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Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier 

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The Behringer ACX450 amp is a 45W, 2-channel amplifier that features an original 8" speaker for true acoustic fidelity. It includes 2 independent FX ...Click To Read More About This Product

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OVERVIEW

True and natural acoustic guitar sound.

The Behringer ACX450 amp is a 45W, 2-channel amplifier that features an original 8" speaker for true acoustic fidelity. It includes 2 independent FX processors and an ultra-musical, 5-band graphic EQ for each channel plus the revolutionary FBQ Feedback Detection system to reduce feedback in an instant. The guitar amp also comes with a dual footswitch FS112.

FEATURES
  • Powerful 45-Watt, 2-channel amplifier for acoustic instruments and vocals
  • Original 8" dual-cone speaker for ultimate sound reproduction
  • 2 integrated, 24-bit digital FX processors each with 16 awesome effects programs including reverb, modulation, delay, and various effects combinations
  • Revolutionary FBQ Feedback Detection System instantly reveals critical frequencies
  • Dedicated instrument and microphone channels with separate Gain and FX controls
  • Individual 5-band graphic EQ on each channel for awesome sound shaping
  • CD input allows you to play along to your favorite music
  • Dual footswitch FS112 for FX 1 & 2 bypass included
  • High-quality components and exceptionally rugged construction ensure long life
SPECIFICATIONS

Ultracoustic ACX450 Acoustic Guitar Amplifier

  • 17.9"W x 16.3"H x 8.3"D
    21.9 lbs.
Reviews
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Review Snapshot

by PowerReviews
BehringerUltracoustic ACX450 Acoustic Guitar Amplifier
 
4.6

(based on 36 reviews)

Ratings Distribution

  • 5 Stars

     

    (29)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (2)

88%

of respondents would recommend this to a friend.

Pros

  • Excellent sound (12)
  • Warm / comfy (12)
  • Easy to use (11)
  • Portable (10)
  • Good power output (6)

Cons

  • Limited functions (3)

Best Uses

  • Home studio (11)
  • Performances (11)
  • Outdoor events / games (9)
  • Amateur recording (7)
    • Reviewer Profile:
    • Experienced (11), Professional musician (4)

Most Liked Positive Review

 

A lot for the price but some limitations

After reading all the reviews, I decided to take a chance on this amp mainly for playing/singing solo gigs and trying to downsize my rig. It arrived today and I'll give my honest...Read complete review

After reading all the reviews, I decided to take a chance on this amp mainly for playing/singing solo gigs and trying to downsize my rig. It arrived today and I'll give my honest critique (pre-gig).

PRICE: I'm sure there is nothing better in this range, and most people will be satisfied with this purchase.

USE: If you are a professional accustomed to using higher end equipment, this amp will fall short of your expectations unless you employ some additional tweaking. See below for some suggestions.

CONSTRUCTION: Cabinet (closed back, a big advantage for both durability and direction of sound) is very robust and solid, However, it does make this amp weigh more than some would like it to given its small footprint. You definitely want a lightweight hand truck for this and your other accessories.

Front control panel controls are delicate. I would definitely get a custom cover made to protect the fragile 5 EQ band adjusters and knobs for level and click dial-up effects.

Front grill is velcro-ed to the cabinet rather than 4 corner screws- but that didn't seem to be an issue as far as the quality of the seal or any unwanted vibrations.

Only cosmetic criticism is that the back seams of the tan laminated material are not that tight or flush, so you may want to find a matching color to permanently tape them before you start banging it around.

SOUND: This is of course very personal and all depends on the guitar and mike you are using, and the kinds of venues you are playing.

In general, the pre amp stage of the amp is weak for both guitar and mike inputs.

If your acoustic-electric guitar does NOT have on-board controls for boosting overall level (and maybe filling in some of the frequency band gaps not covered by the graphic EQ), then I recommend some kind of pre-amp box like a Tech 21 Paradriver. Even if you don't click it ON to activate the EQ settings, the signal going to the amp is boosted significantly (at least 20db) and will take better advantage of the amp's power, which is considerable. If you DO click and activate the Paradriver EQ, you at least have the ability to dial in some tube warmth and use the parametric midrange modestly.

EQ: The graphic 5-band has its limitations. The range of each band is pretty narrow I think. For both the guitar and mike channels, I found the 12k frequency band virtually useless since there is no tweeter in this cabinet.

So for vocals, if you are using an SM-58 or equivalent workhorse, even pinning the 3.5k and 12k bands will not give you the crispness you are hoping to get from this essentially guitar amp. Still acceptable for small restaurant gigs but not PA quality. The 1k band should stay flat, it is very honky when boosted. The two lower bands could be boosted a bit for the lows, which seem to be no problem for this amp.

So I would try to use/test out a better mike that has a better high frequency response and see if it makes a difference in the high frequencies. BTW, you may want to invest in a simple level booster for the mic preamp stage as well. I used a 1/4" transformer into the same Tech 21 paradriver and it boosted the signal nicely and gave the appearance of a better high end response. Without a boost, I found that the level control at 5-7 was enough volume and it didn't break up.

Guitar sound of course will vary greatly. See above for suggestions.

The anti-feedback buttons for each channel didn't seem to have any effect- this applies both to high end squeal on the mike and midrange wolf tones on the guitar which really need a notch filter to level out. However, I found if you sang and played facing AWAY from the amp and somewhat to the side, both the mike feedback and wolf tones seemed to diminish significantly.

For an 8 inch speaker and small closed-back cabinet, I found the throw of the speaker to be direct but still with some spread to it. I wouldn't call the sound warm, but it's pretty clear. The lack of high end is less of an issue for guitar since most people go for a more natural, less clinky sound. Again, this is where your onboard guitar EQ or outboard EQ device can make a difference.

CONTROLS: Again, they are all delicate and I would very slow and careful when clicking between effects choices. As far as REVERB goes, setting #2 is a small-medium room which works well for the guitar but makes the voice sound boxy and mid-range dominant. I would go with reverb #3 for the voice (large hall) but use just a trace of it, like between 1-2. The other effects like delay seem to be just fine but that's not a need of mine. If it was, I would use an external multi-effects unit that has all those secondary effects.

Probably the biggest drawback/cutback on controls is the LACK OF A LINE OUT (phone jack and/or xlr).

If you want to patch this into a larger PA system, you're going to have to bring an extra mike for the amp. This could have easily been incorporated on the back mini-panel, alongside the CD stereo RCA ins and level control- a nice touch, especially if you are used to patching in your iPod during breaks. or those who use drum machines and other playalong tracks.

I will be using this on a trio gig tomorrow (with bass and drums in a small auditorium, no PA) to give this a real test. If it suffices for that then I'm sure I'll find a way to make it work for solo and duo gigs as an alternative to taking separate cabinet and head.

In summary, Behringer continues to make quality products for very reasonable cost- and this amp is certainly no exception. But it is far from ideal for the discerning musician who wants the best sound possible. If they read reviews on this site dating back over 5 years citing its shortcomings, maybe this could be a killer amp instead of an adequate one. I know at least the detachable power cable was one improvement they made.

The other issue, which is a marketing one, is that this amp is nowhere to be found in-store at GC or any other retail outlet. So you are basically flying blind when you order it. MF does have a great returns policy so if you don't think this amp will work for you, sending it back is not a hassle and you don't pay the return shipping.

VS

Most Liked Negative Review

 

ACX 450

This amp is good for practice and maybe even a small front porch gigs, but OMHO it seems like something high end I would buy at Target or Sears.The sound is good and clear,...Read complete review

This amp is good for practice and maybe even a small front porch gigs, but OMHO it seems like something high end I would buy at Target or Sears.The sound is good and clear, but the mic section had too much feed back (om2 from Audix).The speaker uses what we used to call a "whizzer" cone around the dust cap of the larger speaker cone. So the same voice coil is used for both highs and lows. The high end cant keep up with the lows at higher volume.I prefer a true coaxal speaker which look like the car speakers displayed at Walmart. Two seperate cones with the tweeter centered in front of the woofer, two seperate magnets, and separate voice coil.The effects sound generic and fabricated. At low volume, it sounds really sweet though, I'll give it that.Overall, sweetsounding, clear, crisp bedroom amp, great first amp for the kiddos!

Reviewed by 36 customers

Displaying reviews 1-10

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(13 of 13 customers found this review helpful)

 
4.0

A lot for the price but some limitations

By Alanyari

from Queens, NY

About Me Professional Musician

See all my reviews

Pros

  • Acceptable Sound Quality
  • Easy To Use
  • Portable

Cons

  • Limited Functions
  • No Line Out Or Phones Out

Best Uses

  • Events
  • Live Soloduo Gigs
  • Performances

Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

After reading all the reviews, I decided to take a chance on this amp mainly for playing/singing solo gigs and trying to downsize my rig. It arrived today and I'll give my honest critique (pre-gig).

PRICE: I'm sure there is nothing better in this range, and most people will be satisfied with this purchase.

USE: If you are a professional accustomed to using higher end equipment, this amp will fall short of your expectations unless you employ some additional tweaking. See below for some suggestions.

CONSTRUCTION: Cabinet (closed back, a big advantage for both durability and direction of sound) is very robust and solid, However, it does make this amp weigh more than some would like it to given its small footprint. You definitely want a lightweight hand truck for this and your other accessories.

Front control panel controls are delicate. I would definitely get a custom cover made to protect the fragile 5 EQ band adjusters and knobs for level and click dial-up effects.

Front grill is velcro-ed to the cabinet rather than 4 corner screws- but that didn't seem to be an issue as far as the quality of the seal or any unwanted vibrations.

Only cosmetic criticism is that the back seams of the tan laminated material are not that tight or flush, so you may want to find a matching color to permanently tape them before you start banging it around.

SOUND: This is of course very personal and all depends on the guitar and mike you are using, and the kinds of venues you are playing.

In general, the pre amp stage of the amp is weak for both guitar and mike inputs.

If your acoustic-electric guitar does NOT have on-board controls for boosting overall level (and maybe filling in some of the frequency band gaps not covered by the graphic EQ), then I recommend some kind of pre-amp box like a Tech 21 Paradriver. Even if you don't click it ON to activate the EQ settings, the signal going to the amp is boosted significantly (at least 20db) and will take better advantage of the amp's power, which is considerable. If you DO click and activate the Paradriver EQ, you at least have the ability to dial in some tube warmth and use the parametric midrange modestly.

EQ: The graphic 5-band has its limitations. The range of each band is pretty narrow I think. For both the guitar and mike channels, I found the 12k frequency band virtually useless since there is no tweeter in this cabinet.

So for vocals, if you are using an SM-58 or equivalent workhorse, even pinning the 3.5k and 12k bands will not give you the crispness you are hoping to get from this essentially guitar amp. Still acceptable for small restaurant gigs but not PA quality. The 1k band should stay flat, it is very honky when boosted. The two lower bands could be boosted a bit for the lows, which seem to be no problem for this amp.

So I would try to use/test out a better mike that has a better high frequency response and see if it makes a difference in the high frequencies. BTW, you may want to invest in a simple level booster for the mic preamp stage as well. I used a 1/4" transformer into the same Tech 21 paradriver and it boosted the signal nicely and gave the appearance of a better high end response. Without a boost, I found that the level control at 5-7 was enough volume and it didn't break up.

Guitar sound of course will vary greatly. See above for suggestions.

The anti-feedback buttons for each channel didn't seem to have any effect- this applies both to high end squeal on the mike and midrange wolf tones on the guitar which really need a notch filter to level out. However, I found if you sang and played facing AWAY from the amp and somewhat to the side, both the mike feedback and wolf tones seemed to diminish significantly.

For an 8 inch speaker and small closed-back cabinet, I found the throw of the speaker to be direct but still with some spread to it. I wouldn't call the sound warm, but it's pretty clear. The lack of high end is less of an issue for guitar since most people go for a more natural, less clinky sound. Again, this is where your onboard guitar EQ or outboard EQ device can make a difference.

CONTROLS: Again, they are all delicate and I would very slow and careful when clicking between effects choices. As far as REVERB goes, setting #2 is a small-medium room which works well for the guitar but makes the voice sound boxy and mid-range dominant. I would go with reverb #3 for the voice (large hall) but use just a trace of it, like between 1-2. The other effects like delay seem to be just fine but that's not a need of mine. If it was, I would use an external multi-effects unit that has all those secondary effects.

Probably the biggest drawback/cutback on controls is the LACK OF A LINE OUT (phone jack and/or xlr).

If you want to patch this into a larger PA system, you're going to have to bring an extra mike for the amp. This could have easily been incorporated on the back mini-panel, alongside the CD stereo RCA ins and level control- a nice touch, especially if you are used to patching in your iPod during breaks. or those who use drum machines and other playalong tracks.

I will be using this on a trio gig tomorrow (with bass and drums in a small auditorium, no PA) to give this a real test. If it suffices for that then I'm sure I'll find a way to make it work for solo and duo gigs as an alternative to taking separate cabinet and head.

In summary, Behringer continues to make quality products for very reasonable cost- and this amp is certainly no exception. But it is far from ideal for the discerning musician who wants the best sound possible. If they read reviews on this site dating back over 5 years citing its shortcomings, maybe this could be a killer amp instead of an adequate one. I know at least the detachable power cable was one improvement they made.

The other issue, which is a marketing one, is that this amp is nowhere to be found in-store at GC or any other retail outlet. So you are basically flying blind when you order it. MF does have a great returns policy so if you don't think this amp will work for you, sending it back is not a hassle and you don't pay the return shipping.

(6 of 6 customers found this review helpful)

 
5.0

follow up on this amp

By Foddershock

from Clintwood, VA.

See all my reviews

Ask me a question

Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

could use a line out is my only beef with this amp
Just a follow up on this amp. I've owned it for three years now, and still can't get over the quality. I've played numerous shows, indoor and out and it just keeps on giving. If you're looking for a good sounding, sorta retro looking acoustic amp.....this is it. I tried out one of Marshal's acoustic amps a few weeks ago, and there was no comparison. The Behringer beats it hands down, and weighs about half as much.

(5 of 5 customers found this review helpful)

 
5.0

Good Value.

By els011

from Petaluma, California

See all my reviews

Ask me a question

Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

Again, I would recommend this product. Very good sound & value.
I purchased the Ultracoustic ACX450 Acoustic Guitar amp from MF as I have been interested in this model. I received it yesterday, & after plugging it in (to make sure it worked) it was tested in combat at one of the weekly blues jams I play at. I played bottleneck on my regal resonator & '62 Grestch Clipper, & this amp kept up with other guitars, bass, drums, harp, & keyboards. Some told me I was not loud enough however I was not always playing at full volume. Amp is very clean with little distortion, although that is what I was looking for in an acoustic amp.
I played with it today with my '60 Gibson J45 w/EMG transducer, & a Taylor V-cable to control the volume at the guitar. I am very impressed with the sound of my Gibson though this amp. I have not had a chance to use the microphone channel, however, if it is anything like the guitar channel, then this is a great amp.
Good value, good product.
I was surprised about the front panel being attached with velcro as it is somewhat lose, however, now I notice that the front access is for the speaker, which makes good sense. I am still experimenting with the effects, however, everything sounded very good with my Gibson acoustic.

(4 of 4 customers found this review helpful)

 
5.0

Super Little Amp

By Big Bob

from Pennsboro, WV

About Me Experienced

See all my reviews

Ask me a question

Verified Buyer

Pros

  • Easy To Use
  • Excellent Sound
  • Good Warmth
  • Portable

Cons

    Best Uses

    • Amateur Recording
    • Home Studio
    • Performances

    Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

    Just a fine little amp. Good sound, nice features, plenty for your solo act. Mic channel has its own EQ. I used the amp for a 4 person jam session and it was great. Had to turn it up to 6+, but it is only 45 watts.
    I have a Beringer sound board so I knew this amp would be just as cool. Can't beat it for the price. I'm very happy with it.

    (3 of 3 customers found this review helpful)

     
    5.0

    Excellent in every way

    By Corporal Clegg

    from Virginia Beach, VA

    About Me Experienced

    See all my reviews

    Ask me a question

    Pros

    • Attention To Detail
    • Easy To Operate
    • Excellent Sound
    • Foot Switch Included
    • Good Warmth
    • Portable
    • Useful Effects

    Cons

      Best Uses

      • Amateur Recording
      • Events
      • Home Studio
      • Performances

      Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

      Excellently designed amp for smaller venues or home use. Can of course be miked for larger ones. The effects are very useful and easy. T ried a vew effects for acoustinc and they were overkill or dificult to figure out (like SZoom A3). This amp you don't need any exteral eefects--they are builting but engineered to enhace acoustic sound and not dramatically alter it. And there are dynamic controls for them. Foot swtich included is great benefit. Solid buy for money.

      (3 of 3 customers found this review helpful)

       
      5.0

      It's a great deal!

      By GeneO

      from Florence, S.C.

      About Me Experienced

      Verified Buyer

      Pros

      • Excellent Sound
      • Good Warmth
      • Portable

      Cons

        Best Uses

        • Amateur Recording
        • Events
        • Home Studio
        • Performances

        Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

        I perchased the Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier on 9/12/13 and I am totally amazed with its performance. I am convinced that for the price I could not find anything that can match it. I've used it for practice as well as twice in a restaurant setting with other musicians. My Alvarez AD62SC acoustic guitar sounds awesome through it. I set the amp gain on five and the guitar on the same and found that I had more than enough power. I am still experimenting with the effects and have used the chorus, delay and reverb settings thus far. I have only use a microphone during practices to try it out. With the amp set on three and the guitar set on four with the microphone set on three, it held its own. Not only am I impressed, so are the musicians I play with. I was a skeptic even after reading all the positive reviews. I have never written a review before on anything I have purchased. I felt that this warranted me doing so. I would definitely recommend this amp to any musician looking for that bang for their buck.

        (3 of 3 customers found this review helpful)

         
        4.0

        Great amp the money

        By Rockerduck

        from Marietta, GA

        See all my reviews

        Ask me a question

        Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

        Bass response is good. There is no tweeter on this amp so the sound is more bass to high mids. This renders one equalizer slider almost useless as there is no high frequency to boost. However, it does sound good enough to gig with. Surprisingly, you can play your electric guitar with it too, since there is no tweeter to blow. So low volume gigs where a small amp for electric and acoustic is possible with this. Since I bought this amp to sing and play out of in lieu of my bigger system, I'm going to install a tweeter. The volume of this amp is very good.
        Can't beat it for the price.

        (3 of 3 customers found this review helpful)

         
        5.0

        great amp, great price

        By Foddershock

        from Clintwood, VA.

        See all my reviews

        Ask me a question

        Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

        I've had this amp for 'bout five months now, and have yet to be able to turn it past 5. Absolutely great sound!!! Haven't tried it in an outside environment yet.. The feedback control is great. The effects are awesome. No matter the setting you choose, you can still feel the acoustic sound of your guitar. It seems to be built really well. Just wish it had a line-out.

        (3 of 3 customers found this review helpful)

         
        5.0

        Great Guitar Amp!

        By Walkertexpre62

        from Texas

        See all my reviews

        Ask me a question

        Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

        Very impressed with Behringer 450 amp. Bought mine "used" and when it came....it really had nothing wrong with it. One LED light was flickering a little but I fiddled with the knob a bit and it all works great. Great buy and Musicians Friend has been a real good friend to me! Thanks Musician's Friend. Appreciate what you all do.

        (3 of 3 customers found this review helpful)

         
        5.0

        Heavy

        By Oge

        from Memphis Tn.

        See all my reviews

        Ask me a question

        Comments about Behringer Ultracoustic ACX450 Acoustic Guitar Amplifier:

        I bought this Behringer ACX 450 about a month ago. In my opinion, this is a great amp for the money. unfortunately, l had to send it back. I needed a light amp and this said in the catalog that it weighed just over twenty (20) pounds. In fact it weighs over thirty (30) pounds. This is certainly is not a big deal unless you have some physical restriction and if I could have, I would have kept it The sound was great, the features were really good. You have a lot of control over your sound This of course is important with any amp but I think especially with an acoustic. I personally find it fairly difficult to balance the bass and treble and the Behringer did a super job. I returned it and got a lighter amp but I can't make it sound as good. If weight is not a problem, I highly recommend it.

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