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Author Topic: Itech question  (Read 4867 times)

Jonathan Betts

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Itech question
« on: July 21, 2016, 11:35:43 PM »

When using a IT 4000 for tops and 6000 for subs the voltage input sensitivities and gains are different. 28db is 4.35v on the 6000 and I believe 5.8v on the 4000.  Should you match the gains or voltages when running these amps together. Thanks!
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William Schnake

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Re: Itech question
« Reply #1 on: July 22, 2016, 12:27:02 PM »

When using a IT 4000 for tops and 6000 for subs the voltage input sensitivities and gains are different. 28db is 4.35v on the 6000 and I believe 5.8v on the 4000.  Should you match the gains or voltages when running these amps together. Thanks!
We run IT 4000 and 6000 on speakers and do not match the voltage gain.  You should match the output and voltage gain to the speaker that each amp is driving.

Bill
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Tim McCulloch

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Re: Itech question
« Reply #2 on: July 22, 2016, 12:35:12 PM »

When using a IT 4000 for tops and 6000 for subs the voltage input sensitivities and gains are different. 28db is 4.35v on the 6000 and I believe 5.8v on the 4000.  Should you match the gains or voltages when running these amps together. Thanks!

What speakers are you using?  Is this part of a JBL or other Harman device file?

The *gain* should be the same, thereby causing the amount of amplification to be the same.  Input sensitivity is how much input voltage will cause the amp to reach its full rated output.

If an amp has a greater current output capacity (your 4000/6000 example) it will take more input voltage to reach that greater level presuming the *gain* is the same.

Generally you want the gains the same; if you have the same input sensitivity a larger amp will be louder, sooner, than a lesser-rated amplifier.  That makes things squirrely in setting pass band levels.
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Jonathan Betts

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Re: Itech question
« Reply #3 on: July 22, 2016, 12:46:18 PM »

I'm using SM80/TH 118. I normally run 6000's on the whole rig but need to run the 4000 on the SM 80 today. So set the gains on both amps at 28db and not be concerned with the difference in voltage between the two amps?
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Tim McCulloch

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Re: Itech question
« Reply #4 on: July 23, 2016, 01:19:22 AM »

I'm using SM80/TH 118. I normally run 6000's on the whole rig but need to run the 4000 on the SM 80 today. So set the gains on both amps at 28db and not be concerned with the difference in voltage between the two amps?

Correct
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"If you're passing on your way, from Palm Springs to L.A., Give a wave to good ol' Dave, Say hello to progress and goodbye to the Moonlight Motor Inn." - Steve Spurgin, Moonlight Motor Inn

Jonathan Betts

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Re: Itech question
« Reply #5 on: July 23, 2016, 12:00:50 PM »

Just one of those things I never really picked up on before while  setting up the the system. Does the difference in voltage cause any kind of latency issues?
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Tim McCulloch

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Re: Itech question
« Reply #6 on: July 23, 2016, 01:04:51 PM »

Just one of those things I never really picked up on before while  setting up the the system. Does the difference in voltage cause any kind of latency issues?

No. Why would it?
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Jonathan Betts

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Re: Itech question
« Reply #7 on: July 23, 2016, 01:11:24 PM »

Because someone who I thought who new what they were talking about said it may be an issue. Thanks for confirming!
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Tim McCulloch

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Re: Itech question
« Reply #8 on: July 23, 2016, 03:06:17 PM »

Because someone who I thought who new what they were talking about said it may be an issue. Thanks for confirming!

Latency in the ITechs and HDs are from A\D conversion, sample rate conversion and DSP processing.  The rate is fixed and the amount depends on the input signal - 48k or 96k AES, Cobranet or analog.  This is covered in the owner's manual.
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Ray Aberle

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Re: Itech question
« Reply #9 on: July 23, 2016, 03:42:53 PM »

Because someone who I thought who knew what they were talking about said it may be an issue. Thanks for confirming!
Always good to get a definitive point of reference on how much someone actually knows. ;)

-Ray
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Re: Itech question
« Reply #9 on: July 23, 2016, 03:42:53 PM »


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