The Aguilar DB 680 is a high-end valve-based Bass Pre Amp unit featuring 5x Vacuum Tubes, Dual Parametric EQs and a unique 'deep' control providing low-end boost. The unit exhibits an intensively warm and smooth sound which makes this pre-amp popular with professional bass players.

The sound inherent in the Aguilar DB 680 Tube Bass Preamp unit is warm with a smooth feel. The warmth and sweetness in the tone are produced by 5 vacuum tubes that give the preamplifier 2nd harmonic emphasis. Players will find that the Aguilar preamp responds to their use of dynamics far beyond other models.

Dual Parametric Equalization: Two serially arranged active networks. plus/minus 12 db. One EQ is set up from 180 Hz fully variable to 1.2K with fully adjustable bandwidth (Q), and level controls. The other EQ is set up to be fully variable from 1.3K to 7.5 K, again with fully variable bandwidth and level (boost and cut). By arranging the EQs in this fashion we can offer complete flexibility.

Tube EQ
Treble: Tube driven shelving, plus/minus 12db @ 4 K HZ Bass: Tube driven shelving, plus/minus 12 db @ 40 Hz Bass: Tube driven shelving, plus/minus 12 db @ 40 Hz Deep Switch: 2 position tube driven RLC resonant EQ, fixed at 30HZ Bright Switch: Passive RC premphasis @ 5-7 K Hz
Tube effects loop: Tube parallel effects loop with adjustable send and mix control. Left and right returns for stereo effect units.
Output Interfaces: Two 1/4" jack line level output controlled by the master volume control provides unbalanced tube-buffered output for connection to a power amp.
XLR balanced output: Unlike conventional DI outputs, this balanced configuration allows the player to record directly to tape. No mic-pre is required! The output level has five positions to cover all possible recording and concert situations. They are: -40db pre-EQ, -40 db post EQ, 0db, 2db, and 4 db.
HI and Low 1/4" phone jacks: These provide individual crossover outputs for full bi-amping capability. Each has its' own front panel level control and the crossover frequency is adjustable from 100 Hz to 1000 Hz.
Input Interfaces: Two selectable inputs: Located on the front panel, selectable by front panel switch or by footswitch.
Auxiliary input: Located on the rear panel. The extra input on the rear panel is useful in a permanent studio or live rack set-up where one needs to access the unit from behind.
Input thru: This is used to send the signal from a bass straight through to the input of another bass head (not a power amp). For example, connecting with a vintage bass amp that you want to record with a microphone, while taking a direct signal from the DB 680.
Footswitch: Allows the player to select input one or two. Also on the footswitch is a master mute control which mutes all signal except signal going to the tuner input (an extremely useful feature in live or studio situations).
Tube complement: Two 12AX7A/7025 high-mu twin triodes Three 12AU7 medium-mu twin triodes
Input Impedance: 1 M ohm (passive mode) 47 K ohm (active mode)
Output Impedance: Nominal output = 600 ohm. Balanced output = 75 ohm Crossover outputs = 75 ohm.
Power requirement: 100-120-220-240 VAC 50-60 Hz (internally selectable)
Power consumption: @ 120 VAC: 0.75A, 87.75 W
Rack Size 2 spaces
Weight:17 lbs

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