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3 Band NTMB+FL Preamp, 4 Inline Pots, 1 toggle – HR-4.7JFL

4 Pots Inline, 1 toggle: (Volume) (Blend) (Mid) [Mid Toggle] (Treble/Bass Stack) > HR-4.7J/918FL - Active or HR-4.7APJ/918FL - Active/Passive

List Price:

$260.00$270.00

 how to buy

SKU: HR-4.7JFL Category:
SKU: HR-4.7JFL Category:

The NTMB+FL is well known to professionals for its very low noise and precise control. It is a 3-band tone control preamp with fully independent Bass, Mid and Treble controls. The adjustment range is refined for precise control. Often used in fretless instruments for more focused mid control, the FL voice is the same as the original Bartolini TMB from the 1980s.
A professionally pre-wired and fully pre-tested harness saves the time and aggravation of wiring your preamp and pots into your instrument. Wired with our pro-level preamp and premium audio-quality pots and switches, you’ll have smooth control and be ready for years of rugged use. We include battery clips and an output jack for quick installation. All the pots are grounded with a wire that can be connected to the cavity shield or simply cut away if not needed in your installation. Everything is pre-soldered with pro-quality pure copper wire that is double tin plated and protected with semi-rigid insulation so it won’t flop around in the cavity or degrade over time. We use only professional lead-free solder with non-corrosive flux. Knobs are a personal choice, so they are not included with the harness - except where there is a stacked (concentric) pot, we include a ring knob and center knob since they are not as common.

Ordering Details

Model UPC Price
HR-4.7J/918FL 682384506431 $260
3 Band EQ, FL, 4 Pots, 1 toggle Jazz Layout: (Volume) (Blend) (Mid) [250,500,800Hz Mid Toggle] (Treble/Bass Stack)
HR-4.7APJ/918FL 682384504734 $270
3 Band EQ, FL, 4 Pots, 1 toggle Jazz Layout: (Volume with Pull-Bypass Switch) (Blend) (Mid) [250,500,800Hz Mid Toggle] (Treble/Bass Stack)

HR-4.7JFL Technical Details

Preamp Module Size:
1.76" [44.7mm] Long,
1.02" [25.9mm] Wide,
0.54" [13.7mm] Thick
Operating Voltage:
9V or 18V - Prewired for 9V. An additional battery clip is included for 18V wiring.

Gain Control

  • The in-cavity gain trimmer lets you adjust the output level of your instrument. This lets you match output levels from several instruments for consistent response from level-sensitive effects 
  • Gain: 0-12dB

Bass Control

  • Boost or cut your low frequencies up to 5 times the flat signal. The bass frequency is great for E, B, and low F# strings.
  • Bass: +/-12dB@30Hz

Mid Control

  • Thicken or thin your tone with mid control. Mid boost lets you cut through the mix, and mid cut provides great slap tone. Flip the toggle to set the mid frequency to 250Hz, 500Hz, or quickly flip to 800Hz for a solo.
  • Mid: +/-12dB@250/500/800Hz

Treble Control

  • Boost or cut your high frequencies to brighten or darken your tone. The NTMB+FL gives you a constrained control range for precise voice adjustment.
  • Treble: +/-15dB@6.5KHz

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