JBL Synthesis SDEC-4500P 12-Channel Fully-Balanced Digital Equalizer

JBL Synthesis SDEC-4500P 12-Channel Digital Equalizer Overview

With the Synthesis surround system – a direct descendant of the Pro Cinema industrial line – JBL redefines the home cinematic experience. And a key portion of that experience is fine-tuning your electronics to match your speakers, and the speakers to match your listening environment. That’s where the ultra-sophisticated SDEC-4500P comes in. This 12-channel digital equalizer, designed for custom integration into the JBL Synthesis source-to-speakers system, offers more than 500 bands of equalization, for the most exacting frequency adjustments. And those bands are parametric – meaning their center frequencies and bandwidths are infinitely customizable. Combined with similarly sophisticated Synthesis components such as the SDP-75 digital surround processor and the SDA 4600 multichannel amplifier, and tuned to Synthesis speaker systems such as the SCL-2, 3 and 4 in-wall units, the SDEC optimizes sound to surroundings to a degree unattainable in most other systems. Professionally installed and customized to your space and taste, the SDEC-4500P and the entire Synthesis system can transport you well beyond your walls, to any venue or world you wish to inhabit.

Product Information

Product highlights

  • Active two-way crossover for bi-amplification of front/center speakers
  • Four low-pass filters for active management of subwoofers
  • Auto Curve Sum for optimization of subwoofers with mains
  • 500-bands-plus of parametric digital equalization
  • Phase filters and time-delay correction for listening positions
  • Engineered to match JBL custom Synthesis speaker line
  • Sound-field management when used with JBL calibration system
  • Dimensions: 3.5" high x 19" wide x 9.25" deep
  • Weight: 13 lbs.
  • Warranty: 5 years – World Wide Stereo is an authorized dealer for every brand we sell
  • Included: World Wide Stereo 60-day guarantee and expert product support

An expert eye

A system as complex as the Synthesis demands precision setup and adjustment. That’s why JBL strongly suggests, and we at World Wide concur, that the equalizer – an integral link in the full Synthesis system – be installed and tuned to your home environment, as customized by a certified professional and calibrated with JBL’s pro software. Multiple measurements made with microphone arrays at each listening position in the room will guarantee that every seat in your theater will be the best seat in the house.

Ultra-sophisticated correction

Home-theater enthusiasts are familiar with the many flavors of automatic optimization offered by today’s top surround receivers. But the Synthesis SDEC-4500P goes far beyond. More than 500 bands, each adjustable for center frequency and bandwidth, mean unparalleled control of sound reproduction in any environment. And, as an integrated component in the Synthesis system, the SDEC starts with an unbeatable advantage: It knows what speakers you’re using, and is preprogrammed with their intrinsic characteristics. So it can precisely fine-tune the phase, amplitude and frequency response for nearly every listening position in your room.

Seamless subwoofer synergy

Specifically built for bass management, the SDEC-4500P controls the integration of up to four subwoofer channels with the overall environment, seamlessly blending the ultra-lows with the entire surround speaker setup into a single superior experience.

Listen and be amazed

Words fail when describing the Synthesis system. That’s why we at World Wide urge you to stop by if you’re in the neighborhood of our Ardmore, PA showroom, for a theatrical demonstration of the full JBL Synthesis system. It’s guaranteed to leave you breathless. And as always, you can count on our unmatched product support and 60-day guarantee.

WWS: What we say

“It’s a different experience. There’s watching television, there’s going to the movie theaters, then watching theater in a JBL Synthesis room is the next level up. It’s that much of a difference, better than a theater by far.” – Robert Marcoccia, World Wide Stereo Ardmore Sales & Systems Designer

Prop 65 Warning

WARNING: California Residents - Proposition 65. This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.



  • Frequency response: 20Hz - 20kHz (+0.5/-1dB)
  • THD: <0.01% (20Hz - 20kHz, +10DBU output)
  • Dynamic range: 108dB typical (22Hz - 22kHz unweighted)
  • Power requirements: 85 - 270V AC, 50/60Hz, line voltage set for destination country
  • Power consumption: <35VA
  • Dimensions (H x W x D): 3.5" x 19" x 9.25"
  • Weight: 13 lbs.

What's in the Box

What's in the Box:

  • SDEC-4500P 12-Channel Fully-Balanced Digital Equalizer
  • Manual



Customer Reviews for JBL Synthesis SDEC-4500P 12-Channel Fully-Balanced Digital Equalizer

There are no reviews for this item. Write Review


Customer Q & A

Have a functionality, compatibility, or otherwise product-specific question about this product? Ask it here! If you have a customer service or shipping question, please direct it to our customer service department

Start typing your question and we'll check if it was already asked and answered. Learn More
No questions have been asked about this item. Be the first!
Prop 65 Warning

WARNING: California Residents - Proposition 65. This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.