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    • Home  / Product Manuals & Documentation
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    OEM Systems Presence — In-Wall & In-Ceiling Loudspeaker Line Brochure

    September 08, 2026 3 min read

    Product brochure for the OEM Systems "Presence" line of Lifetime-Warranty In-Wall and In-Ceiling home theater loudspeakers — full model lineup and specifications.

    💾 Download Original PDF
    Full text manual (for reference)

    Product brochure for the OEM Systems "Presence" line of In-Wall and In-Ceiling home theater loudspeakers. Presence is OEM Systems' signature line, backed by a Lifetime Warranty, using Kevlar-woven-fiber woofers, butyl rubber surrounds, ferro-fluid cooled silk dome tweeters/midranges, fiberglass crossover PC boards, oxygen-free copper wiring, and gold-plated connection terminals.

    Design Highlights

    • In-Wall models use Phase Plug technology to keep the midrange clean and minimize phase disturbances at the center of the mid-woofer.
    • Pivoting dome midrange and tweeter drivers (woven silk/textile) are open and transparent-sounding, and — due to their design — don't require diffraction-contributing lenses common on many high-frequency drivers.
    • In-Ceiling models use pole-mounted, pivoting (lens-less) dome tweeters rather than bridge-mounted tweeters, avoiding diffraction distortion in front of the mid-woofer.

    Model Lineup & Specifications

    Model Type Freq. Response Power (nom/max) Sensitivity Overall Dimensions / Cut-out
    A-525 5-1/4" 2-way rectangular 50 Hz - 20 kHz 40W / 80W 91dB 6-3/4"W x 9-3/8"H; cut-out 5-1/2"W x 8-3/16"H x 2-3/8" deep
    A-505 5-1/4" 2-way round 50 Hz - 20 kHz 40W / 80W 91dB 7-1/2" round; cut-out 6-1/2" round x 2-3/8" deep
    A-LCRS Dual 5-1/4" 2-way MTM center/all-channel 45 Hz - 20 kHz 50W / 100W 91dB 9"x15-3/4"; cut-out 7-7/8"x14-7/16"x3-1/2" deep
    A-525 CC Dual 5-1/4" 2-way MTM center/all-channel 80 Hz - 20 kHz 60W / 120W 89dB 18-5/16"W x 6-11/16"H x 6-5/8" deep
    A-650 6-1/2" 2-way rectangular 45 Hz - 20 kHz 50W / 100W 91dB 9-1/16"W x 12-3/4"H; cut-out 8"W x 11-3/4"H x 3-1/4" deep
    A-606 6-1/2" 2-way round 45 Hz - 20 kHz 50W / 100W 91dB 8-3/8" round; cut-out 7-3/8" round x 2-7/8" deep
    A-6LCRS 6-1/2" 2-way round, 15° angled 45 Hz - 20 kHz 50W / 100W 91dB 10-3/4" round; cut-out 9-1/4" round x 5" deep
    A-820 8" 2-way rectangular 35 Hz - 20 kHz 60W / 120W 91dB 10-1/2"W x 14-1/2"H; cut-out 9"W x 13"H x 3-1/4" deep
    A-808 8" 2-way round 35 Hz - 20 kHz 60W / 120W 91dB 9-3/4" round; cut-out 8-5/8" round x 3-3/8" deep
    A-8LCRS 8" 2-way round, 15° angled 35 Hz - 20 kHz 60W / 120W 91dB 12-7/8" round; cut-out 11-1/2" round x 5-3/4" deep
    A-830 8" 3-way rectangular, mirror-imaged pairs 35 Hz - 20 kHz 60W / 120W 91dB 10-1/2"W x 14-1/2"H; cut-out 9"W x 13"H x 3-1/4" deep
    A-SP6 6-1/2" 2-way round, single-point stereo 45 Hz - 20 kHz 50W combined both channels 91dB 8-3/8" round; cut-out 7-3/8" round x 2-7/8" deep
    A-SP8 8" 2-way round, single-point stereo 35 Hz - 20 kHz 60W combined both channels 91dB 9-3/4" round; cut-out 8-5/8" round x 3-3/8" deep
    C-10SW 10" round in-ceiling subwoofer (looks identical to A-8LCRS with grille) 25 - 200 Hz 150W program 88dB 12-7/8" round; cut-out 11-1/2" round x 4-5/8" deep; requires MB-C10 bracket
    A-120 Freestanding 12" 300W powered subwoofer, extra long-throw driver 28 Hz - 300 Hz 0-300W output level — 15-3/8"W x 17-5/16"H x 14-3/4" deep

    Powered Subwoofer Controls (A-120)

    • Output Level: continuously variable 0-300W
    • Frequency Response: 28Hz – 300Hz
    • Crossover Frequency: continuously variable 40Hz – 120Hz
    • Phase: continuously variable 0 – 180 degrees
    • Stereo Inputs: Line Level, LFE, Speaker Level

    Mounting Options

    All-channel/center models (A-LCRS, A-525 CC, A-6LCRS, A-8LCRS) are magnetically shielded and orient vertically or horizontally. 15°-angled models (A-6LCRS, A-8LCRS) enable enhanced cinematic sound imaging where room layout requires ceiling-mounted speakers.

    Pre-construction brackets (for framing before drywall) are available for most models, including versions with an integrated Vapor Dome moisture barrier: RI-6914, RIR-5, VPD-5, RIB-LCR, RIR-615, RIB-62, RIR-6, VPD-6, RIB-82, RIR-8, VPD-82, VPD-8, RIR-815, MB-C10 (required for C-10SW).

    Warranty

    Lifetime Warranty on all Presence loudspeakers, subwoofers, and powered subwoofers.