SHAPE" switch "OFF" and the
"Ground (GND) LIFT" switch "OFF". The "PHASE" switch can be in either the "IN" or "OUT" position.
This initial setup will provide a medium gain setting with FLAT frequency response.
Each control is fully explained in the next section.
Ai1 OWNER'S MANUAL
Getting Started:
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Summary of Contents for GMF Ai1
- Page 1 Thank you for your purchase. We have developed a quality DI with preamp for use by professional musicians with added features for home or private practice. Features: The Ai1 is a quality DI and full‐featured preamp with active tone controls. Whether at a local open mic night or at a major concert venue, you will be able to dial in your clear natural acoustic sound and route it through a balanced XLR output or unbalanced standard line output to the PA sound system. Not on stage? No problem, you can also use the Ai1 to connect your acoustic instrument into your home theater system or just plug in a pair of headphones for private listening. Getting Started: Power Requirements: 9VDC This unit can run off 9V battery or you can connect a 9V adapter. • Battery: Standard 9V battery (Power consumption approx. 30 mA) • Power Supply: 9V DC (Regulated) , 50 mA minimum Attention Power Supply Users: • Use a “DC” Power Supply Only! Failure to do so may damage the unit and void the warranty. • The adapter must have a 2.1mm barrel connector with center negative. The battery may be left in or taken out when using an adapter. Attention Battery Users: • To install or replace the 9V battery, simply open the easy access battery door located on the bottom of the unit. • Always remember to unplug your guitar cords from the Ai1 to conserve battery life. Initial Setup Begin with all of the knob controls at the mid point (12:00 o'clock) with the "SHAPE" switch "OFF" and the “Ground (GND) LIFT” switch “OFF”. The “PHASE” switch can be in either the “IN” or “OUT” position. This initial setup will provide a medium gain setting with FLAT frequency response. Each control is fully explained in the next section. ...
- Page 2 Control Elements Panel 1. POWER: The green LED illuminates when the Ai1 is activated. The Ai1 will become active when a plug is inserted into the INPUT jack. 2. INPUT GAIN is the first control you should adjust. It is not a volume control. The "INPUT GAIN" sets the level of amplification applied to the input signal to boost it to a useable level. This adjustment allows for a wide range of pickup devices. You will want to use the highest "INPUT GAIN" setting you can without overdriving or distorting the signal. If you are using a high output active pickup system you will likely want to use a lower setting on the "INPUT GAIN". If you are using a passive type pickup system you will likely need a higher setting on the "INPUT GAIN". To adjust, slowly turn the "INPUT GAIN" up (clockwise) while playing your instrument until you begin to hear some distortion, then back the "INPUT GAIN" down (counter‐clockwise) until the distortion disappears. This will give the Ai1 the most signal to work with and the best signal to noise ratio. Take note of this optimized setting for future reference. 3. LEVEL adjusts the amount of signal sent to ALL Outputs (D.I. XLR OUT, Standard OUTPUT, HEADPHONE jacks and RCA LINE OUT). 4. BASS adjusts the amount of cut or boost in the low frequency (150HZ) range. 5. TREBLE adjusts the amount of cut or boost in the high frequency (5kHZ) range. 6. SHAPE ON/OFF switch enables or disables the “SHAPE” control. In the “ON” position, mid frequencies will be cut and the high and low frequencies will be boosted. 7. PHASE affects the way the signal mixes live and when recording. If you experience “positive acoustic” feedback, flip the phase switch to the alternate setting to kill the feedback. 8. GND LIFT If you have multiple grounds, you may have hum or ground loops. Disconnect the DI output ground by switching “ON” the Ground Lift to eliminate this problem. ...
- Page 3 Primary Input Output Panel: INSTRUMENT INPUT: uses a standard instrument cable and is designed for all passive and active type pickup signals. When a plug is inserted, the 9V battery is switched on. Be sure to unplug from the INSTRUMENT INPUT when the Ai1 is not in use to conserve the battery life. We recommend you turn down your amp or mixers input before plugging/unplugging from the INPUT jack to help protect your speakers from loud pops. PHONES: Use a standard 1/8” stereo jack for connection of headphones. D.I. OUT: Plug a standard XLR cable from your PA or recording console into this low impedance balanced output. OUTPUT: Plug a standard instrument cable from a stage monitor, amp, or mixer into this unbalanced output. Use the “LEVEL" control to set all Ai1 output levels to best match your sound system and give you the least amount of noise. ...
- Page 4 LINE IN: (Stereo) is an input for a CD/Tape player, MP3 player or other equipment with RCA type connectors. The RCA line input will be heard through all Ai1 outputs. Volume level of inputs connected through the “RCA LINE IN” must be controlled at the source. The “LEVEL” control does not affect the “RCA LINE IN” volume. LINE OUT: (Stereo) can be used to patch your acoustic instrument into any other equipment that uses RCA type inputs, like your home theater system. ...
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Page 5: Block Diagram
Specifications: Input: Connector: Standard ¼” TS Jack Impedance 1M ohm Output: Connector Standard ¼” TS Jack Impedance 510 ohm DI OUT: Connector XLR Balanced Impedance 100 ohm Headphone: Connector 1/8” TRS Stereo Jack Impedance 5.1 ohm Line In: (Stereo) Connector: ...