The Quilter Labs Bass Block V803 is a powerful and versatile bass amplifier that combines modern Class-D amplification with the warmth of vintage tube sounds. A robust 800W output ensures exceptional performance across various speaker setups, supported by a quiet, variable-speed fan for reliable, heavy-duty use.

The Bass Block V803 is designed to meet the demands of professional musicians, providing robust performance and flexibility. Whether seeking the precision of modern amplification or the nostalgic tone of vintage tube amps, this amplifier provides high-quality sound and reliable operation in a compact, modern package.

Additional Features: The rear panel offers dual Speakon(TM) Combo connectors for speaker compatibility, a locking AC cord for reliable power connection, and universal AC power support for use worldwide. The XLR Line Out pre-MASTER for consistent signal level regardless of where you set stage power.
User Convenience: Features a MUTE-ACTIVE-PASSIVE switch with a bright LED indicator, and an FX Return that can be used as a stealth input for backing tracks. The headphone output automatically switches from FRFR on MODERN to cab-sim on WARM and Q-TUBE settings.

VOICINGS:
*Modern- This setting duplicates the performance of the Bass Block 802, Our exclusive dual limiter prevents lower strings from bottoming out, even on high BASS settings, without choking or gagging the upper strings. Dynamic range is optimized, with a feeling of "grunt" or "effort" replacing… read more the usual breakup at peak power. The power amp is "tight" with a high damping factor that keeps the speakers under control. Power delivery depends on speaker impedance, with up to 450W into 8 ohms and over 800W into 4 ohms.

*Warm- This position retains the dual limiter system for "bottomless" bass performance, but changes the amplifier impedance to "loosen up" the sound of most speakers, producing a warm "old-school" bass response normally associated with vintage tube amps. The rated power varies from 450 to 500W into either 8 or 4 ohm load, but due to the added voltage swing into resonant frequencies, the overall volume level sounds as big as the MODERN setting.

*QTUBE- This position uses the same amplifier character as WARM, but replaces the limiter system with a tube-like clipping circuit, providing a smooth transition from clean to breakup, similar to classic tube amps. Power at breakup ranges from 450W to 500 W into 8 and 4 ohm loads

INPUT SWITCH:
*PASSIVE- This position has 10dB more gain to match typical passive pickups.
*ACTIVE- This position is padded 10dB relative to PASSIVE, to balance the volume of an active bass with average control settings.
*MUTE- This position blocks the signal prior to the SPEAKER and SIG-OUT jacks, for noise-free instrument changes, with a bright red LED to remind the user that Mute is engaged. The FX LOOP is still active, so a tuner may be used on the MUTE position.

GAIN/EQ:
*GAIN- The GAIN control regulates the overall input volume to the preamp, along with the ACTIVE-PASSIVE switch settings.
*TREBLE- A shelving filter boosts or cuts frequencies starting above 500Hz, reaching full swing at about 2kHz. This controls the "snap" or plucking overtones of the bass strings.
*MIDRANGE- A selective midband filter boosts or cuts a band of frequencies centered at about 250Hz to 1kHz, depending on the Frequency setting. This can cut or boost the "twonk" or "bark" frequencies. Boosts can be used for emphasis, and cuts could help control midrange feedback howl on acoustic bass instruments.
*BASS- A selective 4th order shelving filter adjusts frequencies below 100Hz, acting mainly on the lowest strings of the bass guitar's range. Boosting BASS will produce a deep rounded tone. If pushed into limiting (on the Modern or Warm Voice), the low frequencies are limited separately, allowing the overtones and higher strings to "catch up" with the bass foundation, preserving a sense of effort without bottoming out or choking off the upper strings.
*MASTER- Controls overall out output of the amp. After adjusting your Gain and tone as described above, use the MASTER control to match the overall output power to your speaker's capacity.

INPUTS:
*FLAT- A high impedance input matches both passive and active bass signals with no frequency shaping. All frequencies are treated equally, revealing the natural sound of your bass instrument.
*SCOOP- This input produces an initial tone that is similar to classic "tone stack" EQ sections which have an inherent mid scoop. This input has full bass, leaner midrange, and silkier highs

HIGHLIGHTS:
- Power and Performance: Delivers over 800W to handle any speaker with ease. A high-current Class-D power section that combines old-school dynamic warmth with the efficiency of modern technology.
- Three Unique Amp Modes: The Voice switch provides three distinct amplifier profiles - MODERN ( same system as prior 800 and 802 models, with tight solid-state output and "bottomless" limiter). WARM (tube-type output impedance with the same bottomless limiter), and Q-TUBE (tube-type output impedance with classic tube clipping) - each delivering a unique dynamic response ranging from tight, controlled solid-state performance to lush, vintage tube warmth and overdrive.
- Tone Shaping: A 3-band EQ with four controls (Bass, Midrange with sweepable frequency, and Treble) offers precise tonal adjustments.
- Connectivity and Controls: Includes two high impedance inputs (Flat and Scoop), FX Loop, headphone output with cab-sim, and an XLR Line Out with integral cab-sim and grounding switch. The GAIN control adjusts drive and sensitivity, while the MASTER control matches the output power to various speaker ratings.

Features:

- TWO INPUT JACKS: 1meg, Flat and Scoop, 4V peak
- INPUT SWITCH: Mute, Active, Passive
- GAIN
- AMP VOICE SWITCH: Modern, Warm & Q-Tube profiles
- 4-KNOB EQ: Bass +/- 15dB at 100Hz, Mid +/- 15dB with 250-1K Freq Sweep. Treble +/-15dB at 1kHz.
- EFFECTS LOOP: Buffered, 1K Send, 47K Return, 1V peak signal level
- XLR LINE OUT: 1.4V (+4dBu), 600 ohms balanced
- XLR GROUND LIFT: Ground, Lift Auto
- OUTPUT POWER: Up to 450W at 8 ohms, 800 watts at 4 ohms, 25Hz-15kHz
- FX LOOP (SEND/RETURN)
- HEADPHONE- Connect a quarter-inch stereo plug to the HEADPHONE jack located on the front. Standard 32-ohm headphones will work best but other impedances can be used, possibly with reduced peak level. Volume is controlled by the MASTER.
- LINE OUT
- LOCKING IEC POWER CORD
- UNIVERSAL AC POWER- the amp is capable of running on all known worldwide AC voltages (100-250v)
- SPEAKER CONNECTIONS- Dual quarter-inch and Speakon outlets allow one or two speakers to be Connected

WARNING: Cancer and Reproductive Harm - www.p65Warnings.ca.gov.

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