Behringer ULTRACOUSTIC ACX1800 Acoustic Guitar Amplifier  

I have the, "Behringer Ultracoustic ACX1800 Acoustic/combo Guitar Amplifier". Well at first this amp was great but,   after a few months I noticed a buzz in channel 2, this turned into a hum, and mid range went out in both channels, so the sound quality went down allot. Now me, Im using this amp in a small room so it isn't turned up very loud, still I figured this amp would last along time, which it didn't all theses problems I listed happened 6 months after I bought this amp,   so for me this amp is a disappointment.

I own this little gem of an amp.  I use it in much the same way as 3 Dog Music, although a little differently.  This amp doesn't have a lot of power output, especially for larger clubs or venues, however this is easily corrected.  I also use it as an acoustic guitar monitor, and I use a good condenser mic in front of the cabinet speakers which then runs through a tube pre-amp and then into the soundboard.  This is where I get the volume needed when volume is needed.  It is very clean, noise-less, and produces a very accurate acoustic signature for each of the guitars I use on stage.  I usually place it to the side of me about 10 feet away and use an amp stand to angle it so it's pointing straight at my head rather than by legs.  It it makes a perfect guitar monitor and running it through a tube pre-amp before it gets to the mixer board, lets me adjust the pre-amp to match the output of the Behringer amp.  It truely gives an accuate, clean, noise-less reproduction of an acoustic guitar.  I could not be happier.  By the way I went through at least a dozen acoustic amps before I got this one and is by far the best one I've owned for acoustic amplification.

I play swing style guitar with a horn band and this amp works well with this.  It provides a nice ? clean ?. acoustic/electric sound.  The effects are suitable and I am very happy with the quality of sound.  I have used the microphone connection only twice but it was sat with the environment.  This is not something to be used if you want a big sound with a vocal group ? for that get a PA system ? but for one or two people with a guitar it does well in quiet, listening settings

I currently own both the ACX900 and the ACX1800. I bought the 1800 because of the extra power output and the adjustable parameters for the effects and also the compressor. I felt very let down by this amp last week when I gigged with it for the first time. When I set up before we got started, I expected to use the 1800 because I sing lead and play lead guitar in a 3 person acoustic trio. I was to let our backup singer use my old 900 and the other guy has a 900 as well. Side by side comparisons lift me shocked at how different these amps are from each other. The 1800 lacked the volume big time and the fullness and bass response were nill. The vocals distort much, much too easily. The compressor works well but nothing could even bring this amp close to the quality of the lower wattage ACX900. I decided to use the 900 for myself at the last minute and set up the 1800 for our female backup singer so the vocals wouldn't distort much but we got a lot of complaints that nobody could hear her. The instrument channel sounds a little better in my opinion on the 1800 but neither channel will give you anywhere near the volume or bass response as the 900. I just purchased another 900 for this weekend's gig and will be returning the 1800.