Zu Audio
Undertone 3
The Undertone 3 (Mk.III) is a down-firing, sealed 12-inch subwoofer hand-built in small batches by Zu Audio in Ogden, Utah, a boutique speaker and cable maker known for USA-made, direct-order products sold through a limited dealer network. It was reviewed favorably by Positive Feedback, whose reviewer called the Undertone "the best subwoofer I have ever heard," and it carries a sustained reputation among 2-channel audiophile forums for integrating cleanly with high-efficiency speakers (Positive Feedback review, Zu Audio product page).
MSRP
$2,999
Used market · Good
$2,425
MSRP to used market
From $2,999 at launch to $2,425 today.
Specifications
- Price
- From $2,999.00
- Inputs
- RCA line-level (L/R summing), RCA sub line-level, 5-way binding post speaker-level
- Weight
- 68 lbs each
- Dimensions
- Height (with spikes) 25″; footprint 15″ × 15″
- Enclosure type
- Down-firing, sealed subwoofer system with active signal processing
- Amplifier power
- Hypex UCD 400W (Zu Subwoofer Plate Amp Mk.III)
- Production status
- Mk.III version shipping since fall 2022; predecessor Mk.II retailed at $2,899
- Frequency response
- 14–80 Hz
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