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18    

AC power inlet. 

Always operate the unit at the mains voltage the voltage selector is set to

 (115VAC or 220-240VAC). Failure to do 

so may cause a costly damage to the unit. If that inadvertently happens, immediately pull out the AC plug. 

 

19

     Voltage selector. For travelling musicians. Set it according to the local operating mains voltage. If you forget to, and operate a unit set to 

115VAC on 220 to 240V, you may easily burn the power transformer. The fuse probably won’t be quick enough to save it. So please pay 
attention. 

 

20

    (Mk II only). Unbalanced line output. 

 

 
TECHNICAL SPECIFICATIONS: 

 
1 channel 

Frequency response:  10Hz-50kHz +/- 3dB 
Maximum gain: 54dB at the line output, 32dB at the DI (mic level) output 
Harmonic distortion: <2% before clipping level, quickly decreases if driven less. 

Maximum output level: 30dBu 
Minimum output load: 600Ω 

Connectors: XLR DI and line output, balanced only 
Instrument input: 1/4” unbalanced, mono 
Amp (Thru): ¼” unbalanced, mono, buffered 

Unbalanced out: ¼” mono 
Aux in: 1/8” (3.5mm) stereo jack. 
Headphones out: 1/8” (3.5mm) stereo jack. 

Headphones minimum impedance for +/-10.5V output swing:   150Ω 
Power consumption: 15W 

Operating voltage: 110-120VAC or 220-240VAC, switchable 

 
 
WARRANTY INFORMATION 

 
Sonic Farm gives a one-year warranty on parts and labor from the date of purchase. 

Should you need to send in your unit for warranty covered service, please contact us for an RMA number first. 
We will also tell you where to send the unit. 
Any Modification of the unit voids the warranty. 

 
 

 
 

Summary of Contents for 2di4

Page 1: ...Sonic Farm Pro Audio Vancouver BC Canada Tel 310 402 2390 778 863 1613 www sonicfarm com proaudio sonicfarm com Sonic Farm 2di4 2di4 Mk II Pentode Direct Injection Box USER MANUAL ...

Page 2: ...itar or bass amp 2 2M An EF86 pentode operating in class A is 2di4 s only active gain stage It works in either triode or pentode mode Bypassing cathode increases the gain Frequency dependent bypass using inductors and capacitors yields a subtle but very musical tone control This circuit exhibits a certain non linearity coloration the harmonic distortion may exceed 1 before the actual clipping occu...

Page 3: ...ed with it can take any liability for damage to persons or property caused by either use modification or servicing this unit HOW TO CHANGE TUBES This only applies to a functional unit Please entrust any repairs to qualified service personnel Only an EF 86 or equivalent like 6267 6CF8 or Russian 6J32P pentode can be used Pull out the power cord Wait for at least 10 minutes for all the capacitors to...

Page 4: ...e solution is either to lift the ground off of your amp by using a ground adapter only AFTER you have connected it to the 2di4 with ground switch set to Ground ON and plugged into a grounded 3 prong outlet or by using a signal cable that has the shield disconnected from one of the jacks in which case you LEAVE the amp grounded The idea is to have the amp grounded at ONLY one point either through i...

Page 5: ... how hard the output buffer transformer and ultimately the load are driven The 2di4 may drive your next unit Compressor EQ Converter Mixer into clipping even though the red light doesn t indicate any distortion In that case reduce the output level Its always better to start with lower output level and then increase it as much as your audio chain allows as distortion can occur at more than one poin...

Page 6: ...ection about the amp output on how to eliminate hum buzz from your amp caused by a ground loop when connected to the 2di4 15 Power Switch 16 Line level balanced output electronically balanced XLR pin connection 1 GND 2 HOT 3 COLD Useful for recording or driving a power amp IMPORTANT If you want to drive an unbalanced input you need to make a special XLR to cable Connect XLR s pin 1 to plug ground ...

Page 7: ...ain 54dB at the line output 32dB at the DI mic level output Harmonic distortion 2 before clipping level quickly decreases if driven less Maximum output level 30dBu Minimum output load 600Ω Connectors XLR DI and line output balanced only Instrument input 1 4 unbalanced mono Amp Thru unbalanced mono buffered Unbalanced out mono Aux in 1 8 3 5mm stereo jack Headphones out 1 8 3 5mm stereo jack Headph...

Page 8: ...CONTACT INFORMATION Sonic Farm Pro Audio Vancouver BC Canada Tel 310 402 2390 778 863 1613 www sonicfarm com proaudio sonicfarm com ...

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