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Inter-M GEQ-2231 Digital Graphic Equalizer - ProSoundNetwork.com

Inter-M GEQ-2231 Digital Graphic Equalizer

I was not very familiar with Inter-M, when this package arrived. Upon further investigation, I discovered it is a South Korean company that has been in the audio business for more than 25 years. It has kept a low profile as an OEM for better known labels.
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I was not very familiar with Inter-M, when this package arrived. Upon further investigation, I discovered it is a South Korean company that has been in the audio business for more than 25 years. It has kept a low profile as an OEM for better known labels. But over the last couple of years they have been building products under their own name From my experience with the GEQ-2231 I expect I'll become more familiar with Inter-M.
Product PointsApplications: Installation, live sound

Key Features: Two-channel; onboard high-pass and low-pass filters; limiter; 60mm sliders; "cut-only" mode

Price: $868

Contact: Contact: InterM Americas at 610-874-8870, Web Site.
Features

The Inter-M GEQ-2231 is a two-rack space device. It is a 31-band EQ, with standard ISO frequency centers beginning at 20 Hz and concluding at 20 kHz. The sliders are 60mm in throw and each channel has separate enumeration for frequency. The boost and cut range is 12 dB, or 6 dB, depending on the switch mode for range control, and both halves of the EQ section can be linked, such that the upper section has ultimate control over the other channel on the lower section.

Other features on the GEQ-2231 include a bypass switch on each channel, allowing for A/B comparisons of EQed system sound versus flat sound.

If all this sounds pretty standard for a graphic EQ, it is. But under the hood - completely unseen - is a 24-bit DSP that handles conversion and processing. There is no digital I/O. The internal processing is an impresive 64-bit.

There is a provision to apply in-board limiters to the signal of each half of the EQ, either linked (top channel controls the action of both halves of the EQ), or unlinked (each channel limiter is independent), with adjacent metering to show the comparison of gain reduction to initial signal. Each half of the Inter-M also features both high-pass and low-pass filtering with a slope of 18 dB per octave, allowing for cut of rumble and hiss, respectively. Also in this group of controls, resides the gain control, allowing for exact symmetry in level of the left and right.

The rear panel houses all the connectors, namely the input and output XLRs, arranged in channeled pairs along with their related TRS quarter inch input and output jacks. The electrical connection is achieved through use of an IEC type, three-blade connector.

In Use

The GEQ-2231 was employed in several concert and event applications. The first test of the Inter-M, was as a left and right EQ, inserted on the Mains Out at a concert featuring Beatles tribute band, Twist and Shout. The EQ functioned very well, handling quite a bit of signal, with no audible clipping, although the color LED bar graphs showed an occasional visit to the red zone.

On the same gig, the next night, we swapped the function of the EQs, inserting them on the sub master controlling the subs and the mono master controlling the center fills. Here again, very smooth sound, but the meters showing quite a bit of level.

For further testing of the EQ, we used it for additional FOH tests, using the cut-only, limiting and linking functions. In all cases, the EQ passed its tests exceedingly well. I took particular notice of the limiting function on several tests we conducted and found the threshold controls to be accurate and reliable. It did not trigger the limiter too early, and exhibited consistent engagement of signal level at both the threshold and the release. The high-cut and low-cut filters worked very well, by eliminating the noise of windy outdoor shows and the hiss of the occasional electronic input, without sacrificing the usable music spectrum.

Summary

We actually used the 2231 at almost 30 shows, ranging from national act concerts, to fair and festival acts to corporate speech-only situations. We thoroughly tested all of the features on the EQ, and found all to work quite nicely, especially the filter and limit functions. The Inter-M GEQ-2231 is a nice entry into the audio hardware wars, by a new company that was previously unfamiliar to me. Given the price range of this piece of equipment, and the amount of useful functions, I think it would be a fine addition to a system where budget coupled with quality the important consideration.

Review Setup:

Soundcraft Series Five 48 channel FOH console, Yamaha M3000, Allen and Heath ML series consoles; L'Acoustics 15-inch monitor, Carvin TCS 2500, TCS 2800 speaker.