EQU231VU-MKII V2 - Processor ALTO - Free user manual and instructions
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| Product Type | 31-Band Graphic Equalizer |
| Model | EQU231VU-MKII V2 |
| Brand | Alto |
| Frequency Bands | 31 ISO 1/3-octave bands from 20Hz to 20kHz |
| Controls | 31 sliders, EQ bypass switch, low-cut filter, output level control, RTA microphone input |
| Input/Output | Balanced XLR and 1/4" TRS, unbalanced RCA |
| Input Impedance | 10k ohms balanced, 20k ohms unbalanced |
| Output Impedance | 100 ohms balanced, 50 ohms unbalanced |
| Maximum Input Level | +21dBu balanced, +15dBu unbalanced |
| Maximum Output Level | +21dBu balanced, +15dBu unbalanced |
| Frequency Response | 20Hz - 20kHz (+/- 0.5dB) |
| Signal-to-Noise Ratio | > 100dB (unweighted) |
| Total Harmonic Distortion | < 0.005% (1kHz, +4dBu) |
| Power Supply | AC 100-240V, 50/60Hz, internal switching |
| Power Consumption | 15W typical |
| Dimensions (W x D x H) | 19" x 8.5" x 1.75" (483 x 216 x 44 mm) - 1U rack |
| Weight | 2.73 kg (6 lbs) |
| Rack Mountable | Yes, 1U, with included rack ears |
| Low Cut Filter | 40Hz or 80Hz, 12dB/octave |
| Bypass Mode | Hardwire bypass via footswitch or front panel switch |
| RTA Microphone | Included for real-time analysis |
| Cleaning | Use a dry, lint-free cloth. Do not use solvents. |
| Safety | Use only with grounded AC outlets. Do not expose to rain or moisture. |
| Spare Parts & Repairability | Contact Alto customer service for authorized service centers. No user-serviceable parts inside. |
Frequently Asked Questions - EQU231VU-MKII V2 ALTO
How do I connect the EQU231VU-MKII V2 to my audio system?
Use balanced XLR or 1/4" TRS cables for optimal sound quality. Connect the output of your source (e.g., mixer) to the Input jacks, and the Output jacks to your amplifier or next processor. Ensure all devices are powered off during connection.
What is the purpose of the RTA microphone and how do I use the equalizer for room correction?
The included RTA microphone connects to the RTA Mic Input on the rear panel. Place the mic at the listening position, engage the RTA function, and adjust the EQ sliders until the frequency response is flat on the RTA display. This helps compensate for room acoustics.
Can I bypass the EQ quickly during a live performance?
Yes, press the EQ Bypass switch on the front panel or connect an optional footswitch to the rear panel Footswitch jack. The bypass is a hardwire relay, so signal passes even without power.
What is the low-cut filter used for?
The low-cut filter (also called high-pass filter) removes low-frequency rumble or stage noise. You can select 40Hz or 80Hz with a 12dB/octave slope. Engage it via the front panel switch to clean up subsonic frequencies.
The unit has no power. What should I check?
First, verify the power cord is securely connected to both the unit and a working AC outlet. Check that the mains voltage selector is set to your local voltage (switch inside the IEC inlet cover). Ensure the power switch on the front panel is on. If still no power, consult a qualified technician.
How do I clean the front panel and sliders?
Use a dry, lint-free cloth to gently wipe the surface. For sliders, avoid using spray cleaners directly. If needed, lightly dampen the cloth with water. Do not use alcohol, ammonia, or abrasive cleaners.
What is the maximum input level before distortion?
The maximum input level is +21dBu balanced and +15dBu unbalanced. Exceeding these levels may cause clipping. If you see the Clip LED on the front panel, reduce the input signal using the level control or your source.
Can I use this equalizer in a stereo rig?
The EQU231VU-MKII V2 is a mono unit. For stereo operation, you need two units (or use one for a summed mono feed). However, you can use the left and right channels as separate mono paths if you route them appropriately.
How do I set the output level correctly?
Turn the Output Level knob fully clockwise for unity gain (0dB). Adjust this knob to match the level of other equipment. Typically, set it so the average output level is around +4dBu. Avoid excessive boost to prevent noise.
What is the warranty on this product and where can I get service?
Alto offers a 1-year limited warranty from the date of purchase. For service, contact your local Alto distributor or submit a request through the Alto website. Do not attempt to open the unit as there are no user-serviceable parts inside.
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