Carvin CX1272 manual CX Overview, Shelving EQ with Active Tone Circuits, Internal Signal Routing

CARVIN ENGINEERING DATA CX672 6CH, CX872 8CH & CX1272 12CH STEREO MIXER OPERATING MANU-

AL

RECEIVING INSPECTION—read before getting started

CX672 / CX872 / CX1272 / CX1272R

Congratulations on the purchase of your CX mixer. Your new CX series mixer demonstrates CARVIN’s commitment to producing the highest quality and most sophisticated engineering in the audio industry today. The CX series mixers were designed to be professional mixers in com- pact units. The CX includes a full function stereo mixer, with two nine band graphic equalizers, a digital signal effects processor and a powerful stereo amplifier. A rack mount version is also available without power amps. Each CX series mixer is surrounded by a strong, lightweight 3/4” poplar plywood cabinet covered with Duratuff II™ carpeting making the CX mixer road worthy.

CX OVERVIEW

The MIC/LINE input channels feature XLR and 1/4” LINE inputs with phantom power for condenser mics. There are 3 bands of EQ, a post fader effect send, and a monitor pre- fader send on each channel. The master section features two 9 band graphic EQs, master stereo main and monitor mix controls, a complete 16 program effects processor with send and return controls, and a stereo external effects return.

“SHELVING” EQ WITH ACTIVE TONE CIRCUITS

The CX series incorporates 3 bands of EQ per channel. They offer smooth tone curves so your adjustments will sound natural and yet be effective. The high (treble) and low (bass) “shelving” type controls cover the complete upper and bottom portions of the audio range. The MID EQ controls are a “band pass” type which peak at 2.2k Hz for added presence to your mid range tones. Because CARVIN uses “active” tone circuits, you are able to boost or cut your tones without any signal loss to your sound.

INSPECT YOUR MIXER FOR ANY DAMAGE which may have occurred during shipping. If any damage is found, please notify the shipping company and CARVIN immediately. SAVE THE CARTON & ALL PACKING MATERIALS. In the event you have to re-ship your unit, always use the original carton and packing material. This will provide the best pos- sible protection during shipment. CARVIN and the shipping company are not liable for any damage caused by improper packing.

SAVE YOUR INVOICE. It will be required for warranty service if needed in the future. SHIPMENT SHORTAGE. If you find items missing, they may have been shipped sepa-

rately. Please allow several days for the rest of your order to arrive before inquiring. RECORD THE SERIAL NUMBER on the enclosed warranty card or below on this man-

ual for your records. Keep your portion of the card and return the portion with your name and comments to us.

INTERNAL SIGNAL ROUTING

Your balanced mic or instrument plugs directly into the high quality XLR Neurtric™ connectors and is then routed into the differential circuits for excellent hum and noise cancellation. As your signal continues within the console, a double-sided printed circuit board (FR-4 fire rated) carefully guards the circuit traces with a copper shield running over the traces. This eliminates RF interference and reduces crosstalk substantially. The printed circuit board has plated-through holes which means that every component is soldered securely in three places (bottom, in the hole and on top). This offers unsur- passed component security while reducing circuit resistance for pure dynamic sound.

HEADROOM

Headroom is very important when designing a mixer—especially for recording. Lack of headroom will cause your sound to become distorted and muddy. This can happen when you turn the volume too high, if the input signal is too hot or if excess bass or treble is added. With most mixers, you have to reduce the input gain to fight headroom problems, but this just increases noise. That’s why we have taken great care in the CX series to make sure that each gain stage is properly designed and balanced for more headroom along the entire audio path.

TOROID SUPPLY

A big feature in the CX power supply is the precision wound Toroid transformer (not available from our competitors) that offers lighter weight with massive current capabil- ity for the power amp. The toroid based power supply also offers unsurpassed rejection of noise and hum while providing precision voltage for all preamp stages. Now you can go anywhere and never worry about inconsistent sound due to fluctuating voltages. CARVIN has spared no expense to achieve the best possible quality & performance.

For your records, you may wish to record the following information.

Serial No._____________________ Invoice Date_______________

CX672, CX872 & CX1272 SPECIFICATIONS:

CX672, CX872, CX1272 BLOCK DIAGRAM

-20dB	LR MON EFF	LEFT
PAD SWITCH		TAPE OUT

				NINE BAND
	THREE BAND	PAN		GRAPHIC	LEFT
MIC	CHANNEL TONE			EQUILIZER
					LINE OUT
PRE	CONTROLS		LEFT
PAD			AMP PATCH

line pad					MAIN LEFT
(-26dB)					SUMMING AMP
			CHANNEL		AND LEVEL	RIGHT
HI	MID	LOW	LEVEL	CHANNEL		TAPE OUT
				EFF SND		NINE BAND
						GRAPHIC
							RIGHT
						EQUILIZER
						RIGHT	LINE OUT
						AMP PATCH
				CHANNEL	MAIN RIGHT
CHANNEL				MONITOR	SUMMING AMP
				LEVEL	AND LEVEL	MONITOR	TO INTERNAL
						LINE OUT	POWER AMP

STEREO RETURN	DSP RETURN LEFT
FOR INTERNAL		DSP TO	MONITOR
STEREO DSP
		MONITOR	SUMMING AMP

EFFECTS

SEND 2

	DSP RETURN RIGHT
	EFFECTS		EFFECTS
	SUMMING AMP	EFFECTS
			SEND 2
		SEND 2	GAINSTAGE
TAPE RTN LEFT		LEVEL

EFF INPUT LEFT
		GAIN
	EFFECTS RETURN LEFT	REDUCTION
		FOR DSP	INTERNAL
			DSP SEND

TAPE RTN RIGHT

EFF INPUT RIGHT

EFFECTS RETURN RIGHT

Frequency Response:	Mic or Line Inputs: 20Hz-20KHz ±2dB
Total Harmonic Distortion: Less than .1%
Equivalent Input Noise:	150 ohm source: -110dBu
Output Noise:	-90dBu Master Line Out
	(all levels minimum)
Output Power:	(Power Mixers Only)
CX872 & CX1272 :	8Ω : 175/175 w, 4Ω : 250/250 w
	2Ω : 375/375 w, less than 1% THD
Output Headroom:	+20dB 1/4” unbalanced
Maximum Gain:	Mic in to Master Line Out: 70dB
Crosstalk:	Adjacent ch’s: -60db at 1KHz
Common Mode Rejection:	-80db at 1KHz
Phantom Power:	All XLR Mic in channels
Channel EQ.:	3 band active,	LOW: 80Hz
±12dB
	MID: 2.2KHz ±12dB
	HI: 11.5KHz ±12dB
Graphic EQ.:	9 Band Oct. Intervals ±12dB
Mic Input:	Balanced XLR input
Line Input:	Unbalanced 1/4” Phone Jack
Power Consumption:	700VA
Size:	11”H x 19.5”W x9”D
	Rack Model: 8.75”H x 19”W x 7.75”D

	12340 World Trade Drive, San Diego, CA 92128
	(619) 487-1600 (800) 854-2235
76-01272 0798	www.carvin.com