Help with subwoofer setup please

Just say your speakers are capable of playing those frequencies, what amplifier do you have? Demands on the amp are greater.

Then issue of low bass from speakers (room) so that to consider. And if you have a good sub, then it's highly likely the subwoofer will play those frequencies better than your speakers.

With your speakers I'd probably set the crossover no lower than 60hz.
 
Frequency Response (-6dB - IEC 268-13)
28Hz - 100kHz

Frequency Response (-6dB - IEC 268-13)
32Hz - 100kHz

There you go. +/-6dB. So, sorry they don't play to those frequncies, someone else more knowledge will be able to get proper figures (think half octave higher)

So my speakers with -/+ 2dB play much lower (and flatter)

"IEC 268-13 attempts to be representative of a domestic listening space, and specifies the room dimensions, reverberation time, and background noise levels"

hmm does that mean room gain is taken into consideration?
 
Last edited:
FurryLemon said:
Because I assumed the spec sheet as being correct.

Why do you a stick up your ass about it??
Click to expand...

I don't think it's me that has the stick tbh.

You came in here offering advice when you don't have a clue what your talking about. Which is why I'm telling you to read the thread so you can get a clue.

You may also want to get some manners at the same time and treat others the same you would like to be treated rather than making posts like the above.
 
hornetstinger said:
Frequency Response (-6dB - IEC 268-13)
28Hz - 100kHz

Frequency Response (-6dB - IEC 268-13)
32Hz - 100kHz

hornetstinger said:
There you go. +/-6dB. So, sorry they don't play to those frequncies,
Click to expand...
someone else more knowledge will be able to get proper figures (think half octave higher)

So my speakers with -/+ 2dB play much lower (and flatter)

"IEC 268-13 attempts to be representative of a domestic listening space, and specifies the room dimensions, reverberation time, and background noise levels"

hmm does that mean room gain is taken into consideration?
Click to expand...



I am very sorry if this question appears rude, it is not meant to.

I just wanted to double check that you do realise the difference between Hz & dB ?

As your statement

hornetstinger said:
There you go. +/-6dB. So, sorry they don't play to those frequncies,
Click to expand...

Implies you don't know the difference.
 
Yes I know thank you, and I am now sure you do not.

The thing is that one frequency say 45Hz can be heard at various intensities (dB) depending upon the amount of power put into that frequency.

The frequency does not change it will always be 45Hz, (45 cycles per second)

Put small power into the item vibrating at that frequency and it cannot be heard.

But put high amounts of power into that same item cycling at that same frequency and you will hear it easily, put huge amounts of power into the frequency and the intensity will be so high it will hurt your hearing, but it is still that same frequency it has not changed.

Lowering or raising the intensity (dB) cannot and does not change the frequency (Hz)
 
Yes I know thank you, and I am now sure you do not.
Click to expand...

LOL. Wrong. A little knowledge is a dangerous thing is a perfect description of yourself.

It seems you aren't aware of what +/- means. It's about measuring a speaker, to plot it's response along the frequency range. Typically a good speaker is flat, as close as possible in dB along it's entire range. Some speakers may be peaky (either on purpose to get a certain house sound) or because they are low quality speakers.
 
hornetstinger said:
LOL. Wrong. A little knowledge is a dangerous thing is a perfect description of yourself.

It seems you aren't aware of what +/- means. It's about measuring a speaker, to plot it's response along the frequency range. Typically a good speaker is flat, as close as possible in dB along it's entire range. Some speakers may be peaky (either on purpose to get a certain house sound) or because they are low quality speakers.
Click to expand...

Yes exactly what I was saying.

25hz at 90dB is the same frequency as 25Hz at 80dB or -10dB from 90 to put in your terms, although it is a less intense vibration, because less power has been put into the vibration.

However it is still the same vibration so cannot be a different note so cannot be an octave, or half an octave different from the original note, which is what you said, it is just either less or more intense vibration, at the same frequency.

And I do believe the "little knowledge is dangerous" applies far more to you than me, as I would hazard a guess most of your knowledge is from google and websites not from in excess of 40 years working in the electronics industry, building amplifiers for far more complicated systems than simple sound making devices, like we are talking about here.
 
Entai said:
Yes exactly what I was saying.

25hz at 90dB is the same frequency as 25Hz at 80dB or -10dB from 90 to put in your terms, although it is a less intense vibration, because less power has been put into the vibration.

However it is still the same vibration so cannot be a different note so cannot be an octave, or half an octave different from the original note, which is what you said, it is just either less or more intense vibration, at the same frequency.

And I do believe the "little knowledge is dangerous" applies far more to you than me, as I would hazard a guess most of your knowledge is from google and websites not from in excess of 40 years working in the electronics industry, building amplifiers for far more complicated systems than simple sound making devices, like we are talking about here.
Click to expand...

hahaha. clueless.
 
hornetstinger said:
hahaha. clueless.
Click to expand...
OR you could just clarify what you meant in the post Entai questioned.

Originally Posted by hornetstinger View Post
Frequency Response (-6dB - IEC 268-13)
28Hz - 100kHz

Frequency Response (-6dB - IEC 268-13)
32Hz - 100kHz

hornetstinger said:
There you go. +/-6dB. So, sorry they don't play to those frequncies,
someone else more knowledge will be able to get proper figures (think half octave higher)
Click to expand...

So my speakers with -/+ 2dB play much lower (and flatter)

"IEC 268-13 attempts to be representative of a domestic listening space, and specifies the room dimensions, reverberation time, and background noise levels"

hmm does that mean room gain is taken into consideration?
Click to expand...

Entai, hornetstinger means that if you were to use the standard +/-3db measurements, the quoted range on those speakers would be something like half an octave higher at the bottom end.

For anybody that doesnt know (and you dont need to be a knob if you do), a speakers frequency response will naturally tail off at either end of the spectrum. That quoted xDB figure is the point where the response is xDB away from the average across the range. so:

Code: 
Frequency Response (-6dB - IEC 268-13)
28Hz - 100kHz

This means that, at 28hz, the response is 6db down from the average. Which is a fair whack. If you were to use 3db instead, that 28hz figure could easily increase to 35hz or somewhere around there which is roughly half an octave which is what hornetstinger was trying to convey. Albeit badly.

and what's with all the speaker willy waving ? It's embarrassing to read.

----------------------------------------------------------------------

nightrider1470, if you're still reading this thread, it's been hinted at a few times but lost in the nonsense above but generally do the following and you wont go far wrong:

turn the sub crossover off or set it as high as possible
set the sub volume control to 50%
run the subs own correction first.
Then run the Amp's.

Running the sub's own correction first will take car of most of the grunt work in try to get the subs response as flat as possible. Not just the frequency response but phase alignment too (v. important). This should make it as easy as possible for the AV amp to integrate the sub with the rest of the speakers.

in regards to setting the crossover point on the av amp after setup is run; Most amps will default to 80hz yes, but not always. Its not a hard rule - it's a recommendation from THX - so don't be afraid to play around with it. You may well find that something lower works better for you. Or you might not :)
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom