PSB CS850 8" In-Ceiling Speaker

PSB CS850 8" In-Ceiling Speaker at Vinyl Sound Buffalo NY

The PSB CS850 is an in-ceiling speaker built around an 8-inch carbon-filled polypropylene cone woofer with a stamped steel basket and foam surround, paired with a 1-inch ferrofluid-cooled titanium dome tweeter with an indexed wave guide, delivering a frequency response of 45Hz to 20,000Hz (±3dB) at 86dB anechoic sensitivity into a nominal 8-ohm load. Available at Vinyl Sound in Buffalo, New York, the CS850 is a flat-baffle in-ceiling speaker whose tweeter wave guide rotates on an indexed axis for listener-directed high-frequency aim — providing precision aiming of the tweeter's on-axis response independently of the fixed woofer orientation. A 3,100Hz Linkwitz-Riley 4th-order (LR4) crossover transitions between the woofer and tweeter with a 24dB per octave rolloff slope, providing a smooth, coherent combined response across the crossover frequency. Dual-position EQ switches for tweeter and woofer levels allow on-site acoustic calibration. The open-back design uses the ceiling plenum as the acoustic chamber. Both round (10⅝" diameter) and square magnetic frameless grilles are included. The CS850 is part of Vinyl Sound Buffalo's full speaker collection, which includes in-ceiling, in-wall, outdoor, powered, and floorstanding speakers from leading audio brands.

8" Woofer, LR4 Crossover, and Indexed Wave Guide Tweeter

The CS850's 8-inch woofer provides approximately 54% more cone area than a 6.5-inch driver, which translates directly to greater air displacement capability and deeper bass extension at equivalent excursion levels. The carbon-filled polypropylene cone increases stiffness and internal damping compared to standard polypropylene, reducing midrange cone resonances that would otherwise color the speaker's response in the 300Hz–1kHz range where both music instruments and film dialogue occupy most of their tonal energy. The foam surround provides a compliant, low-hysteresis suspension appropriate for the woofer's relatively high crossover point of 3,100Hz — the LR4 crossover passes the woofer signal to the tweeter at a frequency where the 8-inch driver's upper-range behavior is already rolled off at 24dB per octave, preventing tweeter-range cone breakup from reaching the listener. The titanium dome tweeter's indexed wave guide rotates independently of the woofer baffle, allowing the tweeter's high-frequency axis to be aimed toward the seating area after the speaker is flush-mounted in the ceiling.

EQ Switches, Open-Back Design, and Grille Options

The CS850's dual-position tweeter and woofer level switches are accessible from the front of the speaker after grille removal, providing individual boost or cut for each driver to compensate for room-specific boundary conditions and listener distance. The open-back design installs without a dedicated rear enclosure, using the ceiling plenum cavity behind the cutout as the woofer's acoustic loading environment. At 3.25 lb (1.47 kg) per speaker, the CS850 is light enough for single-person ceiling installation without a second person supporting the speaker from below during dogleg deployment. The heavy-duty doglegs clamp the speaker to ceiling drywall from the front without requiring above-ceiling access. Both a round grille (10⅝" diameter) and a square grille are included in the box — both frameless and magnetic, attaching and detaching without visible screw holes or frame borders. The same 9¾-inch (245mm) round mounting cutout accepts both grille shapes.

Specifications

Frequently Asked Questions

How does the PSB CS850 compare to the CS AIC 860?

The CS850 uses a larger 8-inch woofer with a 3,100Hz LR4 crossover and standard flat baffle, while the CS AIC 860 uses a 6.5-inch woofer on an angled baffle that tilts the woofer toward the listening position. Both share the same 9¾-inch round mounting cutout, 86dB sensitivity, 8-ohm nominal impedance, and 10–100 watt power range. The CS850 extends bass 3Hz lower (45Hz vs 48Hz at ±3dB), is lighter (3.25 lb vs 5.15 lb), and includes both round and square grilles in the box. The CS AIC 860 adds an angled woofer baffle for better directional bass localization, a rubber rather than foam woofer surround, and support for an optional acoustic backbox for fire-rated ceiling installations. Choose the CS850 for its larger woofer and deeper bass; choose the AIC 860 where angled baffle directivity or backbox compatibility are required.

What does the 3,100Hz LR4 crossover mean?

The crossover in the CS850 transitions audio signal from the 8-inch woofer to the 1-inch tweeter at 3,100Hz using a Linkwitz-Riley 4th-order network. At this frequency, the woofer and tweeter each receive a 24dB per octave rolloff on their respective signals, so the combined output of the two drivers produces a flat response through the crossover region without the 3dB peak at the crossover frequency that simpler 2nd-order or acoustic crossover designs exhibit. A 3,100Hz crossover is higher than typical for an 8-inch woofer (many 8-inch two-way speakers cross at 2–2.5kHz), which keeps the tweeter above most of the energy range where intermodulation distortion from high-level bass signal would stress a smaller tweeter dome. It also means the 8-inch woofer handles the full range of vocal and instrumental midrange content below 3,100Hz, where its larger cone area provides good efficiency and output.

What do the EQ switches on the CS850 do?

The CS850 provides two separate dual-position level switches — one for the tweeter and one for the woofer — accessible from the front after grille removal. These allow the installer to apply a level adjustment at each driver independently to compensate for acoustic conditions specific to the installation. Tweeter level reduction is commonly applied in rooms with hard reflective ceiling materials (tile, plaster, or glass near the speaker) that emphasize high frequencies at the listening position. Woofer level reduction compensates for bass buildup when the speaker is installed close to a wall-ceiling junction where boundary reinforcement adds bass level. Having separate switches for each driver provides more precise tonal balance adjustment than a single global EQ trim control that adjusts both drivers together.

Is the CS850 baffle angled like the CS AIC 860?

No. The CS850 uses a flat baffle — the woofer fires straight downward from the ceiling surface rather than at an angle toward the listening position. The tweeter's wave guide rotates on an indexed axis to aim the high-frequency acoustic axis toward the listener, which provides some improvement in on-axis high-frequency delivery at the seated listener compared to a fixed flat-baffle tweeter. However, the woofer's midrange output (below 3,100Hz) is not steered by the tweeter adjustment. The CS AIC 860 uses an angled baffle that tilts both the tweeter and woofer toward the listening position, which provides more comprehensive directional improvement across the full frequency range. For home theater center channel or surround applications where driver-level directional aim is a priority, the CS AIC 860's angled baffle offers a technical advantage over the CS850's adjustable-tweeter flat baffle approach.

Do I need a back box for the CS850?

The CS850 is an open-back design that uses the ceiling plenum as the acoustic chamber — a back box is not listed as an accessory option for the CS850 (unlike the CS AIC 860, which offers an optional acoustic backbox). For most residential drywall ceiling installations with adequate plenum depth, the open-back design delivers the specified 45Hz–20,000Hz frequency response using the available ceiling cavity volume. If the installation site requires a fire-rated ceiling assembly where the plenum must be acoustically sealed, consult with PSB or your installer about compliance options, as the open-back configuration may not satisfy local fire code requirements for penetrations in rated ceiling assemblies without additional sealing measures.

What amplifier power does the CS850 need?

The CS850 operates across a wide recommended power range of 10–100 watts into its nominal 8-ohm load with a 6-ohm minimum impedance. The 86dB anechoic sensitivity means a 50-watt per channel AV receiver will produce approximately 103dB at one meter under sustained conditions — more than enough for typical home theater ceiling-to-floor listening distances. At the low end, even a 10-watt receiver channel will produce around 96dB at one meter, adequate for moderate background music volume in smaller rooms. For multi-zone commercial or whole-home audio installations, the 8-ohm nominal impedance is compatible with standard multi-room matrix amplifiers without impedance-related driver stress.

Where to buy PSB CS850 in-ceiling speakers in Buffalo NY?

The PSB CS850 is available from Vinyl Sound, an authorized PSB Speakers dealer in Buffalo, New York. Vinyl Sound also carries the CS AIC 860 angled in-ceiling speaker and the C-LCR and W-LCR architectural speakers for comparison across PSB's in-ceiling and in-wall range. Free shipping is available across the continental United States. Contact Vinyl Sound Buffalo by phone or email to purchase the CS850 or discuss which architectural speaker best suits your ceiling installation and room requirements.