Peavey 4X specifications Amplitude Response, 1W 1m On-Axis, Impedance

High frequency:

Nominal: 8.0 Ω

Minimum: 6.0 Ω

Input connections:

1x 1/4 in. phone jack (input), 1x 1/4 in. phone jack (thru only) and 1x Neutrik® NL4 Speakon® (biamp only)

Enclosure materials and finish:

3/4" OSB finished in black carpet

Mounting provisions:

This unit is not designed for overhead suspension

Dimensions (H x W x D):

Front:

49.00in. x 21.00 in. x 22.75 in.

1245 mm x 533 mm x 578 mm

Rear:

49.00in. x 14.00 in. x 22.75 in.

1245 mm x 356 mm x 578 mm

Net Weight:

125 lbs. (56.8 kg)

Features:

•	Quasi three-way, full range/
	biampable PA enclosure
•	Sound Guard™ HF driver protection
	circuit
•	RX22™ driver with a 2" titanium
	diaphragm coupled to a CH® 941 90°
	X 40° constant-directivity horn
•	Dual 15" BWX Black Widows® with
	Kevlar® cones and field replaceable

sound due to the cabinet. The SP 4X is constructed of 3/4" OSB and covered with Peavey’s durable black carpet. Polymer corners are also a part of the unit to provide added protection to the enclosure. A powder-coated expanded, metal grille covers the lower part of the front of the enclosure to protect the low frequency driver from unforeseen accidents.

A voicing switch on the input cup allows for the selection of two different response settings for the loudspeaker system. The normal position will yield a more flat response. The EQ position will have decreased output in the mid-range and upper mid-range areas. This position may be preferred for some types of program material. The response curve for each position is given in figure 1.

Sound Guard III is the redesign of Peavey’s proprietary circuit for high frequency driver protection for the new RX22 compression driver. This is an integral part of the crossover for the SP 4X. The input signal is routed through the Sound Guard III circuit in both full-range and biamp modes of operation. When the high frequency drive level to the SP 4X exceeds a predetermined threshold the Sound Guard III circuit in engaged. The effect that this has is to subtly decrease the signal level going to the RX22 so that it will not be damaged due to long-term overpowering. Short duration transients

will not be attenuated by Sound Guard III and have the possibility to damage the RX22. The Sound Guard III circuit is a dynamic circuit that will attenuate the signal more the larger the signal is, very similar to a compressor. This is accomplished through the use of a specially selected dynamically resistive light bulb. If the bulb in your Sound Guard

IIIshould ever burn out, a replacement may be obtained from an Authorized Peavey Service Center. However, if a Peavey replacement bulb is not readily available, a Sylvannia SK3 bulb may be located at various loudspeaker or electronics parts stores.

Frequency Response

This measurement is useful in determining how accurately a given unit reproduces an input signal. The frequency response of the SP 4X is measured at a distance of 1-meter using a 1 Watt (into the nominal impedance) swept-sine input signal. As shown in figure 1, the selected drivers in the SP 4X combine to give a smooth frequency response from 51 Hz — 16 kHz.

Power handling

There are many different approaches to power handling ratings. Peavey rates this loudspeaker system’s power handling using a full-range form of the AES

	baskets
•	SP™ X series trapezoidal cabinet
	and styling
•	External voicing switch
•	Neutrik biamp jack

Description

The SP 4X is both a cosmetic and performance redesign of the SP 4G loudspeaker system. This high power handling, two-way loudspeaker system is comprised of a 15" BWX woofer with a Kevlar impregnated cone and an RX22 compression driver coupled to a CH 941 constant directivity horn. This unit can be driven in full-range mode simply by plugging into the 1/4" phone jack on the input plate. A thru-only 1/4" phone jack connector is also provided to allow a second loudspeaker to be connected without making a cable run back to the amplifier. A Neutrik Speakon connector is provided as an input for biamp operation. The trapezoidal design of the enclosure allows arrays to be constructed much more easily than it would be using a rectangular shaped box. This shape also greatly reduces the build-up of standing waves on the inside of the enclosure. This ensures a minimum of mid-bass and mid-range coloration of the reproduced

		Amplitude Response				(1W 1m On-Axis)
	110
Pa)	100
20	90
(re
SPL	80
								Switch Position
dB	70
									Normal
	60								EQ
		50	100	200	500	1k	2k	5k	10k	20k
	20
	Figure 1				Frequency (Hz)

					Impedance
	100
	50
	30
	Z 20
(	) 10
	5
	3
	2
	1	50	100	200	500	1k	2k	5k	10k	20k
	20
	Figure 2				Frequency (Hz)