Biamplified System with Active Crossover

Biamplified and Triamplified Systems Most speaker systems in use today are of

the two-way or three-way variety. Cone speak- ers are good at reproducing low and mid-range frequencies, but not high frequencies. Like- wise, compression drivers are good at reproducing high frequencies, but definitely not low frequencies. This is why two-way, three-way and even four-way speaker systems were developed — to improve the efficiency of each individual driver by requiring it to reproduce only the frequencies that it repro- duces best.

One method of accomplishing this is through the use of a passive crossover network between the amplifier and the speaker(s). Often the passive crossover is built into the cabinet along with the various drivers. The crossover divides the high-level speaker signal into frequency bands, which are then directed to the appropriate driver. There are some drawbacks to this method, however. The pas- sive crossover adds reactance to the load that the amplifier sees, which can affect the damp- ing. Power is wasted as heat across the resistors in the crossover, reducing the amount of amplifier power available to the drivers themselves.

			FR SERIES
	POWER AMPLIFIER
		(STEREO MODE)
		(STEREO MODE)
FROM SIGNAL SOURCE	CH 1		CH 1	+


(MACKIE MIXING CONSOLE)	IN		OUT	–
(MACKIE MIXING CONSOLE)	IN		OUT	–
FROM SIGNAL SOURCE	CH 2		CH 2 –
FROM SIGNAL SOURCE	CH 2		CH 2 –
(MACKIE MIXING CONSOLE)	IN		OUT +
(MACKIE MIXING CONSOLE)	IN		OUT +

Passive Crossover System

Biamplified and triamplified systems use separate power amplifiers to power each indi- vidual low-frequency and high-frequency driver. An electronic crossover (a.k.a. active crossover) is located between the signal source and the power amplifier. The advantages of this method include 1) increased headroom available from each amplifier, since they’re am- plifying only a portion of the entire audio spectrum; 2) improved damping factor be- cause the amplifier output is connected directly to the driver; 3) improved efficiency because there are no passive resistors to dissi- pate heat; and 4) flexibility to choose the optimum crossover frequency and crossover slope for the individual drivers in the system.

TWO-WAY SPEAKER CABINET

	HIGH-LEVEL	HIGH FREQUENCIES
	PASSIVE	HIGH FREQUENCIES
	PASSIVE	TO TWEETER
	CROSSOVER	TO TWEETER
	CROSSOVER
		LOW FREQUENCIES
		TO WOOFER

TWO-WAY SPEAKER CABINET

	HIGH-LEVEL	HIGH FREQUENCIES
	PASSIVE	HIGH FREQUENCIES
	PASSIVE	TO TWEETER
	CROSSOVER	TO TWEETER
	CROSSOVER
		LOW FREQUENCIES
		TO WOOFER

	FR SERIES
FROM SIGNAL SOURCE	POWER AMPLIFIER
(MACKIE MIXING CONSOLE)	(STEREO MODE)

FROM SIGNAL SOURCE

(MACKIE MIXING CONSOLE)

LOW-LEVEL

2-WAY ACTIVE CROSSOVER

				FR SERIES
		POWER AMPLIFIER
			(STEREO MODE)
TO HIGH-FREQUENCY	CH 1				+
AMPLIFIER	INPUT			CH 1	+
TO LOW-FREQUENCY	CH 2			OUT	–
				OUT	–
					–
	INPUT
AMPLIFIER	INPUT			CH 2
				OUT +
				OUT +

LOW-LEVEL

3-WAY ACTIVE

CROSSOVER

WOOF

TO HIGH-FREQUENCY		CH 1				+	TWEET
AMPLIFIER		INPUT			CH 1	+
TO MID-FREQUENCY		CH 2			OUT	–
					OUT	–
						–
		INPUT
AMPLIFIER		INPUT			CH 2
					OUT +		MID
					OUT +		MID

					FR SERIES
			POWER AMPLIFIER
				(BRIDGE MODE)
	TO LOW-FREQUENCY	CH 1				+
	TO LOW-FREQUENCY	INPUT			CH 1
	AMPLIFIER	INPUT			CH 1
					OUT	–	WOOF
					OUT	–
					CH 2 –


					OUT +
					OUT +

Biamplified System with Active Crossover

Triamplified System with Active Crossover

M1200/M1400 specifications

The Mackie M1200 and M1400 are two prominent power amplifiers that have gained recognition for their reliability, performance, and innovative design in the professional audio field. Engineered for both live sound and studio applications, these amplifiers deliver exceptional sound quality and unmatched power, making them a favorite among audio professionals.

One of the standout features of the M1200 and M1400 is their impressive power output. The M1200 boasts a power output of 1200 watts at 4 ohms, while the M1400 takes it a step further with 1400 watts at 4 ohms. This substantial power allows users to drive a wide range of speakers, making them suitable for various settings, from small clubs to large venues and outdoor events. Furthermore, they excel in providing clean, distortion-free sound even at high volumes.

Both models incorporate Mackie's patented Smart Protect DSP technology. This intelligent thermal and signal protection system helps prevent overheating and ensures that the amplifiers operate within safe limits, enhancing longevity and reliability. The DSP also contributes to superior sound quality, maintaining clarity and detail across different frequency ranges.

Another key feature of the M1200 and M1400 is their rugged construction. Designed for the rigors of touring and live performances, these amplifiers feature a sturdy chassis that withstands the challenges of transport and heavy use. Their efficient heatsink design allows for effective cooling, ensuring the amplifiers remain operational even under demanding conditions.

In terms of connectivity, both models are versatile. They offer XLR and TRS inputs, allowing compatibility with a variety of audio sources. The outputs include Neutrik Speakon connections, providing secure and reliable speaker connections. Additionally, the amplifiers have built-in limiters that help to prevent speaker damage by controlling signal levels.

The user-friendly interface of the M1200 and M1400 includes level control knobs, LED indicators for power and signal, and a comprehensive set of output options. This simplicity ensures that audio engineers can quickly adjust settings to cater to specific acoustic environments, making setup and operation seamless.

In conclusion, the Mackie M1200 and M1400 power amplifiers are remarkable for their powerful performance, durability, and advanced technology. Whether for live sound reinforcement or studio applications, these amplifiers continue to set a standard in audio excellence, proving their worth to sound engineers worldwide.