Peavey SP 112MX User Manual

SP™112MX

SPECIFICATIONS

Frequency response, 1 meter on-axis, swept-sine in anechoic environment:

120 Hz — 14 kHz (±3 dB)

Usable low frequency limit (-10 dB point):

73 Hz

Power handling:

Full Range:

500 W continuous 1,000 W program 2,000 W peak

Low Frequency Section:

500 W continuous 1,000 W program 2,000 W peak

High Frequency Section:

60 W continuous 120 W program 240 W peak

Sound pressure level, 1 Watt, 1 meter in anechoic environment:

Full Range:

100.0 dB SPL, (2.83 V input)

Low Frequency Section:

100.0 dB SPL, (2.83 V input)

High Frequency Section:

106.0 dB SPL, (2.83 V input)

Maximum sound pressure level (1 meter):

Full Range:

125.0 dB SPL continuous

131.0 dB SPL peak

Low Frequency Section:

126.0 dB SPL continuous

132.0 dB SPL peak

High Frequency Section:

123.8 dB SPL continuous

129.8 dB SPL peak

Transducer complement:

Low Frequency Section:

1x 12 in. woofer, sealed 1208 SPS-8 BWX

High Frequency Section:

1x .875 in. exit/51 mm voice coil compression driver on CD horn RX

™

22 on a CH®-3

Harmonic distortion:

1% rated power 2nd Harmonic:

100 Hz: 1.66% 1 kHz: 0.49%

3rd Harmonic:

100 Hz: 0.63%

1 kHz: 0.44% 10% rated power 2nd Harmonic:

100 Hz: 4.05%

1 kHz: 2.13% 3rd Harmonic:

100 Hz: 2.67%

1 kHz: 0.52%

Crossover frequency (internal passive):

Low Frequency — High Frequency:

1,350 Hz

Recommended active crossover frequency region and slope:

Low Frequency — High Frequency: 1,600 Hz at 18 dB/octave

Time offset:

Low Frequency: 0.00 ms High Frequency: 0.27 ms

Impedance (Z):

Full Range:

Nominal: 8.0 Ω Minimum: 6.2 Ω

Low Frequency:

Nominal: 8.0 Ω Minimum: 6.9 Ω

High Frequency:

Nominal: 8.0 Ω Minimum: 7.1 Ω

Input connections:

2x 1/4 in. phone jack and 1x Neutrik

NL4 Speakon®(biamp)

SPECS

PEAVEY ELECTRONICS

Enclosure materials and finish:

3/4" OSB finished in black carpet

Mounting provisions:

This unit is not designed for overhead suspension. SA 1 stand mounted adaptor

Dimensions (H x W x D):

Front:

15.25 in. x 22.25 in. x 15.00 in. 387 mm x 565 mm x 381 mm

Net weight:

50 lbs. (22.7 kg)

Features:

• Two-way, full range/biampable PA enclosure

• Sound Guard

™

HF driver protection

circuit

• RX

™

22 driver with a 2" titanium diaphragm coupled to a CH®3 90° X 45° constant-directivity horn

• 12" BWX Black Widow®with Kevlar

cone and field-replaceable

basket

• SP™X series cabinet with integral stand adapter

• Neutrik

biamp jack

• 30oor 45obaffle angle

Description

The SP 112MX is both a cosmetic and performance redesign of the SP 112M floor monitor loudspeaker system. This high power handling, two-way loudspeaker system is comprised of a 12" BWX woofer with a Kevlar impregnated cone and an RX22 compression driver coupled to a CH 3 constant directivity horn. This unit can be driven in full-range mode simply by plugging into one of the two 1/4" phone jacks on the input plate. A Neutrik Speakon

connector is provided as an input for biamp operation. The unique design of the enclosure allows the baffle to be angled at either 30° or 45° from the floor. The SP 112MX is constructed of 3/4" OSB and covered with Peavey’s durable black carpet. A powder coated expanded metal grille covers the front of the enclosure to protect the drivers from unforeseen accidents. A stand mount adapter is also included in one of the ends of the enclosure. This will allow it to be used as a PA type loudspeaker if needed.

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 112MX. The input signal is routed through the Sound Guard III circuit in both fullrange and biamp modes of operation. When the high frequency drive level to the

SP 112 MX exceeds a predetermined threshold, the Sound Guard III circuit is 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 longterm 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 III should 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 112 MX 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 112MX combine to give a smooth frequency response from 120 Hz - 14 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 Standard 2-1984. Using audio band 20 Hz to 20 kHz pink noise with peaks of four times the RMS level, this strenuous test signal assures the user that every portion of this system can withstand today's high technology music. This rating is contingent upon having a minimum of 3 dB of amplifier headroom available.

Harmonic Distortion

Second and third harmonic distortions vs. frequency are plotted in figures 3 and 4 for two power levels. Ten percent (10%) of rated input power and either one percent (1%) of rated input power or one Watt, whichever is greater. Distortion is read from the graph as the difference between the fundamental signal (frequency response) and the desired harmonic. As an example, a distortion curve that is down 40 dB from the fundamental is equivalent to 1% distortion.

Mounting

Warning: This unit is not designed for

overhead suspension.

Amplitude Response (1W 1m On-Axis)

110

100

dB SPL (re 20 Pa)

20 50 100 200 500 1k 2k 5k 10k 20k

Figure 1

Frequency (Hz)

Impedance

100

50 30

(

)

5 3

2 1

20 50 100 200 500 1k 2k 5k 10k 20k

Figure 2

Frequency (Hz)

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