hz question

[luvinthebass 5,000+ posts]

my hearing range is from 11hz to 22,019hz... anything above that i can't hear, i have my own sound lab where i do audio mastering and because of that i check my hearing about every 6 months... guess im far from norm

i did a test with the NCH test tone software and the farthest i could hear down to was 7 hz

highest up to was 15,000hz

guess my hearin isn't as bad i thought

 

[SQBubble 10+ year member]

i did a test with the NCH test tone software and the farthest i could hear down to was 7 hz
highest up to was 15,000hz

guess my hearin isn't as bad i thought

link to the software plz?

 

[luvinthebass 5,000+ posts]

http://www.nch.com.au/tonegen/index.html

very easy to use

 

[SHiZNiLTi 10+ year member]

If you want to know what your box is tuned to, you can go to ROE and download Hz test tones in fairly small increments. Play a bunch of tones in the 25-40hz region. Wherever your woofer moves the least is close to the frequency to which your box is tuned.

Hmm, thats intersting. I tuned my 7cuft box for my 18" BTL at 32hz because I thought that doing this would help focus on that tuning, but according to this I guess not.

I've ran test tones and at a 30hz tone my sub barely moves, but at 38hz it moves like crazy.

If I wanted to focus on the bringing out the 30hz range what tuning frequncy should I tune my next box?

 

[audioholic 5,000+ posts]

Hmm, thats intersting. I tuned my 7cuft box for my 18" BTL at 32hz because I thought that doing this would help focus on that tuning, but according to this I guess not.
I've ran test tones and at a 30hz tone my sub barely moves, but at 38hz it moves like crazy.

If I wanted to focus on the bringing out the 30hz range what tuning frequncy should I tune my next box?

Just because the cone moves the least at/near tuning does not mean output is the least, just the opposite. The enclosure chokes down on cone motion at tuning, minimizing direct radiating sound from the speaker itself, but the enclosure is also at its most efficient at tuning and its boost in output is the greatest. Net result over all is more output. Yes, speaker moves the least, output is the most, at tuning.

 

[XanderMoser 10+ year member]

If I wanted to focus on the bringing out the 30hz range what tuning frequncy should I tune my next box?

I don't believe you can bring out certain frequencies by choosing a tuning frequency. The lower your tuning frequency, the lower your sub will go at full volume...but the lower you go, the easier it is to bottom out your sub also. So you have to find the right medium.

To boost 30 Hz output, you need an EQ

 

[Lakota 5,000+ posts]

The lower the hz the more it hz and the higher the hz the more it hz your ears

 

[SQBubble 10+ year member]

The lower the hz the more it hz and the higher the hz the more it hz your ears

wtf?

lol?

 

[SHiZNiLTi 10+ year member]

Just because the cone moves the least at/near tuning does not mean output is the least, just the opposite. The enclosure chokes down on cone motion at tuning, minimizing direct radiating sound from the speaker itself, but the enclosure is also at its most efficient at tuning and its boost in output is the greatest. Net result over all is more output. Yes, speaker moves the least, output is the most, at tuning.

Hmm, interesting. I guess the nature of a BTL is to not get that loud at 30hz then because it's definetly alot louder at 38-40hz even though the box is tuned at 32hz. I did feed it 4000watts a couple weekends ago and it did move more at 30hz, but still did sound as profound and powerfull as what I was looking for when compared to how it performs at 38hz. At 38hz it's just chaos.

You'd think that you'd want the woofer to move more at a lower frequency. Maybee if I tune at 28hz the sub will sound better at 30hz?

 

[XanderMoser 10+ year member]

Isn't the frequency that is it tuned to equal to the -3 dB point? I know that porting a box extends the bass response, but also makes the curve sharper. The lower you tune it, the steeper the drop off curve below the tuned frequency.

 

[JimJ 5,000+ posts]

The lower you tune it, the steeper the drop off curve below the tuned frequency.

Not really...

And I doubt anyone saying they can hear under 20Hz (other than Beat) actually has the gear to realistically produce infrasound //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Prove what you're hearing is in fact the fundamental and I'll be duly impressed...

 

[audioholic 5,000+ posts]

Hmm, interesting. I guess the nature of a BTL is to not get that loud at 30hz then because it's definetly alot louder at 38-40hz even though the box is tuned at 32hz. I did feed it 4000watts a couple weekends ago and it did move more at 30hz, but still did sound as profound and powerfull as what I was looking for when compared to how it performs at 38hz. At 38hz it's just chaos.
You'd think that you'd want the woofer to move more at a lower frequency. Maybee if I tune at 28hz the sub will sound better at 30hz?

You are forgetting, the transfer function of your vehicle is also involved. But yes, usually SPL competitors tune a good 6-10 hz below their vehicle's sweet spot.

I don't believe you can bring out certain frequencies by choosing a tuning frequency. The lower your tuning frequency, the lower your sub will go at full volume...but the lower you go, the easier it is to bottom out your sub also. So you have to find the right medium.
To boost 30 Hz output, you need an EQ

Im having a hard time determining exactly what you are trying to say there, but it seems to be that the only way to boost a certain freq like 30hz is with an EQ, which of course is incorrect. Yes, you can 'bring out' certain freqs by choosing your tuning freq. Otherwise, what do you think tuning a ported box does?
The bottoming out comment... what? Excursion will go up drastically below enclosure tuning, if that's what you are referring to. But otherwise, in a ported box the lower the freq, the less the cone moves (until the freq reaches tuning).

 

[XanderMoser 10+ year member]

I realize what I typed was a bit confusing...

What I meant to say is that the capability of a ported subwoofer to produces frequencies below its tuning frequency is very limited. Hence the rumble filter usually employed. Actually, a vented subwoofer will act more and more like an IB sub as it goes farther and farther below its tuning frequency. That's why it's easy to bottom out a sub in a ported box if you don't have a high pass filter in the amp and the tuning frequency isn't extremely low.

Also, I do have a sub that can hit 20 Hz at +- 0 dB and can hit 10 Hz at -10 dB I believe. My dad and I built it. It's for home theater. It is a sealed enclosure with a 12" driver. And the amp has a built in EQ that supplies extra power as it goes under 30 Hz to keep the frequency response curve flat until at least 20 Hz.

 

[hardhitta47 10+ year member]

...Also, I do have a sub that can hit 20 Hz at +- 0 dB and can hit 10 Hz at -10 dB I believe. My dad and I built it. It's for home theater. It is a sealed enclosure with a 12" driver. And the amp has a built in EQ that supplies extra power as it goes under 30 Hz to keep the frequency response curve flat until at least 20 Hz.

Yeah, but's it much different inside a vehicle. His sub is louder at higher than tuning because of cabin gain, or the resonant frequency inside his car. In HT, your sub is in a large room.

BTW, there are subs that can wang well below tuning with authority.

 

[XanderMoser 10+ year member]

Yeah, but's it much different inside a vehicle. His sub is louder at higher than tuning because of cabin gain, or the resonant frequency inside his car. In HT, your sub is in a large room.
BTW, there are subs that can wang well below tuning with authority.

That is true. I just mentioned my HT sub because of the "you can't hear below 20 Hz" thing.

I don't doubt that there are subs that can play below their tuning frequency. But the general rule is that the farther you go below the tuning freq, the less and less damping there is. The sub relies more and more on its suspension to prevent it from bottoming out. So I guess a very stiff suspension would allow a sub to hit harder below its tuning frequency in a ported box. You made a good point.