Alesis 820 dsp manual




















I had a pair of refurb Truth as fail on me and they wont be in stock for a while. Would the Prolinear non-dsp be a good option for a bit more money? Anyone else? I work at a sound company which contains both a great recording studio as well as a great vintage music store - among other things Clients love it when I tell them they can use any guitar, bass, amp, keyboard, etc. Anyhow, in my experience, Alesis' newer 's are a much better sounding box than the 's or 's.

Tried to like the 's but they were the least helpful to me over the other 3 pairs I have in making mix decisions. There's a lot of cloudiness in the mids that I really dislike. Monkey Man. One of my monitors just failed; instant "stop". No symptoms bangs, cracks, smoke etc. Took it apart and it looks like what I think is a resistor, labelled RT1 on the board not the DSP board , that's failed.

It's broken in half and I couldn't see anything printed on it. So, I took the other speaker apart and its equivalent resistor is crumbling at its edges, also no printing can be seen.

Can't create a support ticket at Alesis 'cause the product's not in the pop-up menu. Contacted Full Compass Systems in WI 'cause they say they do Alesis repairs but no luck - they don't have a service manual or parts.

Searched online for a service manual but can find nothing. I'm hoping someone can tell me what to buy to replace these parts or at least point me to the service manual; I should be able to figure it out from there I'm hoping. The system works very well, and is entirely intuitive to operate, and although the resolution of the frequency response chart on screen doesn't look too promising, the EQ parameters can actually be adjusted with reasonable precision and in real time.

Hugh Robjohns. Photo: Mark Ewing The only 'accurate' sound in these speakers is the first preset, which is set to be as flat as possible, and in my control room it sounded pretty much right. The mid-range was also open and detailed, while the high end was smooth and open, due in part to the use of soft-dome tweeters. Overall the stereo imaging was very good, and the mix was presented with depth as well as width —something you don't always get in this price range. The other presets are caricatures of other well-known speakers, and were actually more subtle than I expected.

However, while these are fine for second-checking mixes, I wouldn't actually mix using any of them. They can only be approximations, because there's much more to the way a speaker sounds than its frequency response — something that the manual has the good grace to point out.

This brings up the question of what the user is expected to program into the user memories. Without expensive test equipment and expertise, it's impossible to make meaningful room compensation adjustments, and even then these tend only to affect the bass roll-off to compensate for room boundary effects.

In fact I thought it was rather remiss of Alesis not to build in presets for the usual whole-space, half-space and quarter-space monitoring environments, as these are arguably far more useful than simulations of things like ghettoblasters and AM radios. Material with a heavy bass content can cause the clip indicators to flash at what some people might consider to be modest listening levels, but in reality the speakers are adequately loud for nearfield use, as prolonged exposure to high sound levels is not only potentially dangerous to your hearing, but also distorts your short-term listening perspective, leading to unreliable mixes.

While clearly built to a price, the Prolinears are good-sounding speakers that tell you what you need to know about a mix, but if like me you feel you can only trust them in the flat position, I suggest you choose the lower-cost, non-DSP version. As I pointed out earlier, I think Alesis have missed out by not building in some standard environmental correction presets, as, in my experience, most users will make their monitoring environments far, far worse if they try to make any EQ adjustments on a purely subjective basis.

Where DSP-linked speakers really come into their own is for surround work, where it should be possible to control the level of all the speakers in a system from one place. Ideally this would be an infrared remote control, but Alesis haven't included this feature. However, you can set the EQ and trim levels of all speakers simultaneously from the main speaker's DSP panel, or from a computer. As you may have gathered, I have some reservations about the benefits of DSP monitor equalisation in the hands of musicians who, in the main and I include myself here!

However, if you select the flat position and treat them as 'normal' monitors, the Alesis Prolinear DSPs compare well with anything in the same price range and are able to provide adequately accurate nearfield and midfield monitoring in a typical project-studio environment.

Of course if you're going to do that, you may as well save money and buy the non-DSP version instead. Similarly, if you want to work at higher sample rates, the non-DSP or version is better suited, as there are no converters to limit the bandwidth of the signal. They sounded comfortable from the moment I powered them up and, despite their detailed, revealing sound, they weren't harsh or aggressive — I could have mixed on these all day.

Even without the DSP, these are good speakers at the price. If you have applications for their DSP capabilities, so much the better, although it's easy to make your monitoring less accurate rather than better unless you know exactly what you are doing.

Next Page. Page 4 Table Of Contents Mechanical Page 5: Welcome Introduction Welcome! Since , we've been designing and building creative tools for the audio community. We believe in our products, because we've heard the results that creative people like you have achieved with them. Whether you are an experienced studio technician or a practicing musician, these simple diagrams and explanations can help you quickly get your ProLinear DSP connected to a line level output source e.

Page 8 Introduction This page intentionally left blank This allows all types of audio sources to be used, from stand-alone CD players to professional mixers. Attach the other end to one of the serial ports on your computer.

This will bring up the License Agreement window. It is possible to specify whether the software may be used by anyone who uses the computer, or just you. Again, the software suggests an appropriate group. If you wish to use an existing group, simply browse the list and select it with your mouse.

Page Description Of Modes A description of each of these modes is on the following pages. From here you may select one of the eight preset or eight user-defined programs.

It is also where you will find the Gain Trim parameter, which is discussed on the next page. Page 18 Program mode will take the unit back to Preset Program 1. The ProLinear DSP will remember which Program was last selected when the unit was turned off and recall it when the unit is turned on again.

What are Channels? When two or more ProLinear DSP speakers are connected When two or more ProLinear DSP speakers are connected through their serial ports, it is possible to control them through their serial ports, it is possible to control them independently or as a group or as several groups.

After you have created the EQ curve you want, these settings can then be saved to one of the eight User Program locations. Page Input Level Mode In addition to allowing you to achieve maximum signal integrity for an individual speaker, Input Level mode can also be used: To be certain that all ProLinear DSP speakers in the system are at the same level, and To be certain all speakers are operating at an optimal signal-to-noise ratio SNR.



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