Is it bivolt (110-220V)?

No this is strictly "hardwired" into the case, as a US 3-prong (grounded) 110 volt.

can a second instrument be run into it?

It does have two channels #1 takes XLR and 1/4 #2 takes 1/4 .The best part of the amp is to use voice in the vocal channel and the guitar in the second channel. In this config the voice is very very clear and the guitar sound pretty good as well. I would say excellent quality at moderate volume 25 ft in front. Also excellent quality to record . Two guitars and no vocals to me would be a problem as both would suffer but certainly doable at low volume in a small room . Hope that helps. The Battery packs unfortunately deliver about 85% power which is too bad but they do last surprisingly long. I do put a charged set in before a new night.

never measured Db... I use it for a stage amp feeding it to a house sound system..decibels would not be as high as large amp

I assume this is a 15+15?

I own a Roland AC-60. It has two 6 1/2" speakers rated at 30 watts each in stereo. It has a 1/4" mono jack out for a sub woofer.

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AC-40 Acoustic Guitar Amplifier

Product ID: 76073338

Details

Brand
Roland
Colour
Black
Compatible Devices
Guitar
Output Wattage
35
Item Weight
5.3 Kilograms

🎤Anti-feedback mic channel

🎸Dual 6.5-inch speakers

🔊35W crisp stereo power

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€ 1078.63

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Amplify your acoustic vibe with Roland’s pro-grade clarity!

COMPACT PORTABLE - Lightweight 5.3 kg design fits perfectly in your creative workspace or gig bag.
DUAL SPEAKER DESIGN - Two 6.5-inch speakers deliver rich, balanced tones that capture every nuance.
POWERFUL STEREO OUTPUT - 35 watts of clear, room-filling sound to elevate your acoustic performance.
ANTI FEEDBACK TECHNOLOGY - Stay on point with built-in anti-feedback control for clean, uninterrupted sound.
VERSATILE INPUT CHANNELS - Separate guitar and mic/line inputs with precise level controls for seamless mixing.

The Roland AC-40 is a 35-watt solid-state acoustic guitar amplifier featuring dual 6.5-inch speakers, dedicated guitar and mic/line channels with anti-feedback control, and versatile input options. Designed for portability and professional sound quality, it’s ideal for musicians seeking clear, powerful amplification in a compact form.

Specifications

Brand	Roland
Manufacturer	Roland
Model	AC-40
Model Name	AC-40
Model Year	2013
Product Dimensions	36.2 x 26.49 x 24.1 cm; 5.3 kg
Item model number	AC-40
Compatible Devices	Guitar
Amplifier Type	Solid State
Audio Wattage	35
Batteries Included	No
Batteries Required	No
Speaker Output Channel Quantity	2
Includes AC Adapter	No
Manufacturer	Roland
Country of Origin	Switzerland
Item Weight	5 kg 300 g

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