ML-117 Modular Mastering Parametric/Shelf Equalizer

€ 6,300

The Monster EQ ML-117 is an advanced Modular 2-channel equalizer to meet the versatility demands of professional recording and mastering engineers. Special analog design techniques has been used to obtain a precise control of the sound structure down to the minimum details.

The Monster EQ ML-117 is an advanced 2-channel equalizer to meet the versatility demands of professional recording and mastering engineers.

The ML-117 features HI and LO cut filters and a 5 band parametric equalizer section including high & low shelving filters. This advanced set of tools for the manipulation of the frequency spectrum allow for unique filtering designs so for a perfect tuning of the structure of the sound down to the smallest detail. The ML-117 is based on Livio Agentini’ s patented single-stage parallel filters. This innovative phase coherent EQ design offers the lowest distortion/noise specifications, not available on similar units on the market.

The equalizer architecture provides a -6dB/+6dB rotary switch controlling the input level, a 50 KHz HI-cut filter and a LO-cut filter with 6 selectable cut-off frequencies.

The filtering section offers low and high shelving filters with 3 different shelving slopes selected by a switch. The gain is controlled in the -10dB/+10dB by pots. A special button labeled “Range” halves the pot’s dB intervention range, increasing its resolution for super fine-tuning of the filter parameters. When this button is pressed, the pot’s entire 270° rotation is spread on a -5dB/+5dB range (rather than the default -10dB/+10dB range).

The Monster EQ provides 5 single-stage fully parametric bands. Each band has a Q control and a switchable CUT/OFF/BOOST function that allows the use of the full knob rotation for the Emphasis/De-Emphasis control in the 0/10 dB range. In the parametric section the “Range” button is used for finer adjustments of the gain spreading the 0/+5 dB range on the full 270° potentiometer rotation angle. The F x 2 switches are used to multiply by 2 the frequency bands.

The Monster EQ is an innovative and uniquely flexible design equalizer, ready to take its place in any high profile recording or mastering

Power Supply Linear Regulator (Balanced C-Core Transformer)
Operating Voltage 220V 50 Hz/ 110 V 60 Hz switchable
Power Consumption 30 W
Input Electronically balanced, Impedance > 10 KΩ
Channel Gain Range:-6 to +6 dB.
Output Electronically balanced,
Output Impedance 50 Ω. (minimum external load 600Ω).
Output Level Level +4dBu, Max +29dBu.
Bandwidth 5 - 200.000 Hz -1dB, perfect square wave up to 20 KHz
Distortion + Noise <0.005% ( typical 0.001 %).
Input Section LO-Cut with 6 selectable cut-off frequencies (10, 15, 20, 25, 30, 40 Hz),12 dB/Oct slope
HI-Cut 50 KHz 12 dB/Oct slope,
Parametric Section 5 bands fully parametric with 5 or 10 dB Boost-Cut,
MID1 Frequency Range: 100-1000 Hz,
Frequency bands: 20-120 Hz, 80-480 Hz, 300-1600 Hz, 1-6 KHz, 4-24 KHz,
All the filters are bell shaped.
Shelf Section LO and HI shelving filters with 3 different shelving shapes selectable by a switch,
Gain Control by potentiometer in the -10/+10 dB range,
Range button to spread the full 270 degrees potentiometer rotation angle on the -5/+5 dB gain range,
Front Panel Controls: Input Section Level pot +6/-6 dB with center detect,
Phase Reverse button with LED,
LO-Cut/HI-Cut select buttons,
6 step LO-Cut cut-off frequency rotary switch(10-40 Hz),
Front Panel Controls: Parametric Section Parametric on/off button:
±5dB Range button.
5 x frequency control pots (20-120 Hz, 80-480 Hz, 300-1600 Hz, 1-6 KHz, 4-24 KHz).
5 x Q control pots
5 x Gain pots (0/+10 dB).
5 x toggle switches (Boost, Off, Cut). (relay commutation).
5 x Freq x 2 mode button.
Parametric Section ON button.
Front Panel Controls: Shelf Section 2 x -10/+10 dB gain pots (HI-Pass/LO-Pass).
2 x toggle switches (shelf slope selection).
0 - 5dB Range button.
Shelf Filter ON button.
Front Panel Indicators: Input Section 2 x red LEDs (Phase, Parametric Off),
2 x green LEDs (Lo-Cut, Hi-Cut).
Front Panel Indicators: Parametric Section (per channel) 5 x three way illuminated toggle switches (green/Boost, none/Off, red/Cut)
1x green LED (Freq. X2).
1x blue LED (Range).
Front Panel Indicators: Shelf Section (per channel) 1 x blue LED (Range),
1 x green LED (Shelf On).
Rear Panel Controls 2 x Bal/Unbal switch.
Rear Panel Line In Connectors 2 x Balanced XLR female.
Rear Panel Line- Output Connectors 2 x Balanced XLR male.
Main Switch Power On/Off switch
Rear Panel AC mains IEC C13 16 A connector, AC mains cord with IEC Schuko 16A.
Construction 19" rack mount metal box
Dimensions W 483 mm / 19”, H 133.5 mm/5.25” (3 RU), D 225 mm / 8.86”.
Weight 8 kg.

    ML-117 Key-Technologies


    Modular means that the unit can be custom configured by choosing the right module from a set of standard modules or by choosing custom designed modules suitable for specific applications.

    Large Bandwidth (LB) means a very fast transient response able to represent the original sound with the maximum temporal resolution. LB is required to improve the perception of a “real sound” and to represent the details of the original sound.

    Large bandwidth plus very low total harmonic distortion means a perfect square wave reproduction.

    Ultra Low Noise (ULN) active and passive components and ULN design techniques. This requirement is especially important when the audio bandwidth is large as in the case of ARREL Audio products.

    Very High Dynamic Range (VHDR) means that the saturation probability of the output stages is extremely low. This is obtained by using special rail to rail circuits and by increasing the power supply voltage of the analog circuits.

    Electromechanical tolerance means that electromechanical components are doubled in every situation in which maximum reliability it is important due to a frequent use (switches, push buttons, potentiometers).

    Through Hole technology means the maximum reliability in terms of thermal and mechanical stresses especially for connectors and electromechanical components.

    Special patented circuits guarantees very low phase distortion in ARREL equalizers and filters.