DMM help

[Trey803 5,000+ posts]

Will it make a difference when setting an amplifier using a DMM for 2 way components as compared to a 1 way subwoofer. Which tone should I use?

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[Trey803 5,000+ posts]

I want to use the dmm to set the amp that runs my components

 

[acold7dusta 10+ year member]

same way as a sub, just play a 150 hz test tone

(or something over the x/o point)

 

[Trey803 5,000+ posts]

What level of test tone should i use.

 

[kicker06 10+ year member]

People say to play a 1000hz tone.

 

[Trey803 5,000+ posts]

What would be thee diference in test tone frequency, and what would be the difference in test tone level I.E. 0db -3 db -6 db -10db....

 

[Frankensuby 10+ year member]

What would be thee diference in test tone frequency, and what would be the difference in test tone level I.E. 0db -3 db -6 db -10db....

I've seen for Sub channel, go 50HZ, for components 1k Hz.

Simple as this: Your sub generally cover from it's basement HZ response to about 125 (a little high), so you should test with a tone withing the mid range of that point (generally 50) because it won't respond to anything else.

For components, the 1k HZ range is where componenets easily play. I personally do not know if the channel should be tested twice though, one to check Midbass driver response and then one to check tweeter. It most likely is a balance between these two.

As for your 0db, etc.... If you read the setting sticky at the top, it explains. If you are new to this, you should just stick to 0db (I believe) to prevent damage to audio equipment. Anything outside of this is taking a risk if you do not know tuning or your equipment well, and can lead to equipment damage.

As stated, read the sticky at the top. This will have much more detailed and complete information.

 

[thch 10+ year member]

I want to use the dmm to set the amp that runs my components

why?

i suggest disconnecting the speaker and turning off filters. set the gains as normal (when using dmm).

then put the speakers back on, put on the highpass, and actually set gains. or change levels on the HU. whatever you want to do to perform the "volume matching" that traditionally was handled by gains.

tune for 15 minute intervals over the course of a week. longer testing can be done at moderate volumes.

 

[lincolnls 10+ year member]

same way as a sub, just play a 150 hz test tone(or something over the x/o point)

you are wrong, if you are using a DMM you need to use a 60hz tone

the reason you use a 60hz tone is becasue a DMM is set to measure for house current, whihc operates at 60hz.

you can use any tone if you are using a RMS DMM, as it automatically senses the freq and adjusts accordingly

you mentioned crossover points? doesnt have anything to do with it. he is tuning the amp not the components.

he wants to make sure he gets the right power to them.

use the ohms law when finding the correct voltage

 

[lincolnls 10+ year member]

I've seen for Sub channel, go 50HZ, for components 1k Hz.
Simple as this: Your sub generally cover from it's basement HZ response to about 125 (a little high), so you should test with a tone withing the mid range of that point (generally 50) because it won't respond to anything else.

For components, the 1k HZ range is where componenets easily play. I personally do not know if the channel should be tested twice though, one to check Midbass driver response and then one to check tweeter. It most likely is a balance between these two.

As for your 0db, etc.... If you read the setting sticky at the top, it explains. If you are new to this, you should just stick to 0db (I believe) to prevent damage to audio equipment. Anything outside of this is taking a risk if you do not know tuning or your equipment well, and can lead to equipment damage.

As stated, read the sticky at the top. This will have much more detailed and complete information.

you cpoulfdnt be more wrong on the test tones, it has NOTHING to do with what you are going to rum the amp at, it has to do with ohms law.

you tune for 60hz, becasue that is what the DMM is set to measure at

 

[XTRProBoy 10+ year member]

you are wrong, if you are using a DMM you need to use a 60hz tone
the reason you use a 60hz tone is becasue a DMM is set to measure for house current, whihc operates at 60hz.

you can use any tone if you are using a RMS DMM, as it automatically senses the freq and adjusts accordingly

True and false. You do want to use a True RMS meter to get an accurate measurement. However a non TrueRMS meter does not measure AC at a fixed 60Hz in most cases. Usually one of two methods are used to measure AC voltage on a non-RMS meter. One is by rectifying the wave, the other is by displaying an average voltage (average voltage is not RMS by the way).

So yes you do want to use a True RMS meter but no it's not measuring at fixed 60Hz if it isn't True RMS.

 

[sqhertz 5,000+ posts]

what about measuring a bridged sub on a two channel?

one probe in ch 1's terms and the other in ch 2's?

 

[luvinthebass 5,000+ posts]

i have always used a 60 hz tone with sub amps and 1 khz with components