Leema's Quantum line packs flagship engineering into a new amplifier pairing

Leema Graviton and Neutron Pre amp side by side on a wooden cabinet
(Image credit: Leema)

It's supposedly taken 25 years, but Leema Acoustics has finally unveiled the first official offerings from its recently announced Quantum range: the Neutron preamplifier and the Graviton power amplifier. The Quantum range is itself the first proper Leema Acoustics audio line for the brand in over a decade, building on the company's flagship Constellation series but with a greater emphasis on affordability (by Leema's standards) and simplicity of design.

The new Neutron model is, per the manufacturer, a "modern preamp that perfectly distils Leema Acoustics’ near 25-year hi-fi manufacturing experience into an affordable audio hub". Developed to elicit maximum audio transparency, the Neutron's offering of a whopping 13 inputs makes it a hugely flexible unit.

Those inputs include four RCA and a single XLR, an MM/MC phono stage, three optical, three coaxial and a single USB input. Outputs, meanwhile, include a fixed-level record, two dedicated subwoofer ports, a dedicated headphone amplifier slot and even a 12V trigger.

The Neutron also introduces Leema Acoustics’ newest circuit designs, with reduced crosstalk for greater sonic transparency. Vinyl lovers, meanwhile, will benefit from the model's switchable MM/MC phono stage, based on Leema's unique proprietary design. The preamp employs an asynchronous ESS 24-bit/192 kHz USB DAC and a dedicated headphone amplifier, as well as a Burr-Brown analogue volume control.

Leema Neutron pre amp in silver on a white background

The Leema Neutron preamp boasts a whopping 13 input sources. (Image credit: Leema Acoustics)

Conversely, the Class A/B Graviton stereo power amp utilities what Leema claims could be the "biggest toroidal power supply ever seen at its price point" for greater control over a wide variety of speakers. The new amp offers 150W per channel into 8 ohms, with a high-current topology deploying six transistors per channel.

The Graviton also boasts a single transformer supply and six matched output transistors per channel for rapid current delivery. The use of dual speaker binding posts should allow for simpler bi-wiring, while line-level loop through-outputs facilitate easy bi-amping.

According to Leema founder Lee Taylor: "Quantum takes much of the Leema Acoustics’ Constellation product design (which has been) simplified to meet a more affordable price point. However, no compromises have been made where it really counts". 

Available in brushed black or silver finishes, the new Nuetron pre-amp is available now for £1500, while the Graviton will also set you back £1500. Bought together, however, and you'll receive a £200 package discount, taking the total down to just £2800.  


This modern CD system offers a simple but winning combination

Our guide to the best stereo amplifiers you can buy 

I’m a hi-fi expert and these five-star systems deliver stunning value and performance

Harry McKerrell
Staff writer

Harry McKerrell is a staff writer at What Hi-Fi?. He studied law and history at university before working as a freelance journalist covering TV and gaming for numerous platforms both online and in print. When not at work he can be found playing hockey, practising the piano or forcing himself to go long-distance running.