The Q Acoustics QI65SP is the square-grille variant of the QI65P Performance in-ceiling speaker from Q Acoustics' Q Install range. Sitting above the entry-level QI65ST and alongside the circular-grille QI65CP, the QI65P series delivers a step up in sonic refinement for whole-home audio and multi-room installations where sound quality matters as much as visual discretion.
Driver Configuration & Crossover
The QI65SP pairs a 165mm woofer with a 25mm (1-inch) swivel tweeter, allowing the high-frequency output to be aimed towards the primary listening position after installation. A crossover-mounted HF adjustment switch provides ±3dB of treble control, enabling fine-tuning to suit different room acoustics and ceiling heights without the need for external equalisation.
Installation & Construction
Designed for straightforward retrofit and new-build installations, the QI65SP requires a 203mm ceiling cutout and sits just 79mm deep behind the ceiling surface. Four front-mounted clamps secure the speaker from below, eliminating the need for rear access during fitting. Push-open speaker terminals allow single-handed cable connections, and an installation template with cutter guide is included.
The magnetic grille system clips into place without visible fixings, delivering a clean, flush finish. The square grille option suits rooms with angular design cues where a circular grille might look out of place.
Moisture Resistance & Safety
The QI65SP's housing is moisture-proof and constructed from UL94 flame-retardant materials, making it suitable for installation in kitchens and other moisture-prone areas where conventional speakers would be at risk.
| Speaker Type | In-Ceiling |
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| Woofer | 165mm (6.5") |
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| Tweeter | 25mm (1") swivel |
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| Impedance | 8 ohms nominal |
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| Power Handling | 15–80W (programme) |
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| Sensitivity | 90 dB SPL (2.83V, 1m) |
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| HF Adjustment | ±3dB switchable |
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| Low Frequency Extension | 70Hz (−3dB) |
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| Cutout Size | 203mm |
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| Grille Size | 232mm (square) |
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| Maximum Depth | 79mm |
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| Grille Type | Magnetic, square |
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| Construction | UL94 flame retardant, moisture-proof |
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| Connections | Push-open speaker terminals |
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| Included Accessories | Installation template, cutter guide, fitting instructions |
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| Also Available As | Circular grille (QI65CP) |
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