Alesis 3630 manual

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

Go to page of

A good user manual

The rules should oblige the seller to give the purchaser an operating instrucion of Alesis 3630, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive an instruction in non-paper form; lately graphic and electronic forms of the manuals, as well as instructional videos have been majorly used. A necessary precondition for this is the unmistakable, legible character of an instruction.

What is an instruction?

The term originates from the Latin word „instructio”, which means organizing. Therefore, in an instruction of Alesis 3630 one could find a process description. An instruction's purpose is to teach, to ease the start-up and an item's use or performance of certain activities. An instruction is a compilation of information about an item/a service, it is a clue.

Unfortunately, only a few customers devote their time to read an instruction of Alesis 3630. A good user manual introduces us to a number of additional functionalities of the purchased item, and also helps us to avoid the formation of most of the defects.

What should a perfect user manual contain?

First and foremost, an user manual of Alesis 3630 should contain:
- informations concerning technical data of Alesis 3630
- name of the manufacturer and a year of construction of the Alesis 3630 item
- rules of operation, control and maintenance of the Alesis 3630 item
- safety signs and mark certificates which confirm compatibility with appropriate standards

Why don't we read the manuals?

Usually it results from the lack of time and certainty about functionalities of purchased items. Unfortunately, networking and start-up of Alesis 3630 alone are not enough. An instruction contains a number of clues concerning respective functionalities, safety rules, maintenance methods (what means should be used), eventual defects of Alesis 3630, and methods of problem resolution. Eventually, when one still can't find the answer to his problems, he will be directed to the Alesis service. Lately animated manuals and instructional videos are quite popular among customers. These kinds of user manuals are effective; they assure that a customer will familiarize himself with the whole material, and won't skip complicated, technical information of Alesis 3630.

Why one should read the manuals?

It is mostly in the manuals where we will find the details concerning construction and possibility of the Alesis 3630 item, and its use of respective accessory, as well as information concerning all the functions and facilities.

After a successful purchase of an item one should find a moment and get to know with every part of an instruction. Currently the manuals are carefully prearranged and translated, so they could be fully understood by its users. The manuals will serve as an informational aid.

Table of contents for the manual

  • Page 1

    A L ES I S 3630 Reference M a nu a l[...]

  • Page 2

    1.1 INTRODUCTION Thank you for purchasing the Alesis 3630 Dual Channel Compressor/ Limiter with Gate. This cost-effective gain control device complements any studio with several important features. For more information on the significance of these features, refer to the Appendix "About Compression and Limiting." • Stereo or dual mono op[...]

  • Page 3

    Here are some typical applications for the 3630: • Even out a vocalist's dynamics to compensate for poor mic or vocal technique. • Increase a guitar's (or other stringed instrument's) sustain. • Smooth out bass sounds for a more consistent level. • Prevent peaks common in many source signals, such as drums, from overloading t[...]

  • Page 4

    nels, synthesizers, and other unbalanced signal sources. Microphones and guitars can be used with the level switch set to -10dBV (see below). Guitars with exceptionally low output pickups may require a preamp for best results. The input impedance is greater than 100k Ω . Side chain This stereo jack allows for insertion of other signal proces- sor[...]

  • Page 5

    1.3 HOOKING UP POWER Hooking up power involves the rear panel power jack and front panel on-off switch. Power jack Plug the AC adapter output in here. Use only the AC adapter supplied with the 3630; use of any other AC adapter will void your warranty. To prolong the AC adapter's life, unplug it when not in use (turning the 3630's power sw[...]

  • Page 6

    Threshold (-40 to +20 dBu) Sets the level above which signals will be compressed or limited. Rotating the control clockwise raises the threshold, thus clamping sig- nals at a higher level and reducing the amount of compression or lim- iting. Ratio (1:1 to ∞ :1) Sets the compression slope, which determines how the output signal will change in rela[...]

  • Page 7

    Peak mode. RMS mode automatically adjusts the attack time, depend- ing on the characteristics of the signals being processed. In peak mode , this control sets how fast the limiter's internal circuitry reacts to changes in input level. The longer the attack time, the more of a signal's dynamics are "let through" before the limiti[...]

  • Page 8

    1.5 FRONT PANEL COMPRESSOR/LIMITER SWITCHES Each switch has an in and out position. The legend above each switch shows which status is associated with which switch position. Peak - RMS With peak response, the 3630 responds to signal peaks to insure that these peaks do not exceed a particular threshold. This mode is ideal when using the 3630 to avoi[...]

  • Page 9

    goes into limiting. With the Link switch out, Channels A and B oper- ate independently as two monophonic compressor/limiters. With the Link switch in, Channel A's controls become master controls for Channels A and B, with the exception of the input/output and the +4 dBu/-10 dBV switches which will continue to operate indepen- dently. The stere[...]

  • Page 10

    Threshold to OFF. Turn on all instruments to be gated but do not pass program material through them (For example, turn your microphone on but do not sing through it). Increase the Threshold (clockwise) until the red CLOSE LED comes on. Any background noise should now be eliminated. Example: To remove hiss from a guitar amp signal, set the Threshold[...]

  • Page 11

    Noise Gate Meter (Open or Closed) When the noise gate is closed (i.e., the input signal is below the noise gate threshold), the red Close LED is lit. When the noise gate is open and letting through the input (i.e., the input signal is above the noise gate threshold), the green Open LED is lit. The red Close LED fades from on to off over the time se[...]

  • Page 12

    Keying Application: Ducking A typical use of keying is to lower background music in the presence of narration. This is called ducking because the music "ducks" to get out of the way of the narration. A similar application would be to lower the level of a rhythm guitar while a vocalist is singing. To perform duck- ing: 1. Process the signa[...]

  • Page 13

    Frequency-Dependent Limiting Application: De-Essing Some vocalists and announcers, especially if equalized for more treble, will produce excessive "sibilance" ("S" sounds, concentrated mostly in the upper midrange and treble). In this situation, the limiter would ideally limit the signal only when high frequency "S" so[...]

  • Page 14

    1.9 TROUBLESHOOTING Noisy or "squeezed" sound - Too low a limiting threshold and/or too high a compression ratio can result in such problems as squeezed, un- natural sounds or excessive noise. Remember, limiting lowers the in- put signal's dynamic range. If the input signal has a dynamic range of 60 dB and you apply 15 dB of limiting[...]

  • Page 15

    Heavy distortion - If the +4/-10 switch is set to -10, try setting it to +4. Gate opens but will not close again- This may be caused by improper Threshold adjustment. Reset the gate as explained in Section 1.6, under Threshold . Gate "chatters"- Reduce Threshold level and/or increase Rate control until a smooth transition occurs. 1.10 363[...]

  • Page 16

    1.11 APPENDIX: About Compression, Limiting, and Noise Gating Compression and limiting both affect a signal's dynamic range, although in slightly different ways. This type of signal processing can be used as an effect (e.g., increase a guitar or cymbal's sustain) or for more practical applications, such as avoiding tape saturation or restr[...]

  • Page 17

    AMPLITUDE VS. TIME However, the maximum peak signal level has gone from 100 in the first drawing to 50 in the second drawing. Therefore, the overall signal sounds softer. By adding output gain, we can give the limited signal a peak value of 100 again. AMPLITUDE VS. TIME 16[...]

  • Page 18

    This limited, amplified signal has a much higher average level than the original signal. This is why limited signals can "jump out" at you and have more punch. Commercials, for example, are often heavily limited so that they have as high an average signal level as possible. Radio and TV stations also use limiting to cope with the medium&a[...]

  • Page 19

    The speed with which a limiter responds to the input signal is also im- portant. If the limiter tries to follow every little nuance of music, the sound can be overly "choppy." Often, you'll want the limiter to affect dynamic range over a somewhat longer period of time. The Release control sets this time period. Clamping a signal too [...]

  • Page 20

    Noise Gating To understand a gate's principle of operation, consider a "manual noise gate." Suppose you're listening to an audio signal being processed by a relatively noisy effect. As long as the audio signal is present, its level will generally be higher than the noise, thus masking it. However, when the audio signal goes away[...]