DOD 410 Series II P.A. / Monitor Processor in excellent condition. Thoroughly tested and in perfect working order.

This monitor/speaker processor is to be used in conjunction  with a sound reinforcement system, or can serve as the final EQ and level control for the monitor system.

The 2/3rds octave EQ allows you to quickly and easily modify a sound for use in music, recording, or sound reinforcement. The notch filters give you more control over notching out unwanted noise and the limiting and low cut features assist in protecting your amps and speakers.

1. Power Switch - Applies power to the 410.
2. Input Gain Stage - Controls the level of the input signal.

±12dB adjustment.

3. Input/Output Section - The EQ/Limit switch, switches in or out the graphic EQ, notch filters, and the limiter. This allows a comparison of the signal “wet” or “dry”. The input level and low cut filter are always in the signal path regardless of the switch position. The meter switch connects the LED level meter to the input (post input level) or the output.

4. Graphic EQ - This is a 15 band, 2/3rds octave graphic EQ. It provides ±12dB of gain for each band. The peak LED indi- cates that.the signal out of the EQ section is 3dB below clip- ping.

5. Notch Filters - These two filters are very narrow bandwidth notch filters that can provide 24dB of attenuation at the selected frequency. The x10 function allows you to change the range of each notch (see the graph below). These filters are “Disabled” by setting the depth control to the top (0dB cut). These filters are used primarily for eliminating feedback or hum from the P.A. or monitor systems.

6. Limiter - The limiter function features Automatic Variable Ratio LimitingTM. AVR Limiting behaves as a mild compressor with a soft knee at low threshold settings, and a hard knee lim- iter at higher threshold settings. This allows the limiter to func- tion as a mild compressor or as a limiter for speaker protection. The fast/slow speed switch affects both the attack and release time. This gives enough variety for most situations. The gain reduction meter displays the amount of gain reduction due to limiting.

7. Low Cut - A selectable low cut (high pass) filter that may be switched in or out and has selectable rolloff frequency of 40 or 80Hz.

Rear Panel

1. Balanced Output -Accepts a female XLR plug (see section on installation for wiring). Maximum balanced output level is 21dBu. Output impedance is 102Ω balanced.

2. Balanced/Unbalanced Output - Accepts a 1/4” tip-ring- sleeve balanced or 1/4” unbalanced tip-sleeve plug (see section on installation for wiring connections). Maximum output level is 21dBu. Output impedance is 20kΩ for the unbalanced con- nection and 40kΩ for balanced.

3. Balanced Thru Output - Accepts a female XLR plug (see section on installation for wiring connections). This output is hardwired to the input allowing the signal to be split off to another destination. Balanced output is possible only with a balanced input signal.

4. Balanced/Unbalanced Thru Output - Accepts a 1/4” tip- ring-sleeve balanced phone plug or a 1/4” unbalanced tip-sleeve plug (see section on installation for wiring connections).

5. Balanced Input - Accepts a male XLR plug (see section on installation for wiring connections). Maximum allowable input is 21dBu. Input impedance for the balanced connection is 102Ω.

6. Balanced/Unbalanced Input - Accepts a 1/4” tip-ring-sleeve balanced phone plug or a 1/4” unbalanced tip-sleeve plug (see section on installation for wiring connections). Maximum allowable input is 21dBu . Input impedance is 51Ω for the unbalanced connection and 102Ω for balanced .

INSTALLATION

Install the 410 in a rack with the provided rack screws. Route the AC power cord to a convenient power outlet away from audio lines.

Connections to the input and output jacks are made using 1/4” balanced tip-ring-sleeve (TRS) plugs, or 1/4” unbalanced tip- sleeve (TS) plugs, or balanced XLR plugs.

Once the 410 has been installed and adjusted, an optional 801 security panel may be installed to keep unauthorized persons from tampering with the settings.

APPLICATIONS

A. Using the 410 in conjunction with a real time analyzer (such as DOD’s RTA Series II), a calibrated microphone, and pink noise generator, the audio system may be tuned to make the overall audio spectrum response of the sound system and the room environment flatter in frequency response.

B. Greater gain-before-feedback characteristics may be achieved by turning up the sound system to the feedback point and attenuating the oscillating (ringing) frequency using the notch filters. Turn the system up to feedback again and attenuate the second oscillating frequency using the second notch filter.

C. Limiting sets the maximum allowable output level as set by the threshold control. Limiting prevents clipping in amps and protects your speakers.

D. Protection of amplifiers and speakers may be accomplished using the LOW CUT feature of the equalizer. Wind noise or dropped microphones can cause damage to the amps and /or speakers. However, by rolling off the extreme low frequencies, a measure of protection is added to the system without severely affecting the overall sound quality.

E. In noisy environments, the audio signal may be tailored for better intelligibility and penetration. This is particularly useful for public address systems.

F. Creative use of the equalizer allows shaping of the signal for a more pleasing sound or for special effects. The only limits are those of taste and imagination.