Longdog Audio P6100M Biamp 2x2 (4 units)
13 lost · Anchored, Artisan, Characterful, PRaT, Reference, Romantic
Against the Anchored brief, the Longdog Audio P6100M Biamp 2x2 (4 units) keeps the slot decisively.
Arcam A25+
Integrated amplifier
Relative price
typical
Among the 59 integrated amplifiers in the catalogue, this one is typical.
A band places a component against its peers and carries no price. It is deliberately the only price indicator on this page: a second one, measured against a different set, would narrow the two together far enough to give the figure away.
What it is
Arcam Radia A25+ — flagship Radia Plus integrated; refreshed 2025 over original A25 (2023). Arcam 5th-generation Class G amplification: Class A up to 15W (zero crossover distortion) + Class AB beyond. 100W/8Ω + 165W/4Ω. ES9280A Pro DAC (analogue) + ES9018 DAC (SPDIF) — dual-DAC architecture. HDMI eARC + USB-C + Bluetooth 5.4.
Audioholics bench review (2024): "100 watt/ch slimline stereo integrated amplifier featuring high resolution DACs, excellent noise and distortion performance on our test bench... 100dB SINAD at near full rated power... SNR of 95dB at 1 watt demonstrates that Arcam prioritized a very clean signal path."
Audioholics noted limitations: "low preamp output drive clipping at 1V RMS and the ho-hum phono preamp section. However, the A25 was not designed to be a standalone preamp." For diehard vinyl users, pair with external phono stage. Pre-out 1V is acceptable for A25-matched partner amps but inadequate for long-cable runs to high-Z power amps.
"+" refresh upgrades vs original A25: transformer upgrade + better linear regulation to analogue PSU + further refinements to power and mains filtering ("enhance overall clarity"). Visual: precision-cut glass front panel.
Speaker pairing: 100W/8Ω + 165W/4Ω + Class A first 15W + DF~150 = most demanding speakers. Excellent partner for low-sensitivity reactive loads (B&W 800-series, KEF Reference, PMC active, Magneplanar). Tower speakers in large rooms work confidently.
CATALOG CORRECTION: original IAG ownership note was wrong — Arcam is Harman International (Samsung), not IAG.
Competition record
Assessed against 19 rivals across the sixty systems: 2 head-to-heads won, 58 lost.
Where it gives ground
The dimension the engine names as the weakest link, counted across every head-to-head it lost.
- low-level clarity ×8
- tonal body ×4
Who it comes up against
NVA S80 Stereo
8 lost · Artisan, Cavity-Native, Characterful, Intimate, PRaT, Reference, Romantic, Silent Path
No completion of this shape fits that slot's budget.
Audiolab 9000P
5 lost · Anchored, Characterful, PRaT, Romantic, Silent Path
Against the Characterful brief, the Audiolab 9000P keeps the slot decisively.
Sugden ANV 50
4 lost · BBC Sound, Twin Arms
Against the Twin Arms brief, the Sugden ANV 50 keeps the slot decisively.
On its own merits the Arcam A25+ is the stronger integrated amplifier — but it loses here on fit: the way it sits with the rest of this system under the Twin Arms weighting.
It sits well below the share of the budget this brief aims at the integrated amplifier position.
Leema Hydra II
4 lost · Cavity-Native, Characterful, Romantic
Against the Cavity-Native brief, the Leema Hydra II keeps the slot decisively.
NVA S300 Stereo (Artisan)
4 lost · Artisan, Cavity-Native, Intimate, Reference
Against the Intimate brief, the NVA S300 Stereo (Artisan) keeps the slot decisively.
Icon Audio Stereo 30 SE (KT150)
3 lost · Vocals-First
Against the Vocals-First brief, the Icon Audio Stereo 30 SE (KT150) keeps the slot clearly.
With the Tom Evans Groove+ SRX MkII, the pairing gives up most on tonal body.
On its own merits the Arcam A25+ is the weaker integrated amplifier for that brief.
It sits well below the share of the budget this brief aims at the integrated amplifier position.
Audio Note P1 SE
3 lost · Intimate, Silent Path
Against the Silent Path brief, the Audio Note P1 SE keeps the slot decisively.
EAR Yoshino V12
3 lost · BBC Sound, Vocals-First
Against the BBC Sound brief, the EAR Yoshino V12 keeps the slot decisively.
With the Rega Aura Reference MC, the pairing gives up most on low-level clarity.
With the Falcon LS3/5a Gold Badge, the pairing gives up most on low-level clarity.
On its own merits the Arcam A25+ is the weaker integrated amplifier for that brief.
Exposure XM9 Biamp 2x2 (4 units)
3 lost · Artisan, PRaT, Reference
Against the Artisan brief, the Exposure XM9 Biamp 2x2 (4 units) keeps the slot decisively.
EAR Yoshino 890
2 lost · Intimate
Against the Intimate brief, the EAR Yoshino 890 keeps the slot decisively.
Chord ULTIMA 6
1 lost · Cavity-Native
Against the Cavity-Native brief, the Chord ULTIMA 6 keeps the slot decisively.
Longdog Audio P6100M (pair)
1 lost · Anchored
Against the Anchored brief, the Longdog Audio P6100M (pair) keeps the slot decisively.
Exposure 3510
1 lost · Twin Arms
Against the Twin Arms brief, the Exposure 3510 keeps the slot clearly.
On its own merits the Arcam A25+ is the weaker integrated amplifier for that brief.
Sugden A21 Signature
1 lost · BBC Sound
Against the BBC Sound brief, the Sugden A21 Signature keeps the slot decisively.
With the Naim NVC TT MM/MC, the pairing gives up most on low-level clarity.
With the Harbeth P3ESR XD2, the pairing gives up most on low-level clarity.
On its own merits the Arcam A25+ is the weaker integrated amplifier for that brief.
Leak Stereo 230
1 lost · Vocals-First
Against the Vocals-First brief, the Leak Stereo 230 keeps the slot by a whisker.
On its own merits the Arcam A25+ is the weaker integrated amplifier for that brief.
Quad Artera Stereo
1 lost · Silent Path
Against the Silent Path brief, the Quad Artera Stereo keeps the slot decisively.
Rega io
0 lost· 1 won · Twin Arms
Against the Twin Arms brief, the Arcam A25+ takes the slot clearly.
On its own merits the Arcam A25+ is the stronger integrated amplifier for that brief.
It sits well above the share of the budget this brief aims at the integrated amplifier position.
Creek 4040A
0 lost· 1 won · BBC Sound
Against the BBC Sound brief, the Arcam A25+ takes the slot by a whisker.
On its own merits the Arcam A25+ is the stronger integrated amplifier for that brief.
With the Falcon Q7 Complete@Home, the pairing gains most on bass control.
more authority with tower speakersListenUp Radia Plus comparison
What the reviewers said
SNR of 95dB at 1 watt Audioholics bench review 2024· Electrical noise floor
Class A up to 15W with zero crossover distortion Audio Advice Radia overview + Audioholics measurement· Harmonic texture
more authority with tower speakers ListenUp Radia Plus comparison· Bass control
listen at lower volumes but still want texture ListenUp Radia Plus comparison· Micro-dynamic resolution
preamp output drive clipping at 1V RMS Audioholics bench review 2024
How it scores
Clarity
- Electrical noise floor 79 from listening evidence
Voice
- Harmonic texture 75 from listening evidence
Bass
- Bass control 78 from listening evidence
- Physical impact 64 from specification
- Bass extension 64 from specification
LowerVolume
- Low-level noise floor 90 from specification
- Micro-dynamic resolution 78 from listening evidence
- Tonal consistency 70 from specification
Specifications
| power 8ohm w | 100.0 |
|---|---|
| power 4ohm w | 165.0 |
| power class | G |
| damping factor | 150.0 |
| line inputs | 3 |
| xlr inputs | 0 |
| line input sensitivity mv | 380.0 |
| line input impedance kohm | 47.0 |
| has phono | True |
| phono mm | True |
| phono mc | False |
| phono mm load | 47kΩ + 100pF |
| pre out | True |
| pre out level v | 1.0 |
| pre power separable | pre_out_parallel |
| internal bass management | none |
| headphone out | True |
| frequency response hz | 10/72000 |
| snr db | 110.0 |
| thd pct | 0.01 |
| weight kg | 13.0 |
| integrated dac | True |
| digital inputs | 5 |
| notes |