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UL 901 Bass Amp


Modern. Classic.

The Legend Returns
Epifani is proud to (re)introduce the UL-series professional bass amplifier. This is the original Epifani sound, the tone that started a revolution. Used for decades by legendary bassists like Oteil Burbridge, Anthony Jackson, and Matthew Garrison.

Totally Redesigned
The new UL 901’s engineering features modern components like a light-weight, high-reliability digital power supply, an updated PureSound D.I. section, and a refined EQ that gives you total control over your sound in any playing situation.


Legendary Sound


“You shouldn’t have to fight with your amp to get the sound you’re looking for.” - Nick Epifani

The Ultimate EQ
UL 901 features a powerful EQ designed for fine tuning in any playing situation. Dial in the perfect sound for any style in any venue.

Signature Mid-Cut
A simple yet powerful mid-cut feature tuned by Nick Epifani based on feedback from some of the world’s best bass players. Are you ready for the funkiest slap sound ever?


Pro Features


Superior Engineering
UL 901 brings you 1000 watts of pure power. And when you’re on the road the auto-sensing power supply automatically detects the correct voltage no matter where you are in the world.

Studio Ready
Heading into the studio? The award-winning PureSound D.I. gives you the world’s most flexible pre-amp for studio recording in style. No need to plug in a cabinet. Just send your single to the engineer—pre or post EQ—and bring your signature tone to every recording.

Front Panel

4. Bass
Active shelving EQ control with 22 dB boost @ 40 Hz

5. Mid
Active bandpass EQ control with 17 dB boost @ 550 Hz

6. Treble
Active shelving EQ control with 22 dB boost @ 3 kHz

1. Input Jack
Connect your instrument using a standard 1/4 inch instrument cable. 

2. Active/Passive Switch
Provides a 10 dB boost for passive basses. Reduces output signal of active basses to avoid unwanted distortion.

3. Gain
Controls the volume of the signal passing through the EQ stage.


10. Mute
Mutes the amplifier. Red light is on when engaged. The Mute is automatically engaged when you turn on the amplifier.

11. Master Volume
Controls the overall volume of the amplifier. Other outputs including the DI Output, Tuner Out, and Effects Send are not affected by the Master Volume control.

7. Treble Shift
Sets the apex for the Treble control to 3 kHz if pushed in, or 6 kHz if out. 

8. Mid Cut Switch
Activates Mid Cut EQ. Green light is on when active. Expertly tuned for the perfect scooped-mid slap tone. 

9. Mid Cut Level
Provides up to 8 dB of cut @ 800 Hz. To set perfectly: set knob at 12 o'clock position. Activate the Mid Cut using the switch or optional foot pedal. Boost or cut in small increments by turning the knob clockwise or counter-clockwise.

Rear Panel

1, 2. Effects Loop Send and Return
Use a standard 1/4-inch cable to connect the input of your effects to the Send jack, and the output of your effects to the Return jack.

3. Effects Mix
Mix between a dry (unaffected) signal and a wet (effected) signal when external effects are connected to the Effects Loop.

4. Pre/Post EQ Switch
When the switch is engaged the signal coming through the DI Output will be shaped by the active EQ (see above). When the switch is in the up position, no EQ will be sent through the DI Output. 

5. D.I. Level
Adjusts the the output level of the DI Output. 

6. Power On/Off
Turns your amplifier on and off. There is a 2-second delay as the amplifier performs a self-diagnostic. The Mute switch (see above) is automatically engaged when the amp is turned on.


10. Ground Lift
Disconnects the chassis ground from the DI Output to reduce 60-cycle hum.

11. D.I. Output
A balanced, low impedance output. Connect a standard XLR microphone cable to send a signal to a mixing console or recording device. 

12. Universal AC Power Port
Use the included cable to connect your UL 901 to a standard power source.

13. T10 AL 250 Volt Fuse
Protects your UL 901 from power surges that can damage the amplifier.

7. Neutrik Speakon / 1/4-inch Combo Speaker Output
Connect either a Speakon™ twist-lock speaker cable or 1/4-inch speaker cable. For the best results use a Speakon-to-Speakon cable. Do not exceed the minimum impedance as indicated on the back of the amp.

8. Tuner Out
Connect your electronic tuner via a standard 1/4-inch instrument cable. UL 901 sends a signal to your tuner even when you engage the Mute switch.

9. Pedal
Use a TRS 1/4-inch to connect the optional foot pedal. Use the foot pedal to engage/disengage the Mid-Cut feature and Mute.



Single Channel Preamp
Class-D Power Amp
Switch-Mode Power Supply

Power Rating
1000 Watts RMS
Minimum Load: 2 Ohms

1/4-inch TS Phone Jack Passive: 470KΩ
- Active: 200KΩ
Output: Combination SpeakonTM and 1/4-inch
Send: 1/4-inch TS Phone Jack 200KΩ
Return: 1/4-inch TS Phone Jack 50KΩ
Tuner Out: 1/4-inch TS Phone Jack
Foot Switch: 1/4-inch TRS Phone Jack
Direct Out: Low Impedance XLR w/ Level Control
Pre/Post EQ: Selectable Switch sets DI Output to Pre/Post EQ

Tone Controls
Shelving, +22 dB @ 40 Hz
Mid: +17 dB @ 450 Hz
Treble: Shelving, +22 dB @ 3 kHz or 6 kHz
Mid Cut: -8dB @ 800Hz

6 pounds (2.7 Kg)

11.25 inches (W) x 10 inches (D) x 3 inches (H)
285 mm (W) x 254 mm (D) x 76 mm (H)

Amplifier Response
20 Hz - 25 kHz

98 dB (1W @ 1m)

Auto Adjusting Voltage
115 Volts or 240 Volts, 50 or 60 Hz
750 or 1000 Watts

Included Accessories

UL 901 Bass Amp includes a custom rack mount kit, US universal power cable, and EU power cable.