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Sugden Masterclass LA-4

Preamplifier

Relative price

typical

Among the 29 preamplifiers 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

Sugden Masterclass series preamp; designed and hand-built Heckmondwike, West Yorkshire. Volvo-school single-technician build. Class A output stage — Sugden's defining signature since the 1960s A21.

Topology: 4 RCA + 1 XLR inputs, 2 RCA + 1 XLR outputs. Balanced and single-ended throughout. Relay switching of all inputs. Gold-plated PCBs. Motorised volume (RC5 remote-compatible).

High input sensitivity (100mV → 1V) makes it well-suited to driving low-output sources like phono stages. 50kΩ in / 600Ω out impedance is moderate by modern standards — fine for typical interconnect lengths.

Competition record

Assessed against 8 rivals across the sixty systems: it takes the slot in none of its 45 head-to-heads.

Where it gives ground

The dimension the engine names as the weakest link, counted across every head-to-head it lost.

  • quietness at rest ×52
  • vocal presence ×12
  • low-level clarity ×8
  • midrange truth ×3

Who it comes up against

Music First Audio Baby Reference V2

10 lost · Anchored, Artisan, Cavity-Native, Characterful, PRaT, Reference, Romantic, Silent Path

Against the Silent Path brief, the Music First Audio Baby Reference V2 keeps the slot decisively.

With the Whest Audio 60Se Pro, the pairing gives up most on quietness at rest.

With the Audio Note P1 SE, the pairing gives up most on quietness at rest.

On its own merits the Sugden Masterclass LA-4 is the weaker preamplifier for that brief.

had not heard a better preampStereophile (Art Dudley) — Baby Reference V1 review
had not heard a better preampStereophile (Art Dudley) — Baby Reference V1 review

Audiolab 9000Q

9 lost · Anchored, Artisan, Characterful, PRaT, Reference, Romantic, Silent Path

Against the Anchored brief, the Audiolab 9000Q keeps the slot clearly.

With the Musical Fidelity M8x Vinyl, the pairing gives up most on quietness at rest.

On its own merits the Sugden Masterclass LA-4 is the weaker preamplifier for that brief.

S/N exceeding 112dB A-weighted, THD <0.002%Audiolab 9000P/Q HomeTheaterReview specs + Audio Tailor review

NVA P50 MKII

9 lost · Anchored, Artisan, Cavity-Native, Characterful, Intimate, PRaT, Reference, Romantic, Silent Path

Against the Anchored brief, the NVA P50 MKII keeps the slot clearly.

With the Audiolab 9000P, the pairing gives up most on quietness at rest.

With the Rega Aria Mk3 MM/MC, the pairing gives up most on quietness at rest.

On its own merits the Sugden Masterclass LA-4 is the weaker preamplifier for that brief.

wideband S/N... disappointing, 56dBStereophile (Atkinson) 2019

NVA P50SA MKII

8 lost · Anchored, Artisan, Cavity-Native, Intimate, PRaT, Reference

Against the Anchored brief, the NVA P50SA MKII keeps the slot clearly.

With the Longdog Audio P6100M (pair), the pairing gives up most on quietness at rest.

With the Rega Aria Mk3 MM/MC, the pairing gives up most on quietness at rest.

On its own merits the Sugden Masterclass LA-4 is the weaker preamplifier for that brief.

pin sharp clarityNVA owner consensus (P50SA)
pin sharp clarityNVA owner consensus (P50SA)

Leema Neutron

4 lost · Cavity-Native, Characterful, Romantic

Against the Cavity-Native brief, the Leema Neutron keeps the slot decisively.

With the Leema Hydra II, the pairing gives up most on vocal presence.

With the Rega Aura Reference MC, the pairing gives up most on quietness at rest.

On its own merits the Sugden Masterclass LA-4 is the weaker preamplifier for that brief.

EAR Yoshino 868L (Line)

2 lost · Intimate

Against the Intimate brief, the EAR Yoshino 868L (Line) keeps the slot decisively.

With the EAR Yoshino 890, the pairing gives up most on midrange truth.

With the Rega Aura Reference MC, the pairing gives up most on low-level clarity.

On its own merits the Sugden Masterclass LA-4 is the weaker preamplifier for that brief.

wideband S/N... disappointing, 56dBStereophile (Atkinson) 2019
Sugden Class A solid-state preampSugden Masterclass LA-4 + Hi-Fi News

Exposure 3510 Preamplifier

2 lost · Artisan, Reference

Against the Artisan brief, the Exposure 3510 Preamplifier keeps the slot clearly.

With the Exposure XM9 Biamp 2x2 (4 units), the pairing gives up most on vocal presence.

On its own merits the Sugden Masterclass LA-4 is the weaker preamplifier for that brief.

Audio Note M2 Phono

1 lost · Intimate

Against the Intimate brief, the Audio Note M2 Phono keeps the slot clearly.

With the Audio Note P1 SE, the pairing gives up most on midrange truth.

On its own merits the Sugden Masterclass LA-4 is the weaker preamplifier for that brief.

Sugden Class A solid-state preampSugden Masterclass LA-4 + Hi-Fi News

What the reviewers said

Sugden Class A solid-state preamp Sugden Masterclass LA-4 + Hi-Fi News· Harmonic texture
preserved subtle soundstage cues Stereophile (Schryer) 2019· Spatial resolution
rich mids, and rock-solid lows Stereophile (Schryer) 2019· Tonal body
wideband S/N... disappointing, 56dB Stereophile (Atkinson) 2019· Low-level noise floor

How it scores

Clarity

  • Spatial resolution 76 from listening evidence

Voice

  • Tonal body 76 from listening evidence
  • Harmonic texture 72 from listening evidence

LowerVolume

  • Low-level noise floor 64 from listening evidence

Specifications

is balanced internalTrue
is dual monoTrue
has built in phonoFalse
rca inputs4
xlr inputs1
line input impedance kohm50.0
line input sensitivity mv100.0
rca outputs2
xlr outputs1
din outputs0
output impedance ohm600
output max v10.0
psu upgrade portFalse
headphone outFalse
internal bass managementnone
gain db12.0
thd pct0.006
frequency response hz6/300000
crosstalk db90.0
dimensions mm430/75/350
weight kg7.0
notes