JBL 7510

Commentary

An automatic microphone mixer developed using JBL's original electronic technology.

Equipped with 4-channel microphone input, it can be expanded up to 24 channels in 4-channel unit by adding separately sold modular unit 7510-01.
The input is a balanced type with 48 v phantom power supply function for condenser microphone.

It has a floating output, a direct output (unbalanced, 24 channels maximum) for supplying each input signal to an external effector device, and an auxiliary input (unbalanced, 1 channel maximum) for receiving the return signal from an external effector device.

The 7510 is designed to function as a normal manual mixer when the toggle switch on the panel is in the ON position, and to display its true value in the AUTO or PRIORITY position.

In the AUTO position, the digital logic circuit constantly compares the input common to all microphones (background noise) with the input to a specific microphone (signal sound), and operates only the desired channels. The digital logic circuit automatically controls the gain so that the output level remains constant regardless of the number of active channels. This allows a constant feedback margin to be maintained without dynamic range fluctuations or breathing, which cannot be avoided with conventional compressors and mixers. The rise time is 30 ms to 60 ms, reducing the influence on the rise of the local music signal. The threshold level is adjustable.

In the PRIORITY position, the channel set to this position takes precedence over other channels. This allows the chairman's remarks to be delivered in a meeting with priority over other channels.

It can be used as a high-speed, high-fidelity noise gate for multi-microphone recording. It can also be used as a concert SR to increase the system gain up to howling, and it can be used as a preset without adjustment.

Model Rating

Type	Microphone mixer
<Automatic mixer function>
Input attack time	10 ms to 10 μ s, variable
Input rise time	30-60 ns
Input release time	100 ms to 5s, variable
Each channel attenuator	26 dB (max), variable
<Microphone input>
Source impedance	150 Ω or Less (With D3F, Phantom Power Supply 48 v)
Input level	2.5mV
Maximum input level	31.5mV RMS
Other	Input 4 ch mounted Up to 24 ch is possible by adding modules 7510-01 (4 ch)
<Aux input>
Source impedance	2k Ω or less (unbalanced, 6 mm phone jack)
Input level	1.23V RMS(+4dBm)
Maximum input level	11V RMS
Maximum Gain
Input module	65 dB (600 Ω load), 72 dB (270k Ω load)
Output module	9 dB (600 Ω load), 12 dB (220k Ω load)
Total gain	78 dB (600 Ω load), 83 dB (220k Ω load)
<Others>
Load impedance	600 Ω or More (D3M)
Output impedance	360 Ω (1 kHz)
Maximum output level	+ 25 dbm (cataloged) + 24 dbm (as described in the technical manual)
Frequency characteristic	20 Hz ~ 20 kHz ± 0.3 dB (listed in catalog) 20 Hz to 20 kHz ± 0.5 dB (described in technical manual)
NOISE	-130dBV (150 ohm input, output 0.775 V RMS)
Total harmonic distortion factor	0.075% (listed in the catalog) 0.2% or Less (Microphone Input → Main Output, 35 Hz to 20 kHz, Technical Manual)
Direct output	Load impedance : 600 Ω or more (unbalanced 6 mm, phone jack) Output impedance : 600 Ω Maximum power level : + 16 dBm
Pwer	100 VAC - 120 V, 50Hz/60Hz
External dimensions	Width 483x Height 133x Depth 292 mm (3 EIA Standard Size)
Weight	Body : 6.1 kg (4-ch mounting) Input Module 7510-01 : 0.7 kg
Sold Separately	Expansion module for 7510 (4 ch) 7510-01 (¥ 250,000)