Mackie SP400C instruction manual Specifications, System Acoustic, Transducers

B6.Pull the speaker cable through the conduit coupler and attach to the supplied Phoenix-type connector (8). This is a 4-position connector, with two "+" and two "–" terminals. Connect the speaker cable to the "+" and "–" terminals labeled IN. If connecting another speaker in a distributed system (in parallel), connect the speaker cable running to the next speaker to the "+" and "–" terminals labeled LOOP THRU.

		LOOP
			THRU
		IN	+
LOOP
	–
THRU–	IN	+

Conduit

HO	1		Coupler
L +
TO	2
R P	+
U
	I	3
	N
	–		4
	IN
		L	–
	TO
		HO
		R P
		U

Set-Screw

4.Set the Tap Selector Switch (12). Make sure all the taps in the system add up to less than the rated power of the amplifier driving them. As a general rule, you should provide at least 10% headroom to account for insertion losses (i.e., wiring resistance, etc.). For example, if you have four speakers tapped at 30 watts each, the amplifier should be rated at least 132 watts.

5.Set the Full-Range/High-Pass Selector Switch (13). For normal operation, set the switch to the FULL RANGE position. If a subwoofer is being used in the system to reinforce the very-low frequencies, use the HIGH PASS position to roll off the frequencies below 150 Hz. This provides the added benefit of making more power available for the crucial mid and high frequencies.

If the speaker is being used in a low-impedance system, use the FULL RANGE (16 OHM) position. This bypasses the tapped transformer.

6.Install the grille (1) by pressing it into place until the front of the grille is flush with the front baffle rim. It is important that the grille be securely seated to avoid having it vibrate loose.

B7.Close the terminal cover plate (7) and tighten the locking screw (7a) firmly.

B8.Insert the conduit into the coupler and fasten with the set-screw.

Note: A seismic safety tab (10) is provided to secure the loudspeaker to the building structure with wire cabling for additional support where required by local construction codes. We recommend using this secondary support for additional safety.

	15	30
7.5	7.5	15	30	100v
	3.7			70v

FULL	FULL
RANGE	HIGH RANGE
(16 OHMS)	PASS

7. Specifications

System Acoustic

Frequency Range:	70 Hz–22 kHz (–10 dB)	Control Features
Frequency Response:	89 Hz–20 kHz (–3 dB)	Front-mounted Rotary Switch:
		Full Range (70/100 Volt Systems)
Sensitivity:	92 dB	High Pass (70/100 Volt Systems)
		Full Range (16 Ω)(Low-Impedance Systems)
Crossover Point:	2000 Hz	Front-mounted Rotary Switch:
Power Handling:	120 watts peak	Secondary Tap Positions
	30 watts long term	Transducers:
Maximum SPL:	107 dB	Low Frequency
Transformer Taps		Number of Drivers:	1
		Woofer Size:	6.5" (165 mm)
70V:	3.75 W, 7.5 W, 15 W, 30 W
		Diaphragm Material:	Polypropylene
100V:	7.5 W, 15 W, 30 W
		Magnet Type:	Ferrite
Operation in High-Pass Mode		High Frequency:
Frequency Response:	150 Hz–20 kHz
		Diaphragm Size:	1.0" (25 mm)
Operation in Low-Impedance Mode		Diaphragm Material:	Damped Cloth
		Magnet Type:	Neodymium Dome
Frequency Response:	89 Hz–20 kHz

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