Wisdom Audio Sage L75 Line Source Speakers | The Grid HiFi
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Wisdom Audio Sage L75 Line Source Speakers | The Grid HiFi
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Overview
Wisdom Audio Sage Series L75 Line Source Loudspeaker
Free-Standing Line Source • 48" Planar Magnetic Array • Four 6" Woofers • 95 dB Planar Sensitivity • Active DSP Crossover
The Wisdom Audio Sage Series L75 is a high-performance free-standing line source loudspeaker designed for reference two-channel systems, media rooms and private cinemas. Its exceptionally slim enclosure combines a 48-inch planar magnetic line source with four high-output 6-inch woofers, delivering wide dynamic range and full-range performance from a speaker only 7.11 inches wide without its base. Wisdom Audio
48" Planar Magnetic Line Source
The L75 uses two 24-inch planar magnetic drivers to create a 48-inch line source. Wisdom's line source architecture reduces floor and ceiling reflections while maintaining more consistent sound pressure across distance, making it particularly effective in large rooms and multi-row theaters. Wisdom Audio
Four High-Output Woofers
Four proprietary 6-inch dynamic woofers provide bass extension to 40 Hz while maintaining the L75's narrow profile. The planar and woofer sections are independently driven through an outboard active crossover and DSP, requiring two channels of amplification per speaker. Wisdom Audio
Technical Specifications
| Specification | Details |
|---|---|
| Speaker Type | Free-Standing Line Source |
| Planar Magnetic Array | 48" Total, 2 × 24" Drivers |
| Woofers | 4 × 6" High-Output Drivers |
| Frequency Response | 40 Hz to 20 kHz ±2 dB |
| 30° Off-Axis Response | 40 Hz to 18 kHz ±2 dB |
| Planar Impedance | 4.5 Ω |
| Woofer Impedance | 3 Ω |
| Planar Sensitivity | 95 dB / 2.83V / 1m |
| Woofer Sensitivity | 91 dB / 2.83V / 1m |
| Crossover | Outboard Active |
| DSP | Required |
| Amplification | 2 Channels Required per Speaker |
| Dimensions with Base | 79.67" H × 17.83" W × 16" D |
| Dimensions without Base | 76.01" H × 7.11" W × 6.28" D |
| Shipping Weight | 79 lb Each |
| Base Shipping Weight | 30 lb per Pair |
| Customization | Custom Colors and Lengths Available |
Specifications are from Wisdom Audio's current L75 product data. Wisdom Audio
Wisdom Audio at The Grid HiFi
The Grid HiFi designs complete Wisdom Audio two-channel and private cinema systems, including speaker placement, DSP, amplification, subwoofers, acoustic treatment and system calibration.
Because the Sage L75 requires active DSP and dedicated amplification for its planar and woofer sections, proper system engineering is critical. The Grid can design and commission the complete system around the room rather than treating the L75 as a standalone loudspeaker.
Considering the Wisdom Audio Sage L75? Call The Grid HiFi at (713) 218-8120 to design your system.
FAQs
Please read our FAQs page to find out more.
Do you price match?
Yes. We match any authorised dealer, including big-box retailers. If you find the same product at a lower price, contact us and we'll match it.
Do you offer free shipping?
Yes — free shipping on every order, with 2-day delivery available on most products. Easy returns and exchanges are included.
Where is your showroom?
We're at 6362 Alder Drive, Houston, Texas. The showroom lets you hear and compare reference-level systems in person before making any decisions. If you're considering a larger purchase or installation, it's well worth the visit.
Can I buy online without visiting the showroom?
Yes. The full product range is available through the online store with free nationwide shipping. For more complex system builds, speaking with one of our advisers first tends to lead to a better result.
Do you offer financing?
Yes. Special financing is available through the BrandSource Credit Card for qualifying purchases, allowing you to spread payments over time with no annual fee. Promotional rebate savings are also available periodically. See the financing page for full details.
Do you install systems as well as sell equipment?
Yes — installation is central to what we do. We design and install whole-home audio and video, home theaters, media rooms, outdoor audio, lighting and motorised shades, and full smart home automation.
Do you provide support after installation?
Yes. We provide ongoing service and support to ensure systems continue performing as intended — not just on installation day, but over the long term.