Infinity FIFTEEN manual Locating a test point

Page 11

Each of the following tracks produces a low-frequency test tone. The range of these tests is from 100Hz down to 20Hz. The frequency of each test is announced before it begins. The first test is the highest frequency (100Hz); therefore, you will be marking the template from right to left. Each frequency point is listed across the bottom of the Measurement Template (this is called the X-axis). See Figure 6 on the previous page. The vertical scale on the left side of the template indicates relative level, in dBs (the Y-axis). The template’s vertical scale matches that of the RSLM bar graph.

Cue Track 4 and Pause II.

From now on, you will want to keep your CD player’s remote control handy.

Press Play ›. As Track 4 plays, observe the level indicated on the RSLM.

EXAMPLE:The test frequency is 100Hz and the level indicated is –2dB. Find the intersection of 100Hz (X-axis) and –2dB (Y-axis). Place a dot at that point. See Figure 7.

Figure 7. Locating a test point

It takes a few seconds for the RSLM reading to stabilize, especially at very low frequencies. Don’t rush. Give each test adequate time for the meter to stabilize.

At the bottom of the bar graph is a green “ON” LED. This LED is illuminated whenever the sound level is below the measuring range of the RSLM. If this occurs during a test, place a dot at the intersection of the test frequency and the bottom frame of the template. See Figure 8.

2

Figure 8. Indicating an under-range test

When finished, press Skip ››I to advance to the next test. Repeat the process described above for Tracks 5 through 26.

When you have completed the 23 measurements, you are ready to analyze the data and make corrective adjustments. The completed Measurement Template will look something like the example in Figure 9.

Figure 9. Completed R.A.B.O.S. Measurement Template

Now connect the dots as shown in Figure 10.

This will make interpretation of the data much easier.

Figure 10.Test example with dots connected

CASCADE MODEL FIFTEEN

8

Page 10 Page 12
Image 11
Page 10 Page 12
Contents Cascade Ii Cascade Model Fifteen Upon completion of any service or repairsRead First Table of Contents Unpacking the Subwoofer PlacementInfinity Cascade Model Fifteen Rear Panel ¡ £ ¢ ∞ § Controls and ConnectionsConnections Set Normal/LFE Switch to LFESet Normal/LFE Switch to Normal Operation Power OnRoom Adaptive Bass Optimization System R.A.B.O.S Rslm Placement Contents of the R.A.B.O.S.Test CDWhen you have completed this adjustment, press Pause Initial System-Level SettingSetting the Subwoofer Test Level Turn the system volume to minimumLocating a test point Width What Does a Parametric Equalizer Do?Completing the Measurement Template FrequencyPlacement of the Width Selector Using the Width SelectorOur example, you would enter 9 in the attenuation field Skip to the Adjusting the R.A.B.O.S. Equalizersection onLevel What You Measure, What to DoExample 3. Peak Adjacent to a Dip Example 2. Two Response PeaksExample of two narrow dips Example 4. Narrow ResponsePosition Adjusting the R.A.B.O.S. EqualizerExample 6. Ideal Response Cascade Model Fifteen R.A.B.O.S. Controls Final System BalanceMaintenance and Service Frequency Frequency Cascade Model Fifteen Specifications
Related manuals
Manual 25 pages 20.38 Kb
Top Page Image Contents