Peavey SP4 3-Way Dual Speaker

PEAVEY SP4 Details ^top

Engineered for optimal sound reproduction with proven reliability continuing a 30-year legacy, Peavey SP enclosures feature patented asymmetrical Quadratic Throat Waveguide(TM) technology that helps deliver pristine, precise sound; Black Widow(R) loudspeakers with Kevlar(R)-impregnated cones, 4" ribbon-wire voice coils and exclusive field-replaceable baskets; the patented Radialinear(TM) Planar Phase Correction System; and titanium compression drivers with ferrofluid cooling.

Quasi-three-way, full-range, bi-ampable sound reinforcement system
RX(TM) 22 compression driver with ferrofluid cooling
Two 15 inch BWX Black Widow(R) 4 inch voice coil woofers
2000 watts program, 4000 watts peak
Patented Asymmetrical Quadratic Throat Waveguide(TM) technology
Patented Radialinear Planar Phase Correction System
Sound Guard(TM) III tweeter protection
Frequency Response: 52 Hz to 17 kHz (+/- 3 dB)
Sensitivity: 100 dB (1W/1m) anechoic
Full-range inputs include a Neutrik(R) Speakon(R) 4 pin jack and two 1/4 inch phone jacks
Bi-amp capability via internal wiring jumper
Trapezoidal enclosure
Hammertex durable covering material

The SP 4 is a quasi three-way speaker system comprised of two 15” Black Widow BWX SF series woofer with Kevlar® impregnated cones, and an RX22 compression driver loaded onto a constant directivity Quadratic Throat Waveguide.
The SP 4 has a trapezoidal-shaped enclosure, which reduces the buildup of standing waves inside the enclosure to minimize mid-bass and midrange coloration. The enclosure is constructed of aspen hardwood plywood augmented with dual-layered top and bottom panels covered with heavy duty textured black Hammertex™ and reinforced with high-impact plastic corners. A full-length, wrap-around perforated steel grille protects the front of the enclosure.

The two-way system consists of the following driver components: two 15” Black Widow BWX SF series woofers with Kevlar impregnated cones and dust caps. The woofer section is capable of over 1,000 watts of continuous power handling (AES Std 21984). The high frequencies are handled by a 2” RX22 titanium diaphragm compression driver utilizing ferrofluid cooling.

This superb driver is coupled to a Quadratic Throat Constant directivity waveguide (U.S. Patent #6,059,069) to provide smooth, even response, low distortion and good high frequency dispersion. This horn has an asymmetrical vertical polar response, aiming the main energy lobe down 10 degrees so it is aimed at the audience instead of over their heads. This reduces ceiling reflections, ensuring greater clarity and gain before feedback. The RX22 driver features the Radialinear Planar Phase Correction System (U.S. Patent #6,064,745), which provides a smooth and extended high frequency response.
Full-range input connection to the system is made via two 1/4” phone jacks and a four-pin Neutrik in parallel, and bi-amping flexibility is provided via an internal jumper that can be accessed by unscrewing and removing the input cup. The internal passive crossover features the Peaveyexclusive Sound Guard protection circuit for the tweeter and an advanced topology crossover with high-performance components to provide high power handling and reliability. Sound Guard provides long-and medium-term driver overload protection without impairing musical transients or dynamics on either the midrange or the tweeter when the system is used full range or when it is biamped. The crossover provides driver roll-off and protection as well as driver EQ for the woofer and horn for a clean, clear and smooth response. High-quality, reliable crossover components include polypropylene capacitors and high-current inductors. The optimal integration of the crossover with the selected drivers results in a smooth frequency response from 52 Hz to 17 kHz.

Despite its compact dimensions, this system can produce very high sound levels and handle 2,000 watts program power, resulting in high articulation and long-term reliability.

Frequency response
This measurement is useful in determining how accurately a given unit reproduces an input signal. The frequency response of the SP 4 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 4 combine to give a smooth frequency response from 52 Hz to 17 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 amplifier headroom available.

Harmonic distortion
Second and third harmonic distortions vs. frequency are plotted in figures 3 & 4 for two power levels. Ten percent (10%) of rated input power and either one percent (1%) of rated input power or 1 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
This unit is not designed for overhead suspension. Four large rubber feet are included on the bottom for floor use.

PEAVEY SP4 Specs ^top

Frequency response, 1 meter on-axis, swept-sine in anechoic environment:
52 Hz to 17 kHz (±3 dB)
Usable low frequency limit (-10 dB point):
45 Hz
Power handling:
Full range: 1,000 watts continuous 2,000 watts program 4,000 watts peak
Low frequency section: 1,000 watts continuous 2,000 watts program 4,000 watts peak
High frequency section: 60 watts continuous 120 watts program 240 watts peak
Sound pressure level, 1 watt, 1 meter in anechoic environment:
Full range:
100.0 dB SPL (2.83 V input)
Low frequency section: 101 dB SPL (2.83 V input)
107 dB SPL (2.83 V input)
Maximum sound pressure level (1 meter):
Full range: 130 dB SPL continuous 136 dB SPL peak
Low frequency section: 131 dB SPL continuous 137 dB SPL peak
Passive mid/high frequency section: 129 dB SPL continuous 135 dB SPL peak
Radiation angle measured at -6 dB point of polar response:
90° horizontal by 40° vertical
The vertical main polar lobe is angled down 10° with respect to straight ahead being +10, -30°
Transducer complement:
Low frequency section: 2 x 15" woofer, vented Black Widow® 1508-8 HE SF
High frequency section: 1 x .875" exit /51 mm voice coil RX™ 22 compression driver on an asymmetrical Quadratic Throat CD horn
Box tuning frequency:
Low frequency section: 58 Hz
Crossover frequency (internal passive):
Low frequency – high frequency 1,800 Hz
Recommended Active Crossover Frequency Region and Slope:
Low Frequency – High Frequency: 1,800 Hz at 12 dB/octave
Time Offset:
Low frequency: 0.0 ms
Mid/high frequency: 0.48 ms
Impedance (Z):

Input connections:
Full range: two 1/4" phone jacks, one Neutrik® four-pin Speakon® jack & bi-amp capability provided via an internal wiring jumper
Enclosure materials and finish:
Aspen hardwood plywood finished in Hammertex™ covering
Mounting provisions:
This unit is not designed for overhead suspension
Built-in SA-1 stand-mount adapter and four large rubber feet on bottom for floor use
Dimensions (H x W x D):
Front: 50.63” x 20.55” x 23.00” 1286mmx522 mmx584mm
Rear: 50.63” x 12.63” x 23.00” 1286mmx321 mmx584mm
Net weight:
127 lbs.(56.6 kg)

PEAVEY SP4 Artists ^top