DBX 1215 12 Series - Dual 15 Band Graphic Equalizer - DBX131SV

Product Overview

The DBX 1215 is a professional dual 15-band graphic equalizer from the 12 Series, offering 2/3-octave frequency control on two independent channels for installed sound systems that require high dynamic range and permanent wiring flexibility. As a rack-mount 15-band EQ with transformer balanced I/O and barrier strip connectors, the DBX 1215 graphic equalizer addresses the needs of commercial AV installations where galvanic isolation, relay bypass, and multi-connector compatibility are required. Available at Creation Networks.

Product Description

The DBX 1215 provides dual-channel 2/3-octave graphic equalization in the 12 Series format, with 15 ISO-centered frequency bands per channel covering the full audio spectrum. Each band operates within a selectable +6 dB or +12 dB boost/cut range, and the 45mm faders provide improved resolution compared to 2 Series units when making subtle corrections in permanently installed systems. A front-panel 18 dB/octave 40Hz Bessel low-cut filter removes sub-bass energy before it reaches downstream amplifier chains. Magnetically isolated transformer balanced inputs and outputs deliver high common-mode rejection and galvanic isolation, protecting against the ground loops that commonly affect installations with long cable runs between distributed equipment locations. The relay bypass engages automatically if the unit loses power, ensuring signal continuity in critical installations. XLR, 1/4 inch TRS, and barrier strip connectors on all inputs and outputs allow the 1215 to be wired directly into conduit infrastructure without adapters. The unit occupies 2U of rack space in a standard 19-inch rack and delivers greater than 118 dB dynamic range with THD+Noise less than 0.003%, consistent with the 12 Series performance standard for commercial-grade signal processing.

Key Features

• Dual 15-Band 2/3-Octave Graphic EQ - Two independent channels with ISO-centered 2/3-octave frequency bands for broadband room correction and system voicing.
• Magnetically Isolated Transformer Balanced I/O - Galvanic isolation and high CMRR protect against ground loops in permanent installations with long cable runs.
• Selectable Boost/Cut Range - Switch between +6 dB and +12 dB per band for fine correction or deeper adjustment as required.
• 45mm Faders - Larger fader travel than 2 Series units improves resolution for subtle room correction adjustments.
• 18 dB/Octave 40Hz Bessel Low-Cut Filter - Removes sub-bass energy to reduce intermodulation distortion in the amplifier chain.
• Relay Bypass - Automatically maintains signal path continuity during power-off events.
• Flexible Connector Options - XLR, 1/4 inch TRS, and barrier strip terminals support permanent installation wiring without adapters.
• Greater Than 118 dB Dynamic Range - 12 Series performance specification appropriate for commercial-grade installed sound signal chains.
• 2U Rack Format - Standard 19-inch rack mounting in a 2U chassis for equipment rack installation.

Typical Applications

• House of worship
• Auditorium
• Multi-purpose room
• All-hands room
• Training room
• Conference room

Technical Specifications

Frequently Asked Questions

What is the advantage of 15-band equalization versus 31-band for installed sound?

A 15-band equalizer with 2/3-octave spacing applies broader adjustments than a 1/3-octave 31-band unit. This makes it better suited for correcting room mode clusters and broad frequency response anomalies without the risk of over-notching narrow bands. Many installed sound system designers prefer 15-band EQ for main system tuning and reserve 31-band units for fine-detail corrections.

Why is transformer balanced I/O important for permanent installations?

Transformer isolation provides galvanic separation between signal source and destination, eliminating ground loops that cause 60 Hz or 120 Hz hum in systems with multiple pieces of equipment connected across different AC circuits. In commercial installations with distributed amplifier racks and stage inputs, transformer balanced I/O is a standard specification requirement.

How does the DBX 1215 differ from the DBX 215s?

The 1215 is from the 12 Series and features transformer balanced I/O, 45mm faders, barrier strip connectors, and a 2U chassis. The 215s is from the 2 Series with electronically balanced I/O, 30mm faders, no barrier strip connectors, and a 2U chassis. The 1215 is typically specified for permanent installed sound where transformer isolation and conduit-compatible wiring are required.

Does the DBX 1215 have a front-panel EQ bypass switch?

Yes. The 1215 includes a front-panel EQ bypass switch that routes the signal directly through the unit without passing through the equalizer section. The relay bypass remains active for power-fail protection regardless of the bypass switch position.

What rack space does the DBX 1215 require?

The DBX 1215 occupies 2U (3.5 inches) of space in a standard 19-inch equipment rack.

Can the barrier strip connectors on the 1215 accommodate standard contractor wiring?

Yes. The barrier strip terminals accept standard stripped wire conductors commonly used in commercial AV and sound contracting installations. This eliminates the need for XLR or TRS connectors on permanent wiring runs, reducing installation time and improving reliability in conduit systems.