The Ampeg SVT-4PRO is a high-performance tube bass amp head designed for modern bassists seeking legendary tone and complete control over their sound. It combines classic Ampeg sonic character with advanced features for stage, studio, or touring applications.

With Ultra Lo/Ultra Hi modes, adjustable compressor, and a switchable 9-band graphic EQ, this amp provides unmatched tonal versatility. Bi-amp outputs with selectable crossover frequency allow flexible rig configurations.

• Rackmountable Tube Bass Amp Head for modern performance and studio flexibility
• Power Output: 1200W @ 4Ω (mono-bridged), 900W @ 8Ω (mono-bridged), 2 x 600W @ 2Ω
• Extensive Tone Shaping: 3-band EQ plus Midrange Frequency control (5 voicings)
• Switchable 9-Band Graphic EQ: acts as footswitchable second channel with volume boost for solos
• Ultra Lo & Ultra Hi Modes plus Bright switch for enhanced tonal definition
• Built-in Adjustable Compressor for sustain and focus
• Comprehensive Connectivity: speakON, 1/4″ Speaker, Preamp, Bi-Amp, Tuner, XLR Line Out, TRS Line Out
• Crossover Frequency Control for bi-amp setup
• Switchable Effects Loop for external pedals and rack effects
• Heavy-duty construction with reliable tube preamp section
• Legendary Ampeg tone trusted by professionals worldwide

• Type: Rackmountable Tube Bass Amp Head
• Wattage: 1200W @ 4Ω / 900W @ 8Ω / 2 x 600W @ 2Ω
• Channels: 1 + Switchable 9-band EQ
• Preamp Tubes: 3 × 12AX7
• Power Amp: Solid-State
• Controls: Mute, -15dB Switch, Gain, Compression, Ultra Hi, Ultra Lo, Bass, Midrange, Mid Frequency Selector, Treble, Bright, EQ Switch, Effects Bypass, Limit Defeat, Master, Volume, Crossover Frequency
• Output Impedance: 4Ω / 8Ω / 2 × 2Ω
• Effects Loop: Switchable
• Inputs: 1/4″ Instrument, 2 × 1/4″ Power Amp
• Outputs: 3 × speakON, 4 × 1/4″ Speaker, 2 × 1/4″ Preamp, 2 × 1/4″ Bi-Amp, 1 × 1/4″ Tuner, 2 × XLR Line Out, 2 × 1/4″ TRS Line Out
• Dimensions (HxWxD): 5.6 × 19 × 15.5 in
• Weight: 17.9 kg

• Used by professional bassists including Tony Levin and Cliff Williams (AC/DC)
• Perfect for stage, studio, and touring applications
• Rackmountable design for flexibility
• Legendary Ampeg tonal character and reliability