The Universal Audio OX Amp Top Box is a Universal Audio distortion pedal. Close alternatives include the Mooer Radar Simulador de altavoz and the Walrus Audio Mako ACS1 MKII. It pairs well with the Marshall Plexi 1959SLP and the Marshall Bluesbreaker.
Universal Audio OX Amp Top Box
Universal Audio · pedal
The Universal Audio OX Amp Top Box is a premium reactive load box and cab simulator from Universal Audio of Santa Cruz, California, combining speaker load, cabinet simulation, and room emulation for silent recording and attenuated live performance with any tube amplifier.
What stands out
“The Universal Audio OX Amp Top Box is a premium reactive load box and cab simulator from Universal Audio of Santa Cruz, California, combining speaker load, cabinet simulation, and room emulation for silent recording and attenuated live perf…”
— from the listing
“professional studio engineers and live players who want premium reactive load recording find the ox among the finest available”
— from the community notes
“Build quality is excellent and professional-grade”
— from the community notes
“Authentic reactive load and high-quality IR cabinet simulation suit studio recording and live attenuated applications”
— from the reviews
“Universal Audio's premium reactive load and cab sim, praised for exceptional amplifier interaction and outstanding cabinet simulation”
— from the community notes
- studio
- silent recording
- recording
- universal audio
- attenuated live performance
- professional studio engineers
- live attenuated applications
Good for
- Silent Recording
- Silent Stage
Amps that pair well with the Universal Audio OX Amp Top Box
Marshall Plexi 1959SLP
amplifier
19% matchMarshall Plexi 1959SLP leans toward aggressive, and that's a real, usable character to pair with
Comes later in the signal chain
Marshall Bluesbreaker
Marshall
18% matchBoth lean toward dynamic and compressed respectively — close enough in character that they complement instead of clashing
Comes later in the signal chain
Gallien-Krueger Fusion 210
Gallien Krueger
tonal matchComes later in the signal chain
Gallien-Krueger Fusion 210 goes after Universal Audio OX Amp Top Box in the chain
Ceriatone HRM 50
Ceriatone
tonal matchComes later in the signal chain
Put Ceriatone HRM 50 after Universal Audio OX Amp Top Box
EBS Magni 502 2x10 bass combo
Ebs
tonal matchComes later in the signal chain
Put EBS Magni 502 2x10 bass combo after Universal Audio OX Amp Top Box
Aguilar SL110 Fawn Limited
Aguilar
tonal matchComes later in the signal chain
Aguilar SL110 Fawn Limited goes after Universal Audio OX Amp Top Box in the chain
Ceriatone Overtone Special HRM Bluesmaster 50
Ceriatone
tonal matchComes later in the signal chain
Ceriatone Overtone Special HRM Bluesmaster 50 goes after Universal Audio OX Amp Top Box in the chain
Gallien-Krueger Legacy 410
Gallien Krueger
tonal matchComes later in the signal chain
Put Gallien-Krueger Legacy 410 after Universal Audio OX Amp Top Box
Pedals that stack with the Universal Audio OX Amp Top Box
Dallas Rangemaster Treble Booster
Dallas
14% matchWhat Dallas Rangemaster Treble Booster brings here leans toward germanium — that's worth building a pairing around
Comes earlier in the signal chain
ProCo RAT 2
Proco
13% matchProCo RAT 2's own low gain character is the real reason this is worth trying
Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator
pedal
10% matchPut Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator after Universal Audio OX Amp Top Box in the signal chain, clear of Universal Audio OX Amp Top Box's own gain stage
Comes later in the signal chain
Electro-Harmonix XO Deluxe Memory Man
Electro-Harmonix
9% matchThe OX's attenuated, silent-recording signal feeds the Memory Man's lush analog echo a controlled source to trail off. — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Ashdown Macchiato Compressor Guy Pratt Signature
Ashdown
8% matchUniversal Audio OX Amp Top Box's dynamic character and Ashdown Macchiato Compressor Guy Pratt Signature's compressed voice sit in the same lane rather than fighting each other
Comes earlier in the signal chain
Dunlop - MXR Carbon Copy Deluxe Analog Delay
Dunlop
7% matchKeep Universal Audio OX Amp Top Box's dynamic voice out front: Dunlop - MXR Carbon Copy Deluxe Analog Delay goes after Universal Audio OX Amp Top Box in the signal chain so its analog warmth voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Matthews Effects The Pocket Drive Overdrive Boost
Matthews Effects
tonal matchComes earlier in the signal chain
Matthews Effects The Pocket Drive Overdrive Boost goes in front of Universal Audio OX Amp Top Box in the chain
EarthQuaker Devices Swiss Things
EarthQuaker Devices
Alternatives
Mooer Radar Simulador de altavoz
Mooer
60% similarityShared character: recording
Walrus Audio Mako ACS1 MKII
Walrus Audio
60% similarityShared character: recording, studio
NuX NSS-6 Solid Studio MKII
Nux
56% similarityShared character: studio
IK Multimedia Tonex ONE
Ik Multimedia
49% similarityShared character: recording, studio
Palmer Pocket Amp MKII Portable
Palmer
47% similarityShared character: recording
One Control Amp In A Box OC-FOAIABn
One Control
46% similarityShared character: recording
Tech 21 SansAmp Classic
Tech 21
44% similarityShared character: recording
EarthQuaker Devices Zeqd
EarthQuaker Devices
44% similarityShared character: recording, studio
Friedman IR-X
Friedman
43% similarityShared character: studio
DSM & Humboldt Simplifier MkII
Dsm Humboldt Electronics
41% similaritySimilar role and voicing
DSM Silver Linings Drive Preamp Engine
Dsm Humboldt Electronics
41% similarityShared character: recording, studio
Friedman IR-X Dual Tube Preamp
Friedman
41% similarityShared character: recording
See all alternatives to the Universal Audio OX Amp Top Box (cheaper + boutique) →
Questions people ask
What are good alternatives to the Universal Audio OX Amp Top Box?+
The closest matches in character are the Mooer Radar Simulador de altavoz, the Walrus Audio Mako ACS1 MKII, the NuX NSS-6 Solid Studio MKII.
What pairs well with the Universal Audio OX Amp Top Box?+
Strong matches from rig and tone-complementarity evidence: Marshall Plexi 1959SLP, Marshall Bluesbreaker, Gallien-Krueger Fusion 210 — Marshall Plexi 1959SLP leans toward aggressive, and that's a real, usable character to pair with.