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Alesis iO2

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Dolphin id:8246 Product SKU:iO2

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Portable 2–Channel 24-Bit/48KHZ USB Audio Interface

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Designed as the ideal Audio/MIDI companion to notebook computer-based recording environments, the iO|2 USB has a compact form factor that can easily fit in a laptop case or small backpack. The iO|2 USB features durable aluminum casing, USB power (eliminating cumbersome external power supplies) and is optimized for minimal laptop battery drain.

The iO|2 provides 2-channels of pristine 24-bit/48kHz audio directly to your computer via the integrated USB interface and features 2 channels of switchable Mic/Line Inputs. And with Hardware Direct Monitoring, you never have to worry about dealing with audio latency while recording.

Small enough to fit in a backpack, but powerful enough to get the job done right, the iO|2 is perfect for musicians on the go.


  • 24-bit, 48 kHz operation with high-end A/D and D/A conversion through integrated USB audio interface
  • 2 XLR Mic inputs with 48V phantom power plus 2 1/4" balanced line inputs that can accept guitar level signals
  • 1/4" balanced Main Outputs
  • 1/4" TRS inserts on input channels
  • 1/4" TRS headphone output
  • Dedicated four segment signal/clip LED meter on both channels
  • Ultra low-latency ASIO 2.0 drivers (with zero-latency hardware monitoring)
  • 24-bit S/PDIF I/O for direct Digital recording
  • MIDI Input/Output
  • USB powered—no external AC power supply necessary
  • Low power usage for minimal laptop battery drain
  • Bundled with Steinberg Cubase LE software


  • Frequency Response:
    • Mic/Line In to SPDIF/USB Out +/-0.1dB Input Gain = minimum
    • Mic/Line In to Main Out (through ADC/DAC) +/-0.35dB Input Gain=minimum
  • Signal To-Noise Ratio (SNR):
    • Mic/Line In (balanced) to Insert Out: 110dB A-weighted, input impedance at XLR or 1/4" jack = 600 Ohms, Input Gain = minimum
    • Guitar In (unbalanced) to Insert Out: 99dB A-weighted, input impedance at 1/4" jack = 600 Ohms, Input Gain = minimum
    • Mic/Line In (balanced) to SPDIF/USB OUT: 99dB A-weighted, input impedance at Mic or LINE jack = 600 Ohms, Input Gain = minimum
    • Guitar In (unbalanced) to SPDIF/USB OUT: 94dB A-weighted, input impedance at 1/4" jack = 600 Ohms, Input Gain = minimum
    • Mic/Line In (balanced) to Main Out (through ADC/DAC): 97dB A-weighted, input impedance at Mic or LINE jack = 600 Ohms, Input Gain = minimum
    • Mic/Line In (balanced) to Main Out (through direct monitor): 95dB A-weighted, input impedance at Mic or LINE jack = 600 Ohms, Input Gain = minimum
  • Total Harmonic Distortion + Noise (THD+N):
    • Mic/Line In (balanced) to Insert Out: <0.001% Input Gain = minimum, 1KHz input signal, Insert Out = 5.7dBV
    • Guitar In (unbalanced) to Insert Out: 0.034% Input Gain = minimum, 1KHz input signal, Insert Out = 5.3dBV
    • Mic/Line In (balanced) to SPDIF/USB Out: 0.003% Input Gain = minimum, 1KHz input signal, Digital OUT = -0.3dBFS
    • Guitar In (unbalanced) to SPDIF/USB Out: 0.034% Input Gain = minimum, 1KHz input signal, Digital OUT = -0.7dBFS
    • Mic/Line In (balanced) to Main Out (through ADC/DAC): 0.005% Input Gain = minimum, 1KHz input signal, Main Out = 5.6dBV
    • Mic/Line In (balanced) to Main Out (through direct monitor): 0.006% Input Gain = minimum, 1KHz input signal, Main Out = 5.6dBV
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Alesis iO2 Reviews


Alesis IO2 Windows 7 (64bit)

Does anyone know whether this works with Windows 7 64 bit?


Alesis io2

Easy to use, incredibly well built and very compact.


I purchased the io2 for use with GB and Logic Express 8, on a 2.4GHz MacBook running OS X 10.5.6. The simple layout, rock solid build and class compliance with 10.5 appealed and the device certainly hasn\'t disappointed.

I was a little concerned about comments regarding compatibility with OS X 10.4, but having seen other users report no issues with 10.5 I took the plunge. The device was recognized instantly and I had no problems getting my DAWs to play nicely with the io2.

Guitars and bass are a breeze, playing/recording like a dream through Guitar Rig 3 with no noticeable latency! I\'ve also had great results recording vocals and acoustic guitar with a T.Bone SC400 condenser. Some may say the preamps are a bit weedy but they\'re fine for my needs and have yielded surprisingly clear and warm results.

Initial problems sending MIDI data (from an old keyboard) were rectified by removing a badly built aggregate device with the OS X \'Audio/MIDI Setup\' utility; most definitely a case of user error on my part. I was helped through this by the Alesis UK tech support line and was chuffed to bits by how helpful they were.

While I\'m unable to vouch for the io2\'s compatibility
with Vista (32 or 63 bit) and can state that it works without a hitch in XP; both natively and running through Bootcamp and a virtual machine.


This thing is built like a tank, with all jacks and connectors being bolted directly to the unit casing, so longevity shouldn\'t be an issue. The casing itself is thick, rigid and far more durable than other interfaces at this price point and I\'ve no qualms about chucking it in my laptop bag for a session away from home. Switches have a positive action and are easily accessible and the status light-strip lets you know if you\'ve left the phantom power on by mistake.

There\'s no discernible noise from the control pots and the \'direct/USB monitoring mix\' control is very useful. The only addition I\'d make would be a couple of guard rails on the top to protect the knobs while in transit (as per the Tapco Link devices).


In summary, I\'ve no reservations about recommending the io2 to anyone looking for an affordable, durable and very versatile interface.

While you should certainly consider the potential issues with earlier versions of OS X (specifically 10.4) and think about how much welly you need from your mic preamps, I\'d be surprised if these were a show-stopper for most users.

Whether you\'re a hobbyist or a seasoned pro who likes to travel light, you\'d do well to check out this device.

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Alesis io|2

Can also confirm that this works perfectly on a Mac (OS X 10.5.5) and also on Windows XP running under Boot Camp.


It does work on macs!

Don\\\\\\\'t listen to the guy above about the mac problem. I\\\\\\\'ve got one of these little boxes, I just plug my perception into it and i get a sweet sound constantly. I\\\\\\\'m running my mac on 10.5.5 and I\\\\\\\'ve no problems what so ever.


Perfect gear for home studio

My first impression of IO2 was bad - I listened through headphone out, with my trusty headphones. Trebles and ~3-10kHz are accentuated, making your ears ache after a few minutes of listening. Turned out it was a mistake to do so. Connect it through your amplifiers s/pdif coaxial input, and you are suddenly in heaven. Sound is perfect. So what is that headphone input good for anyway then?? You can use it to monitor your recording without latency, mix the USB/input signal so you dont need to stress your cpu with monitoring (and anyway, normally this would be unusable due to latency).

There is a small bug that it cannot function if you put your PC to standby and start again, noisy clicks are starting to appear. Just boot your machine or dont allow your PC/Windows to go to standby, and all is well! I dont think Alesis will ever fix this, so its up to you if you can live with this little glitch or not. For me, all the robustness and quality features of this box are more than enough to compensate.

One minus for the bad headphone out, otherwise it rules.


Alesis IO 2 Review

I tried the Alesis IO 2 for a couple of weeks. I never realy got on with it. The instrument to pc responce was very hit and miss and the only time I had any real joy was if I plugged everything in and rebooted, only then would anything register. The guitar/bass worked ok but had no real joy with midi keyboard. I succeeded only once to get a any midi data into the pc but the latency seemed to hugh? The manual was very simple and gave no real explaination as to what does what? Consequently, I spent hours tweaking, switching on and off and pluging/unpluging and got very little in return. The best thing about the this product was the Cubase LE software which was brilliant. The alesis went back I'm afraid. Not very impressed and not very user friendly. Either that or I expected far too much? Sorry about that!

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