The Electro-Harmonix Steel Leather Attack Expander is an Electro-Harmonix eq pedal, currently around $33.56. Close alternatives include the Creation Audio Labs Funkulator and the Behringer BEQ700 Bass Graphic Equalizer Effetto. It pairs well with the Swart Star-Base 1 and the Phil Jones Bass Compact Plus BG-450.
Electro-Harmonix Steel Leather Attack Expander
Electro-Harmonix · pedal
The Electro-Harmonix Steel Leather Attack Expander is a bass-specific dynamics pedal that expands and emphasizes note attack, adding punch and definition to picked or slapped bass lines rather than compressing dynamics down. It's built to sharpen transient response, making individual notes cut through a mix with more percussive clarity, aimed at bassists wanting more aggressive attack character rather than smoother sustain.
What stands out
“It's built to sharpen transient response, making individual notes cut through a mix with more percussive clarity, aimed at bassists wanting more aggressive attack character”
— from the listing
“Primary use case is slap and picked bass styles wanting sharper, more aggressive transient punch cutting through a mix”
— from the community notes
“Attack expansion is a genuinely distinctive dynamics-processing approach, the functional opposite of typical bass compression, specifically emphasizing transient punch”
— from the reviews
“The Electro-Harmonix Steel Leather Attack Expander is a bass-specific dynamics pedal that expands and emphasizes note attack, adding punch and definition to picked or slapped bass lines”
— from the listing
“Reflects EHX's willingness to build genuinely specialized dynamics tools beyond standard compressor designs”
— from the reviews
Trade-offs
“Valued for doing the opposite of a typical compressor, expanding”
— from the community notes
- attack
- punch
- aggressive
- transient
- mix
- bass
- clarity
- transient response
Price updated Oct 25, 2026
Amps that pair well with the Electro-Harmonix Steel Leather Attack Expander
Swart Star-Base 1
Swart
15% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → warm)
Run Swart Star-Base 1 after it and the bright edge settles into something more warm
Comes later in the signal chain
Phil Jones Bass Compact Plus BG-450
Phil Jones
11% matchWhat Phil Jones Bass Compact Plus BG-450 brings here leans toward high headroom — that's worth building a pairing around
Comes later in the signal chain
Hiwatt Park P18LH 'Little 45' Handwired18W
Hiwatt
tonal matchComes later in the signal chain
Hiwatt Park P18LH 'Little 45' Handwired18W's warm balances out the bright tone
Orange BT1000H Terror Bass 1000-Watt Bass Amp
Orange
tonal matchComes later in the signal chain
Where this leans bright, Orange BT1000H Terror Bass 1000-Watt Bass Amp answers back warm
Orange Terror Bass
Orange
tonal matchComes later in the signal chain
Where this leans bright, Orange Terror Bass answers back warm
Orange Little Bass Thing
Orange
tonal matchComes later in the signal chain
Orange Little Bass Thing's warm balances out the bright tone
Gibson GA-50
Gibson
tonal matchComes later in the signal chain
Gibson GA-50 leans warm right where the bright tone needs it
Victory Amplifiers V50 The Earl
amplifier
tonal matchComes later in the signal chain
Run Victory Amplifiers V50 The Earl after it and the bright edge settles into something more warm
Pedals that stack with the Electro-Harmonix Steel Leather Attack Expander
Walrus Audio Fable
Walrus Audio
22% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Run Walrus Audio Fable after Electro-Harmonix Steel Leather Attack Expander in the signal chain, where it won't crowd Electro-Harmonix Steel Leather Attack Expander — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Greer Mizuki blue
Greer
22% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → warm)
Greer Mizuki blue's warm balances out the bright tone
Comes earlier in the signal chain
Catalinbread SFT
Catalinbread
21% matchfills a frequency gapFills in a frequency range the other side doesn't cover, instead of piling more onto what's already there. (bright → warm)
Run Catalinbread SFT after it and the bright edge settles into something more warm
Comes earlier in the signal chain
T-Rex Junior Roomate
T Rex
19% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Keep T-Rex Junior Roomate after Electro-Harmonix Steel Leather Attack Expander in the signal chain, where it won't crowd Electro-Harmonix Steel Leather Attack Expander — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
SolidGoldFX Commodore Breaker Overdrive
Solidgoldfx
tonal matchComes earlier in the signal chain
Where this leans bright, SolidGoldFX Commodore Breaker Overdrive answers back smooth
Dunlop Blue Hippo Optical Tremolo
Dunlop
tonal matchComes later in the signal chain
Dunlop Blue Hippo Optical Tremolo's warm balances out the bright tone
Black Rabbit Little Earthquakes
Black Rabbit
tonal matchComes later in the signal chain
Black Rabbit Little Earthquakes's warm balances out the bright tone
NuX 6ixty5ive Overdrive Effektpedal
Nux
tonal matchComes earlier in the signal chain
Run NuX 6ixty5ive Overdrive Effektpedal after it and the bright edge settles into something more warm
Cheaper alternatives
Boutique & premium upgrades
Similar character
See all alternatives to the Electro-Harmonix Steel Leather Attack Expander (cheaper + boutique) →
Questions people ask
What are good alternatives to the Electro-Harmonix Steel Leather Attack Expander?+
The closest matches in character are the Creation Audio Labs Funkulator, the Behringer BEQ700 Bass Graphic Equalizer Effetto, the Aguilar DB316. Budget picks: Behringer BEQ700 Bass Graphic Equalizer Effetto. Boutique upgrades: Aguilar DB316, Chaos Custom Shop Blender.
What pairs well with the Electro-Harmonix Steel Leather Attack Expander?+
Strong matches from rig and tone-complementarity evidence: Swart Star-Base 1, Phil Jones Bass Compact Plus BG-450, Hiwatt Park P18LH 'Little 45' Handwired18W — Run Swart Star-Base 1 after it and the bright edge settles into something more warm.
How much does the Electro-Harmonix Steel Leather Attack Expander cost?+
Around $33.56 (live listing price, updated Oct 25, 2026).