13 REVIEWS
Compact powerful and highly tunable. The SUB 8.17 is the perfect choice for natural musical bass with outstanding precision and dynamics. Its also great for a smaller home cinema system. Designed as the successor to the popular 99W8.16 it builds upon its legacy with deeper bass greater control and enhanced flexibility.
Equipped with a high-speed ultra-light driver adapted from the acclaimed Cinema series and powered by a Class-D amplifier delivering 200W RMS (350W peak) the SUB 8.17 reaches all the way down to 29 Hz (-3 dB)while maintaining exceptional speed and accuracy.
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Class-D Amplifier with DSP Control
Great accuracy down to 29Hz
EQ & Custom Port Tuning for Room Matching
350W Peak Power for Explosive Dynamics
Cinema Series Driver for Extreme Precision
High Level input for amps without RCA out
The SUB 8.17 EDGE features a custom-engineered 8" long-stroke driver built on the same design principles as XTZ’s Cinema Series. A lightweight yet rigid cone, optimized suspension, and sealed motor structure deliver fast, controlled bass from a small enclosure—ideal for compact systems or secondary zones.
Lightweight long-fiber pulp cone
Provides speed and stiffness for clean bass transients.
Sealed motor with aluminum shorting ring
Reduces distortion and improves linearity under dynamic load.
KLIPPEL-optimized suspension
Designed for stability and full excursion with minimal compression.
The SUB 8.17 is powered by a 200W Class-D amplifier with 350W peak output. Its advanced DSP includes three EQ presets, precise signal routing, and high SNR for clean playback at all listening levels. Unlike many Class-D designs, the amplifier features near-ideal clipping behavior, minimizing distortion even at extreme output levels.
200W RMS / 350W peak output
Delivers headroom and dynamics for smaller setups.
DSP-based signal control
Includes EQ presets, high/low-level inputs, and adjustable settings via rear panel.
Gold-plated RCA and high-level inputs
Works even with amplifiers that don’t have line outputs.
The sealed cabinet is constructed from 25 mm MDF and internally braced for mechanical stability. With compact dimensions, low-reflective finish, and rounded edges, it integrates easily into tight spaces while preserving acoustic performance.
25 mm MDF with bracing
Provides a rigid, non-resonant structure for accurate bass.
Damped and sealed enclosure
Minimizes vibration and coloration from internal reflections.
Compact footprint with matte finish
Ideal for placement near walls, furniture, or inside furniture cavities.
Despite its compact size, the SUB 8.17 offers a full suite of tuning options. Use the three built-in EQ presets and flexible port tuning to adjust for room acoustics, placement, and playback preferences.
EQ presets and PEQ tools
Adapt the output for room size, system voicing, or use case.
Port tuning flexibility
Configure sealed or vented operation to prioritize punch, depth, or control.
Adjustable crossover and phase
Rear panel controls allow integration into a wide range of setups.
Use the three built-in EQ presets to quickly adjust the bass character. Each mode alters the sub’s extension, balance, and energy distribution.
REF
Deepest extension; best for full-range playback in larger or well-treated rooms.
EQ1
Reduces deep bass to control gain effects from walls or corners.
EQ2
Adds upper bass energy for more impact and rhythm.
Port Tuning - High frequency
With no plugs in the ports the subwoofer will provide a “quick” and “punchy” bass character. It will produce increased output higher up in the frequency range.
Port Tuning - Mid. frequency
If the left port is blocked and the right port is open, this will provide a bass with an increased output in the mid-region.
Port Tuning - Low. frequency
If the right port is blocked and the left port is open, this will provide a deep bass with an increased output in the lower frequencies.
Both ports closed
With both ports blocked the sealed box will provide a dry and controlled bass character.
4.85 / 5
The 8.17 is a really great subwoofer for the price and size. I use it for my 16sqm living room and it creates exactly the bass that I want powerfull but still controlled. It fits perfectly to my bookshelf speakers! The only small thing I do not like is the white cover which makes the drivers shine through.
I run the sub with the 95.22 as a 5.1 system with a Denon AVR 1912. At first I was concerned that the 8.17 is too small and can never produce a decent bass. After installing I was really astonished. Not only audible but also palpable bass is generated in my 18sqm living room (with laminate floor). When fully turning up the volume the 8.17 reaches its limits and begins to roar so those who want a brutal and extremely loud subwoofer and do not live in a rented apartment should look for larger subwoofer. Conclusion: For me the Sub 8.17 was the perfect choice. With music and movies a precise and tactile bass is produced and the price is just great!
Ive bought two 8.17 subwoofers mainly for stereo. They acompany my Kef LS50 W Active speakers. So now I have a complete active full range stereo setup. These little subwoofers are wonderfull.. they are powerfull and go as deep as 29 Hz in my 45 square meters room. I use Roon DSP for room correction (measured with REW) and add a housecurve with the KEF DSP. Crossovers are set internal in the Kef DSP 80 hz for the Kef and 85 Hz for the 8.17 Now I have a powerfull clean and detailed bass and because the Kefs doesnt have to play the deepest bass they sound clean and fast in the midrange and highs. Thank you XTZ for these fantastic little subwoofers. Ill hope XTZ one day will do active dsp speakers too.. the 99.25 maybe
XTZ sells directly to you without any middlemen. This means you get more of everything for your money: better components, better design, better engineering and as a result, a speaker to be proud of.
We are fully aware that a speaker reflects the character of the environment that it is in. As such, we offer a refund within 30 days if you are not satisfied with your purchase (see terms below).
