Headrush Impulse Responses
Birch410
Inspired by Ashdown® 4x10 (Bass Cab)
Interpretation:
- Birch → cabinet in birch plywood
- 410 → checkout 4x10” (four 10” speakers)
Sound character
This type of case is very particular:
- low more controlled compared to 1x15
- fast attack
- averages present
- higher notes more defined but not aggressive
Typical for:
- funk
- dynamic cleans
- bass guitar
- vintage rock
- defined rhythm guitar
Recommended Parameters
Gain (dB)
Controls the IR level
Birch410 is “tighter” → less risk of mixing compared to 1x15
Examples:
- Clean: -4 dB
- Funk: -5 dB
- Rock: -6 / -7 dB
Rule: Maintain headroom to preserve dynamics
HiCut (Hz)
Cuts high frequencies
Birch410 has more attack → watch out for the highs
Realistic range:
- 5 kHz → 9 kHz
Examples:
- Clean: 6 kHz
- Funk: 6.5–7 kHz
- Rock: 7–8 kHz
Rule: too high = “spiky” sound, too low = you lose definition
LoCut (Hz)
Cuts low frequencies
4x10 = tighter bass → you can use lower LoCut than 1x15
Realistic range:
- 70Hz → 120Hz
Examples:
- Clean: 80 Hz
- Funk: 90 Hz
- Rock: 100–110 Hz
Rule: Keeps punch without mud
Mix (%)
Blend IR / dry
Standard:
- 100%
Creative:
- 80–90% for parallel textures
Pro Tips
Great starting point:
- Gain: -5 dB
- HiCut: 6.5–7 kHz
- LoCut: 90 Hz
- Mixes: 100%
If the sound is:
- too “thin” → lower LoCut
- too “sharp” → lower HiCut
- little punch → raise Gain slightly
Setup Examples
Clean Funk (super defined)
Gain-5 dB
HiCut6.5 kHz
LoCut90 Hz
Mixes100%
Sound:
- fast attack, very dynamic
Bright clean/pop
Gain-4 dB
HiCut7 kHz
LoCut80 Hz
Mixes100%
Sound:
- clear, open, modern
Light rock/crunch
Gain-6 dB
HiCut7.5 kHz
LoCut100 Hz
Mixes100%
Sound:
- defined, compact, punchy
Use on bass
Gain-5 dB
HiCut5 kHz
LoCut70–80 Hz
Mixes100%
Sound:
- tight, fast, perfect for slap