Dolby System 128 – Screen Channel Speaker System
Dolby System 128 – Screen Channel Speaker System is backordered and will ship as soon as it is back in stock.
Dolby System 128 – Screen Channel Speaker System
What is the Dolby System 128?
The Dolby System 128 is a bi-amplified screen channel speaker system for medium-sized immersive cinema auditoriums. It stacks one CS128MH mid/high loudspeaker on one CS128LF low-frequency loudspeaker. A patented asymmetrical waveguide, 75 mm titanium dome HF driver and two 15-inch woofers deliver 39 Hz to 20 kHz response with 131 dB maximum summed continuous SPL.
How does the Dolby System 128 work?
The System 128 is bi-amplified: the cinema processor sends separate mid/high and low-frequency feeds to two amplifier channels, one for the CS128MH and one for the CS128LF. The CS128MH contains a passive crossover between its 12-inch woofer and titanium dome, so the stack needs a minimum of two amplifier channels.
The CS128MH's asymmetrical waveguide spans 60° at the top and 120° at the bottom horizontally, with 60° vertical, so the rear of the room gets more level while front rows get wider, softer coverage. Its 12-inch driver uses an aluminum demodulation ring to reduce distortion. The CS128LF holds two 15-inch woofers in independent chambers that run in parallel at 4 ohms or individually at 8 ohms through a flip-card input, rated at 600 W @ 49 Vrms.
At 13.4 inches (340 mm) deep with laterally mounted input plates, the stack suits tight screen walls. Drive it from a Dolby CP950A or CP950 with Dolby Multichannel Amplifiers such as the DMA24302.
What are the key features of the Dolby System 128?
- Patented asymmetrical waveguide — 60° top / 120° bottom horizontal coverage provides even volume shading.
- 75 mm titanium dome HF driver — low-distortion response up to 20 kHz.
- 12-inch MF driver with demodulation ring — cooling-optimized motor and aluminum ring reduce distortion.
- Dual 15-inch LF section — the CS128LF flip card selects parallel or independent drive.
- Shallow 13.4-inch depth — laterally mounted input plates simplify installation and service.
- Built-in handles — tuned port cutouts double as handles during unpacking and installation.
Where is the Dolby System 128 typically used?
- Cinema auditorium (medium)
- Screening room
- Auditorium
- House of worship
- Multi-purpose room
Technical Specifications
| Components | (1) CS128MH mid/high, (1) CS128LF low-frequency |
| Frequency range | 39 Hz - 20 kHz |
| Usable LF response | 32 Hz |
| CS128MH coverage (asymmetrical) | 60° top H, 120° bottom H, 60° V |
| Rated impedance | CS128MH: 8 Ohms; CS128LF: 4 Ohms parallel / 8 Ohms x 2 (independent) |
| Sensitivity @ 1 W | CS128MH: 101 dB; CS128LF: 101 dB |
| Power handling | CS128MH: 300 W @ 49 Vrms; CS128LF: 600 W @ 49 Vrms |
| Max continuous SPL @ 1 m | CS128MH: 126 dB; CS128LF: 129 dB; system summed: 131 dB |
| Input | Advanced input plates w/ high-current spring-loaded terminal blocks (LF with flip card) |
| Enclosure | Wood |
| Accessories | BKT.FLR floor bracket kit (sold separately) |
| Dimensions | 70.80" H x 32.74" W x 13.4" D (179.8 x 83.2 x 34 cm) |
| Weight (system stack) | 186 lb (84.37 kg) |
Frequently Asked Questions
What makes up the System 128?
One CS128MH mid/high speaker and one CS128LF low-frequency speaker. Dolby also lists each as a separate product for replacements or custom layouts.
How many amplifier channels does it need?
At least two: one for the CS128MH, which has an internal passive crossover, and one for the CS128LF. The CS128LF can also be split across two channels in independent mode.
Is the System 128 compatible with Dolby Atmos and the CP950A?
Yes. It is part of Dolby's immersive screen speaker line and runs from processors such as the CP950A with Dolby Multichannel Amplifiers.
How does it differ from the System 126?
System 128 uses the larger CS128MH with a 12-inch woofer and 75 mm titanium dome for 131 dB summed output, while System 126 uses the CS126MH and can run passively on one channel with the PXO.126.
What warranty and support come with it?
The System 128 carries Dolby's manufacturer warranty, confirmed with your quote. Creation Networks designs, installs and tunes Dolby screen systems; see the Dolby Professional collection and request a quote.
At Creation Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
Nationwide Audiovisual Services, Design, Installation & Support
Creation Networks is a trusted nationwide partner for complete audiovisual solutions — delivering expert AV system sales, professional design, programming, installation, and ongoing support to organizations across the United States.
From Microsoft Teams Rooms and enterprise video conferencing to LED video walls, live streaming production, and hybrid collaboration systems, we provide end-to-end AV integration using premium, certified technology from industry leaders including Crestron, Q-SYS, Shure, Extron, and Absen.
Whether you operate a single location or manage facilities nationwide, Creation Networks ensures your AV systems are designed for reliability, scalability, security, and long-term performance — helping your organization communicate more effectively and operate at peak efficiency.
CREATION NETWORKS — A PARTNER YOU CAN TRUST SINCE 2006
