LR4 - Uncategorized LEXICON - Free user manual and instructions
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| Product Type | Signal Processor / Effects Unit |
| Brand | Lexicon |
| Model | LR4 |
| Dimensions (W x D x H) | 19 x 7.5 x 1.75 inches (rack unit) |
| Weight | 5.5 lbs (2.5 kg) |
| Power Supply | AC 100-240V, 50/60Hz, 15W |
| Audio Inputs | 2 x XLR balanced, 2 x TRS balanced/unbalanced |
| Audio Outputs | 2 x XLR balanced, 2 x TRS balanced |
| Sample Rate | 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz |
| Bit Depth | 24-bit |
| Frequency Response | 20 Hz - 20 kHz (±0.5 dB) |
| Dynamic Range | > 110 dB (A-weighted) |
| THD+N | < 0.002% (1 kHz, -1 dBFS) |
| Effects Types | Reverb, delay, chorus, flange, phaser, pitch shift |
| Presets | 200 factory presets, 100 user presets |
| Connectivity | MIDI In/Out, USB (for firmware updates) |
| Control | Front panel knobs, buttons, and LCD display |
| Mounting | 19-inch rack mount, 1U |
| Operating Temperature | 5°C to 40°C |
| Construction | Steel chassis with aluminum front panel |
| Accessories Included | Power cord, user manual, rack ears |
| Warranty | 1 year limited |
Frequently Asked Questions - LR4 LEXICON
How do I reset the LR4 to factory defaults?
Hold down the Preset button while powering on the unit until the display shows 'Factory Reset'. Confirm by pressing the Enter button.
Can I use the LR4 with a guitar?
Yes, but you may need a DI box to match impedance. The LR4 expects line-level signals, so a preamp or direct box is recommended for passive pickups.
What is the maximum input level?
The maximum input level is +22 dBu for the XLR inputs and +18 dBu for the TRS inputs. Exceeding these may cause clipping.
How do I update the firmware?
Connect the LR4 to your computer via USB, download the latest firmware from Lexicon's website, and run the updater utility. Ensure the unit stays powered during the process.
The display is dim. How can I adjust brightness?
Press and hold the Utility button for 3 seconds, then use the Value knob to adjust brightness from 1 (low) to 10 (high). Press Enter to save.
Can I chain multiple effects at once?
Yes, the LR4 allows up to 4 simultaneous effects in a series. Use the Effect select buttons to assign each slot.
What is the latency of the unit?
Latency is typically below 2 ms at a sample rate of 96 kHz, making it suitable for live monitoring.
How do I clean the LR4?
Use a soft, dry cloth to wipe the front panel. Avoid liquid cleaners. For connectors, use compressed air. Do not open the unit.
Is the LR4 compatible with 19-inch rack rails?
Yes, it is designed for standard 19-inch racks. Rack ears are included, and the depth is 7.5 inches.
What do I do if there is no sound output?
Check that the input cables are properly connected, the unit is powered, the output volume is not at zero, and the input signal is present. Also verify that no mute or bypass is active.
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USER MANUAL LR4 LEXICON
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Product information
Brand : LEXICON
Model : LR4
Category : Uncategorized