Choosing add-on gear for guitars basses can get confusing fast because these items solve different problems: direct connection, tone shaping, distortion, and instrument pickup. The right pick depends less on a single "best" product and more on where your signal chain needs help. A passive DI box is not trying to do what a distortion pedal does, and an upright bass pickup system is a very different purchase from a stage EQ/DI. Use the comparison below to narrow the role first, then decide how much control, complexity, and cost make sense for your setup.
Quick take
- Dolamo D-7 Professional Passive DI Box Direct Injection XLR 1/4\" Guitar Bass is the simple connection pick for players who want a passive DI with XLR balanced output and 1/4-inch input/thru connections.
- Pro Co Sound FATRAT Distortion Pedal with Selectable MOSFET Clipping and Thic is the drive-focused choice, with selectable RAT or MOSFET clipping and a FAT selection aimed at a thicker tone.
- Fishman PRO-PLT-301 Platinum Stage Acoustic Guitar EQ/DI + 9V Power Supply fits players who want EQ, DI output, sweepable mid control, phase control, and a power supply in one acoustic-oriented package.
- K&K Sound Bass Master Pro Pickup System (Does not Include bridge is the specialized upright bass option, combining multiple transducers with a two-channel preamp.
Listed price comparison
The listed range runs from $29.95 to $455, so the lowest listed price is about 93% below the highest. That spread matters because the products are not just variations of the same accessory; they cover very different roles in a guitars basses signal chain.
| Product | Listed price | Price bar |
|---|---|---|
| Dolamo D-7 Professional Passive DI Box Direct Injection XLR 1/4\" Guitar Bass | USD 29.95 | |
| Pro Co Sound FATRAT Distortion Pedal with Selectable MOSFET Clipping and Thic | USD 115.95 | |
| Fishman PRO-PLT-301 Platinum Stage Acoustic Guitar EQ/DI + 9V Power Supply | USD 201.95 | |
| K&K Sound Bass Master Pro Pickup System (Does not Include bridge | USD 455.00 |
Decision matrix
| If your main need is... | Start with... | Why it fits |
|---|---|---|
| Sending an instrument signal to a mixer or audio interface | Dolamo D-7 Professional Passive DI Box | Passive DI design, XLR balanced output, 1/4-inch input, and 1/4-inch parallel thru output are all centered on direct connection. |
| Adding distortion and switching clipping character | Pro Co Sound FATRAT Distortion Pedal | The title and description focus on distortion, selectable MOSFET clipping, stock RAT-style clipping, and a FAT selection. |
| Shaping acoustic instrument tone while also using DI | Fishman PRO-PLT-301 Platinum Stage Acoustic Guitar EQ/DI + 9V Power Supply | It combines EQ/DI functions, sweepable mid, low-frequency filter, phase invert switch, volume boost, and balanced DI. |
| Outfitting an upright bass with a pickup system | K&K Sound Bass Master Pro Pickup System | It is described as an upright bass pickup combination system with Double Big Twin, Bass Max, and a two-channel preamp. |
Concise product notes
Dolamo D-7 Professional Passive DI Box Direct Injection XLR 1/4\" Guitar Bass
The Dolamo D-7 is the most straightforward choice here for a player who wants a passive direct box rather than an effect or pickup system. Its appeal is practical: an XLR balanced output, 1/4-inch input, and 1/4-inch parallel thru output make it suited to basic instrument-to-mixer or instrument-to-audio-interface routing. The listed new condition and compact metal-housing description also point toward a simple stage or studio utility role. The limitation is that it is not a tone-shaping unit; the description emphasizes passive DI connection, not EQ, boost, clipping, or pickup blending controls.
Pro Co Sound FATRAT Distortion Pedal with Selectable MOSFET Clipping and Thic
The Pro Co Sound FATRAT is the one to look at when the goal is distortion rather than clean signal routing. It centers on selectable stock RAT or MOSFET clipping circuits, plus a FAT selection for a thicker tone, so it gives the player more than a single fixed distortion voice. The description also mentions operation from nine to 18 volts of DC power and a socketed op-amp for users who want chip-swapping flexibility. Its tradeoff is focus: it is listed as a distortion pedal, so shoppers needing balanced DI output, acoustic EQ, or an upright bass pickup system should look elsewhere.
K&K Sound Bass Master Pro Pickup System (Does not Include bridge
The K&K Sound Bass Master Pro is the specialized pick in this group because it is aimed at upright bass rather than general guitar pedalboard use. The system combines a Double Big Twin bridge transducer, a Bass Max wing transducer, and a two-channel preamp, giving the player separate volume controls and internal gain, bass, and treble trim controls for each channel. That makes it the most complete bass-specific setup among these four. The clear limitation is also in the title: it "Does not Include bridge," and its role is narrower than a general DI or effects pedal.
Fishman PRO-PLT-301 Platinum Stage Acoustic Guitar EQ/DI + 9V Power Supply
The Fishman PRO-PLT-301 Platinum Stage is the middle ground for a player who wants more control than a plain DI box but does not need the upright-bass-specific K&K system. It brings together a Class-A preamp, 4-band tone control, sweepable mid, adjustable low-cut filter, phase invert switch, volume boost, and balanced DI output. The included 9V power supply in the title is another concrete reason to consider it as a bundled EQ/DI choice. Its limitation is that it is not a distortion pedal and it is not described as a pickup system; it is mainly about EQ/DI tone shaping.
How to choose by signal-chain role
Start by deciding whether your current problem happens before, inside, or after the instrument signal. If you already have a pickup and you simply need to send a signal cleanly to a mixer or interface, the Dolamo D-7 is the leanest fit because its features revolve around direct injection and balanced output. If your clean signal is already handled and the missing piece is gain texture, the FATRAT belongs in the conversation because its key controls are clipping and thickening options.
For acoustic-oriented players, the Fishman Platinum Stage sits in a different lane. Its EQ/DI design gives you more sound-shaping tools than a passive DI, especially with sweepable mid and low-cut filtering. It is better matched to a player who wants control over tone and output format in one unit rather than a single-purpose utility box.
The K&K Bass Master Pro should be treated as an instrument-system decision, not just a pedalboard purchase. Its Double Big Twin, Bass Max, and two-channel preamp setup are aimed at upright bass pickup blending and tonal adjustment. That makes sense only if the instrument and intended role match that specialized design.
Final recommendation
For the simplest direct-connection need, pick the Dolamo D-7 Professional Passive DI Box Direct Injection XLR 1/4\" Guitar Bass at USD 29.95; the passive DI format and XLR balanced output make it the clearest utility choice. For distortion, choose the Pro Co Sound FATRAT Distortion Pedal at USD 115.95, especially if selectable RAT/MOSFET clipping and the FAT selection are the features you want.
If you want EQ and DI in a more control-heavy acoustic setup, the Fishman PRO-PLT-301 Platinum Stage Acoustic Guitar EQ/DI + 9V Power Supply at USD 201.95 is the stronger match because it combines tone controls, phase control, boost, and balanced DI. For upright bass players looking for a pickup combination system, the K&K Sound Bass Master Pro Pickup System at USD 455.00 is the most specialized option, with multiple transducers and a two-channel preamp. The broad price spread mainly reflects role: utility DI, distortion, acoustic EQ/DI, and upright bass pickup system are four distinct purchases.