Most loudspeakers approaching $20,000 per pair arrive fully assembled in wooden crates.
The PureAudioProject Quartet15 arrives flat-packed and expects the buyer to locate an Allen key. Depending on your personality, that is either refreshing involvement or a very expensive way to spend Saturday afternoon.
The three-way open-baffle loudspeaker will make its public debut this weekend at Southwest Audio Fest 2026, running July 23 through July 25 at the Sheraton Dallas Hotel. PureAudioProject will demonstrate the Quartet15 in Room 736 with Western HiFi and Silversmith Audio.
Four Paper Drivers and No Box
Each Quartet15 uses:
- Two proprietary 15-inch paper-cone woofers developed with Eminence
- One custom 10-inch paper-cone midwoofer
- One 5-inch Voxativ AF 2.6 wide-range driver
PureAudioProject says using paper diaphragms throughout helps the drivers sound more consistent as music moves from bass through the midrange and into the upper frequencies.
That sounds reasonable on paper—quite literally—but the real question is whether four large drivers blend into one coherent loudspeaker rather than sounding like several excellent ideas sharing the same frame.
Because there is no conventional cabinet, the rear radiation remains part of the presentation. Open-baffle designs can produce a large, spacious soundstage with less enclosure coloration, but they need room to breathe.
PureAudioProject recommends placing the Quartet15 2 to 3.5 feet (60 to 106 cm) from the wall behind it. Buyers hoping to push them against the wall beside a media console should probably keep scrolling.
Modular Mundorf Crossover
The Quartet15 uses PureAudioProject’s first-order Thrier crossover with Mundorf MCAP EVO Silver Gold Oil capacitors and MRES20 resistors.
The network remains exposed and uses screw terminals, allowing owners to change components or values without soldering or reaching through a woofer opening with the optimism of someone who has already made a mistake.
That flexibility is one of the speaker’s real differentiators. It also means the Quartet15 will appeal more to listeners who enjoy tuning and understanding their systems than buyers who want the loudspeaker delivered, positioned and never touched again.
High Sensitivity and Amplifier Matching
PureAudioProject quotes sensitivity above 96dB, an 8-ohm nominal impedance and bass extension between approximately 29 and 32Hz.
That makes the Quartet15 a logical partner for:
- 300B and 845 single-ended tube amplifiers
- EL34 or KT88 push-pull designs
- Low-to-moderate-power Class A amplifiers
- First Watt and similar high-quality solid-state designs
- Higher-powered amplifiers with excellent low-level control
The Dallas system will use Opera Consonance Reference 5.5i MkII and Linear 845 integrated amplifiers, rated at approximately 18 and 28 watts.
High sensitivity does not mean amplifier quality stops mattering, nor does it guarantee that every two-watt flea-powered amplifier will control four large paper cones in a large room. The Quartet15 should not require enormous output, but bass grip and the quality of the first few watts will matter.
Assembly Required
The Quartet15 is sold directly by PureAudioProject and ships in several flat-packed cartons.
Assembly requires an Allen key and screwdriver, while buyers can select baffles made from colored MDF, Valchromat HDF, bamboo, American walnut, oak or maple.
Each speaker weighs at least 79 pounds (36 kg) depending on the selected material. PureAudioProject has not yet published complete external dimensions, which is a fairly important omission for something using two 15-inch woofers and demanding several feet of breathing room.
Who Is It For?
The Quartet15 is for listeners with medium-to-large rooms who want scale, efficiency and the spacious presentation of an open-baffle design. It also makes sense for owners of quality tube amplifiers or low-power Class A solid-state designs who do not want to surrender dynamics.
It is not for small rooms, wall-hugging installations or anyone who believes spending nearly $20,000 should eliminate the need to assemble furniture.
The Bottom Line
The PureAudioProject Quartet15 is not merely another large floorstander. Its dual 15-inch woofers, dedicated midwoofer, Voxativ driver, high sensitivity and accessible crossover create something unusually flexible for listeners who want to participate in the final setup.
The concept is compelling, particularly for tube-amplifier owners who want large-scale dynamics without 300 watts per channel.
The pricing remains less tidy. PureAudioProject’s earlier announcement listed the Quartet15 from $19,500 per pair, while more recent show information suggests some configurations may begin around $18,000. The final cost depends on the baffle and crossover options, and the company needs to publish a clear base price.
For more information: pureaudioproject.com
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