RMI Basswitch IQ DI
Order code 5000
App-1.png App-2.png
01-Gold-RS.jpg Gold-plated Relays & Switches
The signal from the pickups of an electric guitar or bass is so weak that poor-quality cables, cold joints and cheap contact materials ruin your sound. Switch contacts need to be made of special materials to permit loss-free switching of these low-level signals. All Lehle switchers feature special relays and slide switches with gold-plated contacts for totally reliable, absolutely zero-loss switching.
02-4-band-EQ-double-parametric-mids.jpg 4-band EQ with double semi-parametric mids
An EQ is primarily intended to raise particularly desirable frequencies in a sound spectrum as well as filtering out the undesired ones. By semi-parametric filtering, and the division in HM for high and LM for low mids, a very individual and precise adjustment of the sound is possible.
The T-knob, a so-called shelving filter, controls the heights, the B-controller is responsible for the basses. The center frequency is selected with HF and LF and with HM and LM you can determine the intensity. Thus these frequencies can be raised or lowered in a bell-shaped curve.
03-18V.jpg Voltage Internally Doubled to 18V
To exploit the dynamics of tube amplifiers to the full, the input voltage of Lehle products bearing this symbol is rectified from the power supply socket, then filtered, stabilized and doubled to 18V.
05-Gain.jpg Adjustable Gain
Adjustment of volume or distortion using a gain controller is a vital feature in many situations. The gain controllers on the corresponding Lehle products feature black anodized aluminium knobs set back into the housing so that they can be easily fingertip rotated but keep their settings during performances and transportation.
08-LTMZ.jpg Lehle LTMZ Transfomer
The Lehle LTMZ transformer allows the galvanic isolation at the DI output. Only real physical galvanic isolation guarantees complete elimination of ground hum and annoying background noises in any live or studio situation. The Lehle LTMZ transformer also offers a high level of safety as it isolates from voltage peaks of up to 2000V - without loosing any tone!
09-XLR.jpg XLR Output
Equipped with a standard male XLR-socket with gold plated contacts for balanced output.
The concept for this "swiss army knife for bassplayers" comes from Jacques Ruppert, head of RMI, while the technical part was realized here at Lehle. As a central controller for bass setups it is equipped with a number or features:
  • Lehle True Sound Technology
  • Input A/B switch with impedance matching for piezo pickups
  • Studiograde preamp
  • 4-band EQ with double semiparametric mids
  • switchable effectsloop with blend/mix control
  • switchable effectsloop can also be used as volume boost
  • serial effectsloop (non switchable)
  • Studiograde D.I.-box with Pad-, Pre/Post- und groundlift-switch incl Lehle LTMZ transformer for galvanic isolation
  • can be used with any power supply 9 to 20 volt AC oder DC
  • additonal output for tuner
  • muteswitch
  • extremly robust design with protected controls
The Basswitch IQ DI is manufactured by Lehle in Germany on behalf of RMI.
Q: Can I use a piezo pick-up with the Basswitch IQ DI bass preamp?
A: Yes you can, thanks to its variable input impedance. The Basswitch IQ DI has an input impedance switch on Channel A making it equally suitable for a magnetic and piezo pick-ups.

Q: What kind of power supply should I use for with my Basswitch IQ DI bass preamp?
A: The Basswitch IQ DI accepts all power supplies providing not less than 9V, not more than 20V and at least 130 mA. Either alternating (AC) or direct current (DC) sources can be used and the polarity is not relevant.

Q: What does the Mix Control of the Basswitch IQ DI bass preamp do?
A: Many effect pedals do not let you mix the basic sound of your instrument and the effect sound. At the same time many effect pedals destroy the powerful bass component in the signal and the result is an unattractive, thin sound. The Mix Control allows you to adjust the effects-ratio added to the original sound, settings from 0% (dry) to 100% (wet) are possible.

Q: Can the Basswitch IQ DI drive a power amp?
A: Yes the Basswitch IQ DI can drive a power amp directly. The preamp can boost the signal up to +15 dB.

Q: Can the Basswitch IQ DI be used to switch between 2 totally different instruments?
A: Yes Channel A of the Basswitch IQ DI features a cut and boost level control for volume adjustment between the two inputs.

Q: What is Lehle True Sound Technology?
A: Lehle True Sound Technology is based on individual measures that follow one common goal: transporting the sound and character of the instrument in the best way possible, without any negative alteration. It achieves an open and dynamic sound without losing any detail. The buffers are designed to easily transmit within the megaherz-range. The Lehle True Sound technology uses either goldplated relais or goldplated switches, even the smallest currents will be transported without any degradation for many years to come.