|Filter Type||Constant Q -3% center accuracy|
|Frequency Bands||2 x 31, 1/3 octave, ISO spacing|
|Frequency Response||20Hz- 20kHz, +/-0.5dB|
|Indicators||OUTPUT NOISE: -94dBm (unweighted)|
|Input Impedance||20K ohms typical|
|Input/Output Connections||Active balanced XLR and 1/4" TRS, Unbalanced RCA|
|Maximum Input Level||+22dBm|
|Maximum Output Level||+22dBm|
|Power (Switchable)||95-125 VAC, 50/60Hz, 190-250 VAC, 50Hz|
|Range||+/-6dB or +/-12dB selectable|
|Total Harmonic Distortion||.01% (20Hz-20kHz+10 dBu )|
|Dimensions||7.5" d x 19.0" w x 3.5" h|
The HQ231 Dual 31-band Graphic EQ is perfect for any live sound application where there is a high feedback potential including monitor mixes, side-fill cabinets or high powered front-of-house mixes situations.
The HQ231 features ART's proprietary FDC™ (Feedback Detection Circuit), with constant Q circuitry capable of delivering a 3% center frequency accuracy. Professional features like LED level metering, selectable 6dB or 12dB slider range, active balanced and unbalanced input & output connectors, RFI filters, independent variable Hi Pass (low cut) and Low Pass (high cut) filters, variable input level control, passive bypass switch, clip level indicator, ground lift switch, and selectable line voltage switch make it ideal for any professional application or touring system.
FDC Feedback Detection Circuit
FDC (Feedback Detection Circuitry - designed and developed by ART Engineering) instantly illuminates an LED on the corresponding EQ band fader with the greatest sustained signal. The LED indicators can immediately show which band corresponds to the feedback frequency, allowing the sound engineer to reduce gain in that band to quickly kill the feedback while having a minimal impact on the sound of the live program material.
The FDC also acts as a simple spectrum viewer while the concert proceeds showing where the "hot" areas are. During system setup and sound check, the FDC may be used to help identify room and sound system resonances. By increasing the gain until feedback, it is easy to identify those frequencies that are likely to be problems. Reducing the gain in these bands helps tune the sound system, and, remove problem areas before the show begins. It also helps increase the gain margin before feedback.
The HQ231 features Constant-Q Filtering, which helps the HQ's FDC work with greater efficiency while offering superior overall performance of the EQ. Constant-Q ensures that even when making radical adjustments to a frequency band, that adjacent bands will not be affected. This is particularly critical in professional applications including monitor mixes and feedback control.
Professional Feature Set
Professional features like 45mm center detent sliders with selectable boost or cut range of 6dB or 12dB ensures the HQ231 can be used for radical tone shaping, or precise control of a sound system. Versatile connection to any live sound system or installation can be easily made using balanced XLR, 1/4-inch TRS and unbalanced RCA input and output jacks included on the HQ231 back panel.
High and low pass filters, analog level metering, variable input level controls, signal clip level indicators, ground lift switch, internal power supply and selectable line voltage complete the HQ231 Dual 31-Band Graphic EQ's full feature set.
- FDC™ Feedback Detection Circuit
- Dual Channel 31-Band Graphic Equalizer
- Output Level VU Metering on Each Channel
- Constant-Q Filtering
- Individual High and Low Pass Filters on Each Channel
- Center-Detented Frequency Band Sliders
- Independent Level and Bypass Controls on Each Channel
- Relay Bypass - If Power is Lost, Signal Will Still Pass
- Variable Input Controls
- Signal Clip Level Indicators
- Ground Lift Switch
- Internal Power Supply
- Selectable Line Voltage
Our team of musicians fuses the spirit of the local guitar shop with the convenience of the web by creating a reliable and worry-free buying experience.
At Music Store Live, our goal is to revolutionize the way gear is bought online. It’s not just about videos and know how; it’s about the person on the other end of the line. Whether you are in Tokyo or Toledo, we invite you to experience the reality of a living online music store and help us shape the best buying experience possible. As you'll see in the video below, we're musicians just like you. We strive to offer the best gear, the best online experience, and the best personalized service in the industry. We invite you to get to know our team, and we would love the opportunity to get to know you too!
Free Shipping - No Hassle Returns - 30 Day Trial Period
At Music Store Live, we are proud to offer free shipping on just about everything we sell. We’ve also got one of the best return policies in the business giving you a full 30 day trial period that starts when you receive your order for all new* items. It's all part of our mission to bring the guitar shop to your living room. This policy allows you to get your gear hassle-free and try it with your own rig to be sure that it truly fits with your playing style and sound. If it doesn't work the way you had hoped, we’ll provide you with return authorization information to send it back for an exchange, a refund, or in-store credit. But no matter what, we’ve got your back and we are here to help make sure you end up with the right gear for you. You’ll never be stuck with something you aren’t happy with.
Return Policy Details
What if there’s something defective with the item I purchased or it arrived with shipping damage?
We’ve got some of the best guitar techs around to test out every instrument before it leaves our shop and give everything a full setup. We’re confident your order will arrive ready to rock right out of the box. Our awesome warehouse staff put time and care into packaging your order up to make sure it all arrives to you safely. But let’s be honest, once in a blue moon stuff happens that’s out of anyone’s control. If you received an item which you believe is faulty, shows signs of shipping damage, or in any way doesn’t meet your expectations based on the description in the listing, please do not hesitate to contact one of our Gear Experts. No matter what happens, we want to make it right! (note: If you believe there to be shipping damage, please do not discard the packaging that your order came in and please make sure to contact us within 24 hours of receiving your delivery)
What if I’m not liking it or it’s just not working out for me?
Is something you purchased from us just not doing it for you? We understand and we absolutely want you to be thrilled with any gear that you buy from Music Store Live. If you're not happy with your order, you can return it to us within 30 days of delivery*. You are welcome to return it for a refund, an exchange, or in-store credit.
- Please allow 2-4 business days from the receiving date for returns to be processed.
- If your purchase qualified for free shipping, we may withhold our outbound shipping costs from any refunds processed as part of the return.
- Contact MSL at firstname.lastname@example.org or call (866) 256-5725 to begin the return process. Anything sent back to us must have an RMA number and we may refuse returns that did not receive prior authorization.
- Return the item(s) in its original packaging and in a way that will help ensure its safe arrival back to us.
- Just as we’re responsible for getting your order to you safely, you are responsible for returning the item(s) to Music Store Live in its original condition. Please take care with packaging it back up and preparing it for the return shipping journey. We recommend you add insurance to higher value items when sending them back.
- All returns will go through a technical inspection and are subject to a restocking fee if the item is not returned in its original condition. Restocking fee to be determined by MSL but is not to exceed 15% under typical circumstances.
- * B-Stock, C-Stock, E-Stock, Open Box, and Used items are subject to a 7-day trial period.
Is there anything that you guys won’t take back or that does not apply to your return policy?
We definitely want to work with you and be as flexible as we can to earn your business and to make sure you’re happy with everything you purchase from us. Unfortunately, there are some things that we simply cannot take back once it’s sold. That includes:
- Custom orders or instruments with modifications (pickup installs, straplock installs, tuner installs, etc)
- Software or authorization keys
- Guitar amp tubes or cabinet speakers
- Pickups that have been installed
- Strings that have been installed
- Drum heads and cymbals that show signs of use
- Personal items (earphones, harmonicas, instrument mouthpieces, etc.)
- Turntable cartridges
- Control vinyl
When sending back a return, please make sure that the return merchandise authorization number (RMA) provided by one of our Gear Experts is clearly written on the label of your return. To help avoid any restocking fees, please don’t write anything on the packaging. Please return all of the original packaging and its contents. We must receive the item/order back in a condition that allows us to resell it in the same condition it was originally in when we sent it out.
Your return label should look something like this:
Music Store Live
Attn: RMA XXXXX
300 W. 28th St, ste 102
National City, CA 91950
(Note: Purchases made through third party marketplaces such as eBay, Reverb, or Amazon have their own policies and criteria for returns. Please ask if you have any questions regarding that process.)
Shipping Policy Details
In most cases we ship new orders out within 1 business day of receiving payment. Here are some things to note:
- An indirect signature will be required upon delivery for all transactions over $250. If you would like to require a signature on a transaction of less than $250, please request it when you place your order.
- Your order must ship to the billing address associated with your credit card, PayPal, or other method of payment. If you need to use a shipping address that differs from your billing address, feel free to contact a Music Store Live Gear Expert and we can help you out.
- If you want the shipment to be held at a shipping company hub it is your responsibility to make those arrangements directly with the shipping company. If you’d like it held at a local FedEx facility, for example, please provide us with the full address of that facility before your order is shipped. This works out better than trying to re-route it once it’s in transit.
- We do not insure packages valued under $3,000. If you would like to add insurance for delivery please request it when requesting your order. Whether you choose to or not, we will still assume all of the responsibility in getting your item to you safely.
- Orders shipped within California will be subject to 7.25% state sales tax.