Wie viel Leistung hat die NuPrime STA-9X?

Im Stereo-Betrieb liefert die STA-9X 2 × 130 W an 8 und 4 Ω. Per Schalter gebrückt arbeitet sie als Mono-Endstufe mit 330 W. Das reicht für die allermeisten Lautsprecher deutlich aus; für besonders stromhungrige Boxen lassen sich zwei Geräte als Monoblock-Paar kombinieren.

Kann ich zwei STA-9X als Mono-Endstufen betreiben?

Ja. Jede STA-9X lässt sich per Schalter in den Mono-Modus brücken und liefert dann 330 W. Mit zwei Geräten betreibst du je einen Lautsprecher mit einer eigenen Endstufe – das verbessert Kanaltrennung, Kontrolle und räumliche Abbildung spürbar. Ein sauberer, stufenweiser Upgrade-Pfad.

Brauche ich eine Vorstufe für die STA-9X?

Ja. Die STA-9X ist eine reine Endstufe ohne Lautstärkeregelung. Du brauchst eine Vorstufe oder einen Vollverstärker mit Pre-Out. Gut kombinierbar ist sie zum Beispiel mit einer NuPrime-Vorstufe oder einem DAC mit Lautstärkeregelung. Wir helfen dir beim passenden Match.

Passt die STA-9X klanglich zu meinen Lautsprechern?

Die STA-9X klingt schnell, neutral und kontrolliert – sie belohnt präzise, dynamische Lautsprecher. Eine Röhrenwärme liefert sie bewusst nicht. Ob sie zu deinen Boxen, deinem Raum und deinem Hörgeschmack passt, schätzen wir gern mit dir gemeinsam ab.

Warum die NuPrime STA-9X bei HD Zürisee kaufen?

Weil wir wissen, mit welchen Vorstufen und Lautsprechern die STA-9X aufblüht – und das aus der Praxis, nicht nur vom Datenblatt. Du bekommst persönliche Beratung von Andy und Maurizio, Service über unseren eigenen Techniker und Unterstützung bei Einrichtung und Mono-Upgrade. Erreichbar telefonisch, per WhatsApp oder in Wädenswil.

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NuPrime STA-9X Stereo Power Amplifier, Silver

CHF 1'199.00

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Taxes included. Free shipping from CHF 190.–

Ab Lieferantenlager verfügbar – in der Regel 1–3 Tage

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The NuPrime STA-9X is a compact stereo power amplifier in Class-A+D technology that can be switched to bridge into a powerful mono power amp.

It gets a lot of control out of very little footprint: 2 × 130 watts, 330 watts in mono mode, from a chassis that fits comfortably next to the router. If you believe a serious power amp has to weigh like an anvil, it's time to think again.

Why the STA-9X?

The STA-9X combines a Class-A input stage with a Class-D output stage and runs at a switching frequency of 750 kHz – roughly double that of many other Class-D designs. That keeps distortion well away from the audible range and delivers a fast, clear, cool-running performance. It stays quiet and unfussed in operation – three qualities you'd want from a good relationship too.

What you get

✅ 2 × 130 W, mono 330 W: Stereo into 8 and 4 Ω, or switched and bridged as a mono power amp with considerably more shove.
✅ Class-A+D at 750 kHz: The high switching frequency pushes typical Class-D distortion out of the audible range – fast transients, clear top end.
✅ XLR and RCA: Balanced and unbalanced input, matching practically any preamp.
✅ Mono-capable for later: Stereo today, add a second unit tomorrow – two STA-9X units make a genuine monoblock pair.
✅ 12 V trigger on/off: Switches on and off cleanly with the rest of the system, ideal for tidy setups.
✅ Isolation feet: Purpose-designed feet keep vibration away from the chassis and out of the sound.

Video

Who is the STA-9X for?

For anyone who wants to add a serious, space-saving power amp to their preamp or integrated amp with pre-out – and for anyone who wants to keep a clean upgrade path to mono power amps open. Also a lean, fast solution in an active or bi-amping setup.

Honestly: The STA-9X is a pure power amp with no volume control – without a preamp or an integrated amp with pre-out, nothing here will run. 2 × 130 W is comfortably enough for the vast majority of speakers; on extremely low-impedance, power-hungry speakers in stereo mode it will eventually hit its limits – then mono mode with two units is the answer. If you're expecting tube warmth, look elsewhere: the STA-9X sounds clean and neutral, not romantic.

Our verdict

The STA-9X is our insider tip for anyone looking for a lot of power amp in very little space. At HD Zürisee in Wädenswil we appreciate it because it stays cool, quiet, and controlled while still hitting hard – and because it offers an honest upgrade path to a monoblock pair down the line. The trade press agrees: AVForums awarded the STA-9X 9 out of 10 points in 2024, and HiFi-IFAs also praised the combination with the DAC-9X. For its price it delivers a speed that makes many a much heavier beast look old.

Technical data

Amplifier type: Class-A input stage + Class-D output stage, 750 kHz switching frequency
Power: 2 × 130 W (stereo) / 1 × 330 W (mono) into 8 & 4 Ω
Peak power: 2 × 170 W / 1 × 370 W into 8 Ω
Inputs: 1 × RCA (unbalanced), 1 × XLR (balanced), trigger-in 12 V
Outputs: Stereo speaker, mono speaker, trigger-out 12 V
Input impedance: 47 kΩ
Output impedance: 20 mΩ
Gain: 29.1 dB
Signal-to-noise ratio: > 90 dB (at 1 W / 10 W / 100 W)
THD+N: 0.005 %
Frequency response: 10 Hz – 50 kHz
Mains voltage: 115 / 230 VAC switchable; slow-blow fuse 3 A / 250 V
Dimensions (W × H × D): 235 × 55 × 281 mm
Weight: 4 kg
Colour: Silver
Included: STA-9X stereo power amplifier, power cable, quick guide

Frequently asked questions

How much power does the NuPrime STA-9X have?
In stereo mode the STA-9X delivers 2 × 130 W into 8 and 4 Ω. Switched and bridged, it works as a mono power amp with 330 W. That's clearly enough for the vast majority of speakers; for especially power-hungry speakers, two units can be combined as a monoblock pair.

Can I run two STA-9X units as mono power amps?
Yes. Each STA-9X can be switched into mono mode via a switch and then delivers 330 W. With two units you drive one speaker each with its own power amp – that noticeably improves channel separation, control, and imaging. A clean, step-by-step upgrade path.

Do I need a preamp for the STA-9X?
Yes. The STA-9X is a pure power amp with no volume control. You need a preamp or an integrated amp with pre-out. It combines well, for example, with a NuPrime preamp or a DAC with volume control. We're happy to help you find the right match.

Does the STA-9X suit my speakers sonically?
The STA-9X sounds fast, neutral, and controlled – it rewards precise, dynamic speakers. It deliberately doesn't deliver tube warmth. Whether it suits your speakers, your room, and your taste is something we're happy to assess together with you.

Why buy the NuPrime STA-9X at HD Zürisee?
Because we know which preamps and speakers make the STA-9X shine – from practical experience, not just the spec sheet. You get personal advice from Andy and Maurizio, service through our own technician, and support with setup and the mono upgrade. Reachable by phone, WhatsApp, or in Wädenswil.