Filtering effects, Eliminating Feedback

4 Applications

Eliminating Feedback

During a live performance, you may experience feedback if a microphone is placed too close to a monitor. However, this feedback often occurs at one frequency before it happens at others. You can "ring out" the monitor by using EQ to cut the frequency that’s feeding back. The following is best to try when the band and audience are not present:

1.Insert the EQ between the mixer’s monitor output and the monitor amplifier.

2.Slowly and carefully raise the monitor level to the point of feedback. Notice that it always feeds back at the same frequency unless the mic is moved a lot. As soon as you hear feedback, turn the monitor level down, but not off.

3.Select a band that is near where you think the feedback is occurring. For example, if you’re getting high-frequency feedback, try 6.3 kHz.

4.Slowly raise the 6.3 kHz Band Gain level while listening for feedback. If you hear feedback, cut that frequency because you guessed right.

5.If you don’t hear feedback, return that band to “0” and repeat this procedure with another frequency band. Once you hear feedback, cut that frequency.

If you don’t hear feedback at any frequency using this method, try boosting the monitor level a little more.

Filtering effects

The answering machine

A popular vocal effect is to filter the voice to a limited frequency range. This “telephone” effect is also called “futzing,” and can be used on any instrument or mix. Here’s how to get that sound on the DEQ230:

1.Follow the instructions for items 1 and 2 from Step 2.

2.Press all of the [BAND SELECT] buttons in the ranges from 25 Hz to 630 Hz and from 6.3 kHz to 20 kHz on the channel you are using.

3.Use the [DOWN] BUTTON to reduce all of these frequencies until their LEDs are at -12 dB.

4.Select all of the unedited frequencies and boost them as high as you can without clipping the signal.

5.Be sure to toggle the [BYPASS] button to compare the result with the original.

This procedure can be an effective tool in isolating and eliminating feedback in the main or house system as well.

If the Numeric LED Display shows “Li” when you press [BAND SELECT] buttons on Channel B, it means the channels are linked. Either make the edits on Channel A, or return to Program mode and press [LINK/EXIT] to unlink the channels.

DEQ230, DEQ230D specifications

The Alesis DEQ230 and DEQ230D are sophisticated digital equalizers designed for audio professionals seeking precision in sound control. Equipped with advanced features and innovative technologies, these units cater to a variety of applications, from live performances to studio recordings.

Both models include a powerful 31-band graphic equalizer, allowing users to sculpt their sound with incredible accuracy. The DEQ230 and DEQ230D offer extensive frequency coverage from 20 Hz to 20 kHz, ensuring that all audible frequencies are managed effectively. The 1/3-octave resolution facilitates fine adjustments, enabling sound engineers to target specific problem frequencies within the mix.

One of the notable characteristics of the DEQ230 series is its dual-channel operation. The DEQ230 provides individual equalization for two separate channels, making it an excellent choice for stereo setups or multi-channel applications. The DEQ230D takes this functionality even further by incorporating digital connectivity, allowing for seamless integration with digital audio systems and enhancing flexibility in various setups.

In terms of technology, the DEQ230 and DEQ230D utilize state-of-the-art digital signal processing (DSP) to deliver high-quality audio performance while minimizing latency. These models feature comprehensive output level control and provide precise metering through LED indicators, which allows sound engineers to monitor levels easily while adjusting the EQ settings.

Moreover, both equalizers come equipped with a variety of memory presets. This feature enables users to save and recall specific settings, streamlining the workflow during live events or studio sessions. The intuitive interface ensures ease of use, with clearly labeled controls that facilitate quick adjustments on the fly.

Alesis has also prioritized durability in the design of the DEQ230 and DEQ230D. The robust construction and rack-mountable chassis make them ideal for both touring and permanent installations. Additionally, the inclusion of balanced XLR and TRS inputs and outputs guarantees compatibility with professional audio gear while minimizing signal degradation.

Overall, the Alesis DEQ230 and DEQ230D represent valuable tools for any audio professional, offering precision, versatility, and robust performance in a compact design. Their combination of advanced features and user-friendly interface makes them an excellent investment for enhancing sound quality in any audio environment.