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  #1  
Old 07-12-2014, 01:13 PM
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Default DD1 setting gain testing

Can someone explain gain overlap in regards to the dd1 and the difference in -5, -10, -15? I started writing down numbers last night and see absolutely no difference in the 3 regarding power output.

This is a question a friend of mine has so I just copy/pasted it onto here. Please easy on the rock throwing.
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Old 07-12-2014, 03:11 PM
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Everything I've seen suggested using the -5dB track. Mainly burp guys set with a 0dB track.

Setting with the -15dB track allows you to turn the gain up but you really run the risk of clipping your speakers to death on most music.
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Old 07-12-2014, 04:15 PM
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He says amp output stayed the same regardless of track that was used though. So what exactly are the overlaps purpose?
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Old 07-12-2014, 04:25 PM
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if there are threads on this question can anyone point me in right direction thanks
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Old 07-12-2014, 05:43 PM
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copy paste

Quote:
Gain overlap is a compensation mechanism to account for the fact that we don’t listen to test tones in mobile audio
systems, rather we listen to music. Test tones are great for setting up the input levels on each component of the signal
chain, but test tones are constant levels all of the time. Music has levels that simply are not constant all of the time.
There are loud passages and soft passages in music, and these are constantly changing. Due to this fact, the maximum
unclipped output levels determined by test tones will seem as if the system doesn’t play very loud. Certainly it’s free of
clipping and audible distortion, but it’s not as loud as it seems like it could be overall. This process allows a measured
amount of increase to be implemented without “guessing” by just turning up the gain controls on a random piece of
equipment. Adding extra gain to the signal chain whether it’s at an upstream signal processor or at the amplifier at this
point is a trade-off of benefits and drawbacks. Most people find that there is a good compromise of these trade-offs

When you raise the gain above the levels achieved with a test tone, you will lower the signal to noise ratio of the
system. In this scenario, the trade-off is higher output at maximum levels trading off for more hiss and system noise
with the volume at lower levels. There is always an acceptable compromise.

Additionally, when you raise the gain above the levels achieved with a test tone, you will increase audible
distortion of the system. In this scenario, the trade-off is higher output at maximum levels trading off for more
frequent moments of “clipping” with both the volume and the music at their maximum levels. Check out the amount
of time that there is added distortion in the signal based on the amount of gain overlap added. Once again, there is
always an acceptable compromise.

Add in 5dB of gain overlap to achieve a higher volume with music (rather than test tones). It’s a safe compromise
between slightly increased distortion (Less than 0.1%) and louder output (nearly 5dB). Less critical listeners could
tolerate 10dB of gain overlap, but look what happens to the distortion increase. Some people will easily hear that with
a great set of mid and high frequency speakers (certainly more evident on compressed audio tracks as well). Reserve
15dB of gain overlap for subs, if at all. If you are using this setting, chances are you can go to a bigger amp for better
sounding results at the same volume levels with less distortion and more headroom.

Use the gain overlap tracks on the RTTI/3Sixty set up disc to achieve the gain overlap safely without causing damage to
the speakers. Simply play the same frequency (HP/BP/LP) as before and increase the voltage levels to the same place
the recorded measurements were at 0dB levels for 5dB of overlap. If you use the 0dB tracks to increase the output
voltages to do this, you will almost certainly damage the speakers if not using load resistors.
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Old 07-12-2014, 07:46 PM
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So then i would have to say if he has reached amps full potential regardless of overlap it's safe to assume its time to move up in amp/power.
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Old 07-13-2014, 05:04 AM
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This was originally my question. It came about after trying to get a little more from my amp. I had originally set it up at -10dB and was going to -15 for more power in a burp. So I set up the dd1 and also my fluke meter and recorded the AC voltage out. [email protected] After some tweaking with the deck I got...
[email protected]
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[email protected]
At each gain setting I then upped the amount of signal from the deck with the sub output, adding +1 at a time and writing down the voltage. Regardless of the setting they all rose the same amount at each interval and all reached the same maximum output of 100.7v AC. Which led me to ask what the difference was if output stays the same.
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Old 07-13-2014, 06:22 PM
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You feel you got your explanation or you just going to throw DD1 into a sock drawer lol
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Old 07-16-2014, 06:25 PM
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I reduced the gain to the -5 setting and while it is still loud, it isn't what it was. doesn't want to hairtrick, float anything, or flex as hard. it did a 51.4 sealed sunday which isnt far off from its best sealed score but everything else is off
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Old 07-16-2014, 11:07 PM
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Time for a 10k broham!
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