1. Introduction
Thank you for choosing the dbx 215s Dual Channel 15-Band Equalizer. This professional audio device is designed to provide precise frequency control for various sound reinforcement and recording applications. With its dual 15-band, 2/3-octave constant Q frequency bands, the 215s offers exceptional sound shaping capabilities and rugged reliability, making it an industry standard for touring, studios, and audio installations.
This manual provides essential information for the proper setup, operation, and maintenance of your dbx 215s equalizer. Please read it thoroughly before using the unit to ensure optimal performance and safety.
2. Important Safety Information
To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts inside. Refer servicing to qualified service personnel. Always observe the following safety precautions:
- Power Source: Connect the unit only to the specified power supply voltage as marked on the rear panel.
- Grounding: Ensure the unit is properly grounded to prevent electric shock.
- Ventilation: Do not block ventilation openings. Ensure adequate airflow around the unit to prevent overheating.
- Moisture: Do not expose the unit to rain or moisture. Do not place objects filled with liquids on the unit.
- Foreign Objects: Do not insert any objects into the unit's openings.
- Servicing: Do not attempt to service this unit yourself. Refer all servicing to qualified service personnel.
- Fuse Replacement: Replace fuses only with the same type and rating as specified on the unit's rear panel.
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.
3. Product Overview
The dbx 215s is a dual-channel, 15-band graphic equalizer designed for professional audio applications. It features intuitive controls and robust construction for reliable performance.
3.1 Key Features
- Dual 15-band, 1/3-octave constant Q frequency bands.
- Switchable boost/cut ranges of ±6 dB or ±12 dB.
- Front panel bypass switch for quick A/B comparison.
- ±12 dB input gain range for level matching.
- 4-Segment LED ladders for monitoring output levels.
- Inputs: ¼” TRS and female XLR (pin 2 Hot).
- Outputs: ¼” TRS and male XLR (pin 2 Hot).
3.2 Front Panel Controls
Figure 3.2.1: Front Panel of the dbx 215s Equalizer.
The front panel features two identical channels of equalization controls. Each channel includes:
- Input Gain Control: A rotary knob to adjust the input level.
- Range Switch: Toggles between ±6 dB and ±12 dB boost/cut range for the frequency sliders.
- Bypass Switch: Engages or bypasses the equalizer processing for that channel.
- Frequency Sliders: 15 individual sliders for adjusting specific frequency bands (e.g., 20Hz, 40Hz, 63Hz, ..., 16kHz).
- Output Level Meter: A 4-segment LED ladder display indicating the output signal level.
3.3 Rear Panel Connections
Figure 3.3.1: Rear Panel of the dbx 215s Equalizer.
The rear panel provides all necessary audio input and output connections, along with the power inlet:
- AC Power Inlet: Standard IEC power connector for connecting the power cord.
- Channel 1 & 2 Inputs: Both XLR (female) and ¼” TRS balanced input jacks are provided for each channel.
- Channel 1 & 2 Outputs: Both XLR (male) and ¼” TRS balanced output jacks are provided for each channel.
- Fuse Holder: Contains the main power fuse.
4. Setup and Installation
4.1 Unpacking
Carefully remove the dbx 215s from its packaging. Retain the original packaging materials for future transport or storage. Inspect the unit for any signs of damage that may have occurred during shipping. If damage is found, contact your dealer immediately.
4.2 Rack Mounting
The dbx 215s is designed for standard 19-inch rack mounting. It occupies 1U (one rack unit) of space. Ensure adequate ventilation space around the unit, especially if mounting other heat-generating equipment nearby.
- Align the mounting holes on the equalizer with the holes on your equipment rack.
- Secure the unit using appropriate rack screws (not included).
4.3 Audio Connections
The 215s offers both XLR and ¼” TRS balanced connections. For optimal performance and noise rejection, balanced connections are recommended.
- Input Connection: Connect the output of your mixer, preamplifier, or other audio source to the INPUT of Channel 1 and/or Channel 2 on the dbx 215s using XLR or ¼” TRS cables.
- Output Connection: Connect the OUTPUT of Channel 1 and/or Channel 2 on the dbx 215s to the input of your amplifier, powered speakers, or next device in the signal chain using XLR or ¼” TRS cables.
- Ensure all connections are secure and correctly wired (Pin 2 Hot for XLR).
4.4 Power Connection
- Before connecting power, ensure all audio connections are made and the unit's power switch (if present, though typically on the front for dbx EQs, this model has no explicit power switch on front, it's always on when plugged in) is in the OFF position or that the unit is not yet plugged into the AC outlet.
- Connect the supplied AC power cord to the IEC inlet on the rear panel of the dbx 215s.
- Plug the other end of the power cord into a suitable AC power outlet. The unit operates on 100-240V~, 50/60Hz.
5. Operation
5.1 Powering On/Off
The dbx 215s does not feature a dedicated power switch on the front panel. The unit powers on automatically when connected to an active AC power source. To power off, disconnect the AC power cord from the wall outlet or the unit's rear panel.
5.2 Basic Equalization
The 215s allows you to adjust the frequency response of your audio signal. Each of the 15 sliders corresponds to a specific frequency band. Moving a slider up boosts that frequency, while moving it down cuts that frequency.
- Input Gain: Use the Input Gain knob to set the overall input level. Aim for the green LEDs on the output meter to light consistently, with occasional yellow flashes, avoiding red clipping indicators.
- Range Switch (±6 dB / ±12 dB): Select the desired boost/cut range. The ±6 dB setting provides finer control, while ±12 dB offers a wider range of adjustment.
- Bypass Switch: Press this button to bypass the equalizer's processing. This allows for quick A/B comparisons between the processed and unprocessed signal. The LED above the switch indicates its status (typically lit when active, off when bypassed).
- Frequency Sliders: Adjust individual frequency bands to shape your sound.
- Low Frequencies (20Hz - 160Hz): Affect bass and sub-bass. Boosting can add warmth or punch; cutting can reduce muddiness.
- Mid Frequencies (250Hz - 4kHz): Crucial for vocals and instruments. Adjusting these can affect clarity, presence, or harshness.
- High Frequencies (6.3kHz - 16kHz): Control treble and air. Boosting can add sparkle; cutting can reduce hiss or harshness.
- Output Level Meter: Monitor the output signal level. Ensure the signal is strong enough without clipping (red LED).
When equalizing, it is generally recommended to make cuts rather than boosts to avoid introducing noise or distortion. However, the 215s is designed for high fidelity, allowing for effective boosts when necessary.
6. Maintenance
6.1 Cleaning
To clean the unit, use a soft, dry cloth. Do not use abrasive cleaners, waxes, or solvents. Ensure the unit is powered off and disconnected from the AC outlet before cleaning.
6.2 Fuse Replacement
If the unit fails to power on, the fuse may need replacement. The fuse holder is located on the rear panel near the AC power inlet.
- Disconnect the power cord from the AC outlet.
- Locate the fuse holder on the rear panel.
- Carefully pry open or twist the fuse holder cap (depending on type).
- Remove the old fuse and replace it with a new fuse of the exact same type and rating as specified on the unit's rear panel (e.g., T500mAL 250V). Using an incorrect fuse can damage the unit or pose a fire hazard.
- Securely close the fuse holder.
- Reconnect the power cord.
If the fuse blows repeatedly, there may be an internal fault. Contact qualified service personnel.
7. Troubleshooting
This section addresses common issues you might encounter with your dbx 215s equalizer. If you experience a problem not listed here, or if the suggested solutions do not resolve the issue, please contact dbx customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No power / Unit does not turn on. | Power cord not connected; AC outlet not active; Blown fuse. | Ensure power cord is securely connected. Check AC outlet with another device. Replace fuse as per Section 6.2. |
| No audio output. | Incorrect cable connections; Bypass switch engaged; Input gain too low; Source device not sending signal. | Verify all audio cables are correctly connected to inputs and outputs. Ensure bypass switch is disengaged (LED off). Increase input gain. Check if the source device is functioning and sending audio. |
| Hum or buzz in audio. | Ground loop; Unbalanced cables in a balanced system; Faulty cables. | Ensure all equipment is properly grounded. Try using balanced XLR or TRS cables. If hum persists, a ground loop isolator may be necessary. Test with different cables. |
| Distorted audio. | Input gain too high (clipping); Output level too high; Faulty component. | Reduce input gain until red clipping LEDs no longer illuminate. Lower the output level of the 215s or the next device in the chain. If distortion persists, contact service. |
| Sliders feel loose or unresponsive. | Normal wear; Internal issue. | The sliders on dbx units are known for their solid feel. If they feel unusually loose or do not affect the sound, contact service. |
8. Specifications
| Feature | Specification |
|---|---|
| Model Name | DBX215SV |
| Brand | dbx |
| Channels | Dual Channel |
| Bands per Channel | 15-band, 2/3-octave |
| Boost/Cut Range | Switchable ±6 dB or ±12 dB |
| Input Gain Range | ±12 dB |
| Inputs | ¼” TRS and Female XLR (pin 2 Hot) |
| Outputs | ¼” TRS and Male XLR (pin 2 Hot) |
| Frequency Response | 10Hz to 50kHz |
| Dynamic Range | 112 dB |
| Power Consumption | 15 watts |
| Voltage | 100-240V~, 50/60Hz |
| Dimensions (H x W x D) | 1.75 x 19 x 6 inches (4.45 x 48.26 x 15.24 cm) |
| Item Weight | 4.8 pounds (2.18 kg) |
| Color | Silver |
9. Warranty and Support
dbx products are manufactured to high quality standards. Your dbx 215s equalizer comes with a standard manufacturer's warranty. Please refer to the official dbx website or your purchase documentation for specific warranty terms and conditions.
Figure 9.1.1: Example of a warranty badge, indicating potential extended warranty options.
Some retailers may offer an extended 1-year warranty. Please check with your point of purchase for details regarding any extended warranty programs.
9.1 Customer Support
For technical assistance, troubleshooting beyond this manual, or warranty claims, please contact dbx customer support. You can typically find contact information on the official dbx website or through your product's registration materials.
A comprehensive User Guide (PDF) is also available for download from the dbx website or via the following link: dbx 215s User Guide PDF.
