Oct 31, 2003 12:00 PM, Editors


Education Guide

Mix is gearing up to present its longstanding annual Audio Education Guide in its November 2014 issue. Want to have your school listed in the directory, or do you need to update your current directory listing? Add an image, program description, or a logo to your listing! Get your school in the Mix Education Guide 2014.

Bag End’s new generation of bass signal processors, called INFRA, comprise the INFRA-M (shown) and INFRA-M2, which rely on technology that operates a subwoofer below resonance without the use of lowpass filters, eliminating delay, impedance bumps and other irregularities.

In the INFRA technology, the electrical signal goes through the INFRA electronics before the power amplifier, as it would with a conventional electronic crossover. Inside the INFRA electronics, a slope is applied to the signal by the use of dual integrators lifting the low frequencies by 12 dB per octave.

The INFRA loudspeaker is placed in a small enclosure, providing a relatively high system resonance for a subwoofer. The system's response without the INFRA electronic drive will rise at 12 dB per octave up to its resonance frequency and then flatten out until the woofer reaches its upper limit. When INFRA drive is applied, the 12dB per octave roll-off of the cabinet combines with the 12dB per octave lift of the electronics to form a flat frequency response down to the lowest point set on the INFRA electronics—as low at 8 Hz. Above resonance, the loudspeaker would normally respond flat up into the midrange. With INFRA drive, the dual integrators roll-off at 12 dB per octave from the system resonance, or the point where the speaker would normally run out flat.

Because there are no lowpass filters in INFRA technology, there is no filter delay. Below resonance, the impedance, cone excursion and dampening factor are uniform and predictable. Thus, the reaction time, controllability and the ultimate fidelity of the loudspeaker is dramatically improved. The spatial offset between the INFRA system and the upper-range loudspeakers is minimized.

Suggested retail price for the INFRA-M processor is $1,180; SRP for the INFRA-M2 is $1,390.

In other company news, Bag End introduced pro versions of its INFRAsub-18 and INFRAsub-12 powered subwoofers, which offer new control abilities for professional studio surround monitoring applications.

Among new features, the pro models contain an input card offering six inputs and five highpass filter outputs. In addition, an INFRA slave output is calibrated to the internal amplifier for additional speaker modules. A remote threshold indicator allows the dynamic filter to be monitored remotely from the console bridge. Polarity and 10dB attenuator switches allow for fine-tuning adjustments and integration to the upper-range speaker systems.

Otherwise the INFRAsub-18 PRO and INFRAsub-12 PRO are nearly identical to the company’s home-theater versions. They are both powered by an internal 400-watt amplifier and controlled by Bag End’s exclusive dual integrator, which is also internal. The INFRA processor gives the INFRAsub12 PRO the same ability as its bigger brother to produce a flat acoustical response down to 8 Hz.

The INFRAsub-18 PRO contains an 18-inch woofer and measures 23.5x21.5x18.5 inches (HxWxD) and weights 91 pounds. The INFRAsub-12 is loaded with a 12-inch woofer that measures only 15.5x18x15.5inches (HxWxD and weighs 57 pounds.

Specifications for the INFRAsub-12 PRO and INFRAsub-18 PRO include: Transducer offers a 12-inch extended low cone; inputs are six XLR connectors; outputs include five highpass XLR; frequency response is +/-3 dB, 8 Hz to 95 Hz; and amplifier output is 400 watts continuous sine wave.

SRPs include: INFRAsub-12 PRO, $1,980; and INFRAsub-18 PRO, $2,060.

For more, visit For more new product announcements, visit

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