Synthesis Roma 510AC

Synthesis Roma 510AC – Integrated Stereo Tube Amplifier

Elegant Italian valve power with real authority and emotion. The Synthesis Roma 510AC is a 2 × 80 W integrated tube amplifier built around KT88/6550 output valves in push-pull pentode configuration. Combining classic tube richness with modern control and low noise, it is designed to be the beating heart of a serious two-channel system.

• 2 × 80 W RMS per channel (6 Ω) in Class AB pentode configuration
• KT88/6550 power tubes with 12AX7 input and 12BH7 driver stages
• 5 line inputs plus variable pre-out for system expansion
• Heavy 25 kg chassis with custom output transformers and remote control

Product Overview

The Synthesis Roma 510AC brings together traditional tube topology and careful Italian engineering. At its core is a power stage using a pair of KT88/6550 tubes per channel in push-pull pentode, driven by a 12BH7 phase splitter and a 12AX7 input stage. This design delivers 80 watts of genuine tube power with excellent drive, dynamics and tonal colour.

A rigid, mechanically isolated chassis supports the power transformer and high-grade iron-silicon output transformers, reducing vibration and noise. DC-stabilised heaters (for all tubes except the KT88/6550) keep hum to a minimum, allowing the Roma 510AC to combine tube warmth with a very low noise floor.

Listening Experience

The Roma 510AC offers a full-bodied, detailed and highly engaging sound. Bass is weighty and controlled, giving rock, jazz and orchestral music a convincing sense of scale and drive. The midrange is textured and open, rendering vocals and acoustic instruments with natural timbre and emotional impact.

High frequencies are smooth yet articulate, avoiding harshness while preserving air and ambience. The amplifier’s dynamic capabilities and wide soundstage make recordings feel alive and three-dimensional, from intimate small-scale sessions to complex symphonic works.

Recommended Room Size

With its 2 × 80 W output and robust power supply, the Roma 510AC is ideal for medium to large rooms. It has the current capability to control demanding loudspeakers at realistic listening levels while retaining refinement at late-night volumes.

Speaker Pairing

The Roma 510AC pairs beautifully with a wide range of high-quality loudspeakers, from sensitive standmounts to substantial floorstanders:

• Bookshelf speakers – benefit from the amp’s warmth, imaging precision and low-level detail.
• Floorstanding speakers – take advantage of the 80 W tube power and strong bass control in larger spaces.
• Moderate to high sensitivity designs (around 88 dB and above) – allow the Roma 510AC to deliver effortless dynamics and headroom.

Its slightly rich, musical balance makes matching straightforward; it flatters neutral or revealing speakers without ever sounding clinical.

Ideal Applications

• Dedicated stereo systems focused on musical involvement and timbre
• Upgrading from solid-state integrated amplifiers to valve amplification
• Vinyl and digital setups where texture, space and dynamics are key
• Systems that may later add a separate power amplifier via the pre-out

Technical Specifications

• Type: Integrated stereo tube amplifier
• Power output: 80 W RMS per channel @ 6 Ω (Class AB, pentode)
• Power stage (per channel): 2 × KT88 / 6550
• Driver stage (per channel): 1 × 12BH7 / ECC99
• Input stage (per channel): 1 × 12AX7 / ECC83
• Configuration: Push-pull pentode
• Frequency response: 20 Hz – 20 kHz (±0.5 dB)
• Input impedance: 50 kΩ
• Input sensitivity: approx. 300 mV for full output (80 W)
• Output impedance: 6 Ω
• Signal-to-noise ratio: > 90 dB (A-weighted)
• Inputs: 5 × line (gold-plated RCA)
• Outputs: 1 × pre-out (volume-controlled)
• Tube heaters: DC-stabilised (except KT88/6550) to minimise hum
• Output transformers: Custom high-grade iron-silicon core
• Remote control: RC5 infrared – volume, mute, input selection
• Power consumption: up to approx. 280–300 W
• Dimensions (W × D × H): 410 × 420 × 210 mm
• Weight: approx. 25 kg

Why Choose the Synthesis Roma 510AC?

The Synthesis Roma 510AC is an outstanding choice for music lovers who want the tonal beauty and involvement of tubes with the authority and practicality of a modern integrated amplifier. With generous 80 W output, carefully engineered transformers, low noise and a refined, holographic presentation, it forms a superb foundation for an expressive, long-term stereo system.