Brands Guides About
Peavey SP 4BX Passive Speaker Dual 15
Peavey SP 4BX Passive Speaker Dual 15
Peavey SP 4BX Passive Speaker Dual 15
Peavey SP 4BX Passive Speaker Dual 15
Peavey SP 4BX Passive Speaker Dual 15
Peavey

Peavey SP 4BX Passive Speaker Dual 15" Black Widow Woofers

15 inch4 inch1W

Peavey SP 4BX passive speaker with dual 15" Black Widow woofers delivering 4000 watts of peak power for large venue sound reinforcement.

View price on Amazon
Affiliate Disclosure: Studio Supplies may earn a commission from qualifying purchases made through links on this page, at no additional cost to you. This helps support our editorial team.

Notice a mistake? Let Us Know

Overview

The Peavey SP 4BX is a full-range passive speaker enclosure engineered for professional sound reinforcement in medium to large venues. At its core are two 15-inch BWX Black Widow woofers, each built with a 4-inch voice coil that allows them to handle high power levels while maintaining clean output across low and mid frequencies. The RX 22 compression driver handles the high-frequency range, ensuring vocal clarity and detail cut through even at elevated volume levels. With a program power rating of 2000 watts and peak handling of 4000 watts, the SP 4BX is built for demanding applications where sustained high-output performance is essential.

The 100 dB sensitivity at 1 watt/1 meter means this speaker converts amplifier power into sound pressure efficiently, so you get substantial volume without pushing your amplifier to its limits. Input connections include a Neutrik Speakon 4-pin jack alongside two 1/4-inch phone jacks, accommodating a range of amplifier outputs. The SP 4BX is designed for users who need raw acoustic power and proven driver reliability from a passive cabinet—houses of worship, live music venues, outdoor events, and portable PA companies will find it a capable and durable option in the Peavey professional lineup.

Key Features

Quasi-three-way, full-range, bi-ampable sound reinforcement system

2000 watts program, 4000 watts peak

Two 15 inch BWX Black Widow 4 inch voice coil woofers

Sensitivity: 100 dB (1W/1m) anechoic

Full-range inputs include a Neutrik Speakon 4 pin jack and two 1/4 inch phone jacks

Specifications

Speaker Type
Passive
Woofers
2x 15" BWX Black Widow with 4" Voice Coil
HF Driver
RX 22
Program Power
2000 Watts
Peak Power
4000 Watts
Sensitivity
100 dB (1W/1m) Anechoic
Inputs
Neutrik Speakon 4-pin, 2x 1/4" Phone Jacks

Pros & Cons

👍 Pros

  • Dual 15-inch Black Widow woofers with 4-inch voice coils produce deep, powerful low-end and midrange output.
  • 4000 watts peak power handling allows the SP 4BX to perform at high volume levels in large venues.
  • 100 dB sensitivity rating means the speaker produces significant volume even with moderate amplifier power.
  • Both Speakon and 1/4-inch inputs provide flexible connection options for different amplifier setups.
  • Peavey Black Widow drivers are field-replaceable, simplifying maintenance and reducing long-term ownership costs.

👎 Cons

  • As a passive enclosure, it requires a separate power amplifier, adding cost and complexity to the setup.
  • The large dual-15-inch cabinet is heavy and bulky, making transport and setup physically demanding.
  • No built-in crossover details are specified, so users may need an external crossover or processor for optimal driver management.
  • The enclosure design is utilitarian and lacks modern cosmetic features found in some competing passive cabinets.
  • Single-enclosure coverage may be uneven in very large spaces without additional cabinets or delay speakers.

Frequently Asked Questions

The SP 4BX is a passive speaker enclosure. It requires an external power amplifier to operate and does not have a built-in amp.
The SP 4BX handles 2000 watts of program power and 4000 watts of peak power, so you need an amplifier capable of driving it within that range.
It accepts both Neutrik Speakon 4-pin connectors and two 1/4-inch phone jacks, giving you flexibility in how you connect your amplifier.
It contains two 15-inch BWX Black Widow woofers with 4-inch voice coils for low and mid frequencies, plus an RX 22 compression driver for high-frequency reproduction.
The SP 4BX has a sensitivity of 100 dB at 1 watt/1 meter (anechoic), which means it produces high output levels relative to the power fed into it.

Related Products