Programming Pitfalls

Question 1

Do input levels match the LTASS values?

Answer 1

Yes
Loud speech signals are 12 dB louder than the LTASS, therefore the top of the speech envelop represents loud sound
Soft speech signals are 18 dB softer than the LTSS, therefore the bottom of the speech envelope represents soft speech

Question 2

Are bands adjusting the entire speech envelope?

Answer 2

Yes

Question 3

Are channels either adjusting the top or bottom of the speech envelope?

Answer 3

Yes

Question 4

Does the LTASS change when the envelope is changed?

Answer 4

Yes
The LTASS is just the average

Question 5

Should you disregard targets that fall below the threshold?

Answer 5

No
As long as the signal falls in the envelope, it can be heard some of the time
An LTASS represents an averaged signal
The upper intensities of the speech envelope may be audible when targets falls below a threshold

Question 6

Should you adjust the bands for multiple intensities?

Answer 6

No
The speech envelope might be raised too much
Need to start over and only adjust one band

Question 7

Should we adjust the moderate input level (65 dB) channel?

Answer 7

No, its not recommended for initial fit
Can unequally adjust the compression ratios between the loud and moderate and the moderate and soft
Never recovers after this adjustment

Question 8

Should you use a small frequency range when adjusting to a target?

Answer 8

No
Begin by selecting the broadest range possible Only select a narrower frequency when you’re close to completing an intensity
Don’t forget to select all the low frequencies and all the high frequencies if the range is near the edges

Question 9

Should you increase gain without observing an increase in REM?

Answer 9

No, stop adding gain
Gain added is not showing up in the ear canal (slipping out with slit leak)
Use the back arrow to go back to where you started

Question 10

Can MPO headroom limitations result in unintentionally high compression ratios?

Answer 10

Yes
The loud sounds won’t be amplified any more, but the moderate and soft sounds will still be (really small compression ratio)
Gain adjusts in some areas but not all
Results in more linear responses

Question 11

Do frequency ranges overlap with one another?

Answer 11

Yes
Adjustments made to one frequency could pull adjacent frequencies up or down too

Question 12

Should you ignore compression ratios within each frequency range?

Answer 12

No
There should be similar compression ratios across all frequencies
Dramatic CR changes causes distortion