Assessments - 2, GPA: 4
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Globally switch- able phantom power shall be available at the microphone inputs. 15. MIXER EXPANDER FUNCTION. The mixer buses shall accommodate up to 48 additional stereo input channels when connected to up to 3 Mackie Designs LM-3204E Expander units. The mixer shall be fitted with a 20-pin IDC-type “expander input” connector mounted on the rear of the mixer frame, which shall carry all audio and control signals Impedances. Mic preamp 21. INPUT CHANNEL input, 2.5 kW . All other in-CONNECTIONS. Each puts, 10 kW . All outputs, expander input channel between the mixer and the optional expander unit(s), if used; and which shall be designed to mate with the connectors on the expander ribbon cable provided with each Expander unit. 16. PHYSICAL CONFIGURATION. The mixer shall have a steel chassis frame painted grey-black and designed to mount in a standart 19" relay rack. The mixer’s dimensions shall be 8.73" high (5 rack units) by 19.00" wide (rack ears are built-in) by 9.66" deep. 17. OVERALL MINIMUM SPECIFICATIONS. In addition to specifications previously cited, the mixer shall meet or exceed the following performance criteria: Noise. (20 Hz–20 kHz bandwidth, Line inputs to Main L/R outputs, all channels assigned.) Master fader down, Channel gains down, –104.2 dBu. Master fader unity, Channel gains down (Mix Noise), –86.6 dBu. Master fader unity, Channels gains unity, –84.0 dBu. Total Harmonic Distortion. (1 kHz @ +14 dBu, 20 Hz–20 kHz.) Channel input to any output, below .0025% typical. Attenuation (1 kHz @ 0 dBu. 20 Hz–20 kHz bandwidth, Channel in, to Main Left outputs.) Channel gain down, –73 dBu. Channel muted, –81 dBu. Frequency Response. (Any input to Main output.) 20 Hz to 60 kHz, +0 dB/–1 dB. 10 Hz to 100 kHz, +0 dB/3 dB. Maximum Levels. Mic preamp input, +14 dBu. All other inputs, +22 dBu. All outputs, +22 dBu. 120 kW . Equalization. Lo EQ Shelving @ 80 Hz, ± 15 dB. Mid EQ Peak @ 2.5 kHz, ± 12 dB. Hi EQ Shelving @ 12 kHz, ± 15 dB. Microphone Preamp. E.I.N. (150 W terminated, maximum gain), –129 dBm. 18. DESIGNATION. The audio mixer shall be a Mackie Designs LM-3204. LM 3204E Expander 19. GENERAL CONFIGURATION. The expander unit shall not be designed to operate alone, but in conjunction with a Mackie Designs LM-3204 Line Mixer. The expander shall have a rack-mountable frame which accommodates 16 stereo input channels. Each input channel shall be capable of accepting either stereo or monaural signals, and shall be fitted with stereo level, equalization, balance, solo, muting and auxiliary send controls, level-indicating (–20) LEDs and overload (O/L) LEDs. Input channels 1 through 4 shall each be fitted with left and right insert jacks. Additionally, the expander shall include 4 stereo effects return inputs. 20. POWER SUPPLY. All necessary operating voltages for the expander shall be provided by an internal shielded power supply. shall have a left and a right electronically balanced line- level input, accommodating a nominal line level of between –10dBV and +4dBu, and appearing on the rear panel as 1/4" TRS phone jacks (tip hot, ring cold). The jacks shall be fitted with internal switches to accommodate monaural configuration. Additionally, input channels 1 through 4 shall offer left and right unbalanced insert connections, appearing on the rear panel as 1/4" TRS phone jacks (tip send, ring return). 22. INPUT CHANNEL LEVEL AND ASSIGNMENT CONTROLS AND INDICATORS. Each expander input channel shall be equipped with a rotary dual gain control, a solo switch, a mute switch which also functions as an assignment switch to the alternate output channels, and a stereo balance control. Additionally, any soloed channel(s) shall have their –20 and O/L LEDs light steadily, to indicate a solo condition. 23. INPUT CHANNEL EQUALIZATION. Each expander input channel shall be equipped with a stereo equalization function. The equalizer shall have three sections: a low-frequency shelving equalizer with the knee set at 80Hz and a range of ± 15dB; a mid-frequency peaking equalizer centered at 2.5kHz featuring a bandwidth of 2 octaves and a range of ± 12dB; and a high- frequency shelving equalizer with the knee set at 12kHz and a range of ± 15dB. 24. INPUT CHANNEL AUXILIARY SENDS. Each expander input channel shall have one stereo MACKIE DESIGNS INC. • 16220 WOOD-RED RD. N.E. WOODINVILLE • WA • USA • PHONE TOLLFREE 800/258-6883 FAX 425/487-4337 • OUTSIDE THE U.S., PHONE 425/487-4333 auxiliary send control and one monaural auxiliary send control. The auxiliary send controls shall be switchable between 2 sets of auxiliary send buses, accommodating a total of 2 stereo auxiliary send buses and 2 monaural auxiliary send buses. 25. AUXILIARY RETURN CONNECTIONS. The expander shall include 4 stereo auxiliary return inputs. Each auxiliary return shall have a left and a right unbalanced line-level input, accommodating a nominal line level of between –10dBV and +4dBu, and shall appear on the rear panel as 1.4" phone TRS phone jacks. The jacks...
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