natu-reverb AC-1b for acoustic bass

Sale price¥16,500

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Shipping within Japan : 890JPY
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✔ Want to enjoy better sound at home
✔ Want to make the most of the original acoustic sound
✔ Don't want to deal with complicated equipment setup
✔ Want to experience rich sound easily

A new item was born to fulfill such selfishness.(Patent No. 7174457)
"natu-reverb" is a new type of reverb that creates a pleasant reverberation from within the instrument without using electricity.
Anyone can easily attach it with magnets, and there is no need to modify the instrument or install pickups.


Installation instructional video

■ Differences from acoustic guitars

The bracing inside the body of acoustic basses is often higher than that of acoustic guitars, and when a conventional AC-1n is attached to an acoustic bass, it sometimes interferes with the bracing.
Therefore, this product is designed to accommodate the internal structure of an acoustic bass by lengthening the legs by 5 mm.
Please try not only mounting to the top, but also mounting to the back.

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[Compatible instruments]
Accommodates acoustic basses with circular sound holes.
However, it may not be possible to attach it to instruments with a sound hole diameter of 7 cm or less or a side height of 7 cm or less.
In addition, if the instrument has an electric acoustic function, it is necessary to avoid the internal wiring when installing.

[body size, weight]
Size: 13.3cm x 5.3cm x 5.0cm (vertical and horizontal height)
Weight: about 95g
Shipping weight: about 500g

[What is included in the product]
AC-1b main unit, magnet parts set, instruction manual, special case

What is "natu-reverb" ?


Pleasant sound comes from within

The natu-reverb is a patented spring reverb that adds richness to acoustic guitars, classical guitars and ukuleles.

A natural analog reverb is generated from inside the instrument , so you can enjoy a pleasant performance from the moment you pick up the instrument.​

natu-reverb is an item for those who want to cherish the raw sound of acoustic instruments.

Which is more important, the amp sound or the raw sound?

The sound coming out of the amplifier and the raw sound from the instrument body.

Of course, both are important, but since it's an acoustic instrument, I still want to enjoy the live sound. Also, at home, you probably spend a lot of time listening to live sounds .

Would you like to enjoy your usual performance more by upgrading the live sound ?

And analog, not digital, reverb is best for live acoustic instruments.

Feel free to enjoy the sound of the stage at home

Unlike digital reverb that adds reverberation to the sound picked up by the pickup, the natu-reverb adds reverberation to the instrument itself , resulting in an overwhelmingly natural reverb.

Would you like to experience the sound of a concert hall in your usual room?

From beginners to advanced players, this is the simplest and most familiar item for those who want to enjoy the sound of wood on acoustic instruments.