Whirlwind IMP 2 (IM2)
What it is
The IMP 2 is a passive direct box with a 1/4 inch parallel input and output, an XLR output, a ground lift switch, and Whirlwind's TRHL transformer. The manufacturer lists it as a 133:1 impedance ratio unit with a flat 20 Hz to 20 kHz response within 1 dB and a -20 dB level change from input to output. Because it is passive, it needs no battery or phantom power. The box is generally described as a budget-range, standard DI. Reviewers and retailers present it as a simple, easy-to-set-up unit, and its most commonly cited purpose is reducing ground-loop hum and noise between an instrument and a sound system or recording input. Its build is described as rugged and portable. The IMP 2 is sold under several names, including IMP2, IMP 2 Standard Direct Box, and IM2. The sources I read describe no other revisions of this unit, and the manufacturer's spec sheet and manual could not be read for this entry.
Specifications
- Model
- IM2
- Type
- Single-channel passive direct box
- Impedance ratio (input to output)
- 133:1
- Frequency response
- 20 Hz to 20 kHz, plus or minus 1 dB
- Level change (input to output)
- -20 dB
- Inputs
- 1/4 inch parallel in (wired through)
- Outputs
- 1/4 inch parallel out; XLR output
- Ground lift
- Yes (switch)
- Transformer
- Whirlwind TRHL
- Power
- None required (passive)
How it's used
Sources describe it as a stage DI. The 1/4 inch parallel output feeds an amplifier while the XLR output feeds a mixing console. It is also described as used in recording and mixing to bring an instrument-level signal into a mic-level input. Reviewers list acoustic and bass guitars as typical sources and say it works with other instrument-level or line-level sources. Its most cited use is ground-loop hum and noise reduction.
Suggested usage
Ground lift setting
One reviewer advises keeping the ground lift in the lifted position as much as possible and switching to grounded only when the source needs a ground, such as some passive guitars. This is one reviewer's advice rather than a manufacturer instruction, so check the manual before relying on it.
Line-level splitting
One reviewer notes the box can be used as a splitter for line-level signals.
Setup
Because the unit is passive, there is no power supply to manage and it is ready to use once connected.
What reviewers said
- Home Studio Expert
A 2019 review that calls the IMP 2 a simple, easy-to-set-up passive DI with a rugged, portable build and good value in the budget range. It says the box suits live work and recording from instrument-level sources and acknowledges that better DI boxes exist. The article contains affiliate links.