Dual Subs

[jomari]

Originally Posted by 350gt

reporting in
One question though, i read on def. techs. website that when you use the LFE input on the sub it bypasses the crossover. So it doesnt matter what I have it set at then? and for the JBL, just leave the crossover all the way up?

first off, get a spl meter if you can afford one. its a great investment, and ive never heard anyone say its not worth 50 bucks.

in regards to the LFE input, it wouldnt matter anyways IF you turn your subwoofers crossover setting to its maximum point, meaning if it has a parameter of 30-130hz, you want to set it at 130hz.

your crossover settings on the receiver should dictate what the subwoofer is receiving. this is more important.

a big mistake a number of people tend to do is to have a 'hole' in there LFE frequencies by having crossover points set on both the receiver and the subwoofer.

for example
Receiver: 80hz
Subwoofer: 60hz

you are basically missing the 61-79hz worth of information being filtered out to a void. this is why we want the sub to be set at 130hz or its highest crossover point, and have the receiver do the filtering for you.

does this make sense?

EDIT:

heres a link for our sticky on this topic, created by someone called 'big daddy'

crossover settings and subwoofers

great starter course for reading.

[erict]

Originally Posted by jomari

first off, get a spl meter if you can afford one. its a great investment, and ive never heard anyone say its not worth 50 bucks.

in regards to the LFE input, it wouldnt matter anyways IF you turn your subwoofers crossover setting to its maximum point, meaning if it has a parameter of 30-130hz, you want to set it at 130hz.

your crossover settings on the receiver should dictate what the subwoofer is receiving. this is more important.

a big mistake a number of people tend to do is to have a 'hole' in there LFE frequencies by having crossover points set on both the receiver and the subwoofer.

for example
Receiver: 60hz
Subwoofer: 80hz

you are basically missing the 61-79hz worth of information being filtered out to a void. this is why we want the sub to be set at 130hz or its highest crossover point, and have the receiver do the filtering for you.

does this make sense?

EDIT:

heres a link for our sticky on this topic, created by someone called 'big daddy'

crossover settings and subwoofers

great starter course for reading.

Jomari, not sure but isn't your example supposed to be the other way around

[jomari]

Originally Posted by erict

Jomari, not sure but isn't your example supposed to be the other way around

thanks for the heads up. this is what happens when your at work and doing this at the same time!

erict, can you remove the quoted part to avoid any confusion? thanks!

[GregBe]

Originally Posted by erict

Jomari, not sure but isn't your example supposed to be the other way around

I am sure he meant to have the numbers the other way around, but even in that example, the crossovers are close enough to each other, that they might interact in some strange way, so turn the crossover on the sub all the way up.

[jomari]

Originally Posted by GregBe

I am sure he meant to have the numbers the other way around, but even in that example, the crossovers are close enough to each other, that they might interact in some strange way, so turn the crossover on the sub all the way up.

heres a better example

Receiver: 60hz
Subwoofer is set at 130hz

we have a gap between 60hz and 130hz missing (aside from the roll-offs of course), this is a lot of information being lost.

you guys get the picture.

[GregBe]

Originally Posted by jomari

heres a better example

Receiver: 60hz
Subwoofer is set at 130hz

we have a gap between 60hz and 130hz missing (aside from the roll-offs of course), this is a lot of information being lost.

you guys get the picture.

You did it again

[erict]

Originally Posted by jomari

heres a better example

Receiver: 60hz
Subwoofer is set at 130hz

we have a gap between 60hz and 130hz missing (aside from the roll-offs of course), this is a lot of information being lost.

you guys get the picture.

I guess what I'm trying to say is if you set you're receiver at 80hz and you're sub at 60hz then there will be a hole, right?

[jomari]

hmm. lemme quote bd on this instead, he says it better...

im quite busy at work, and wish i can further this discussion. sorry lads, prioritizing right now...

per BD...

Avoid an Audio Hole
A low-pass crossover frequency will block high frequency sound above the cutoff level. A high-pass crossover frequency will block frequencies below the cutoff level.

Typically, on many new recievers, the LPF ONLY affects the LFE channel (the ".1" channel), not the bass redirected from the other 5 or 7 channels. That is why you normally set it to 120Hz to make sure you receive all the information that the producers intended to put in the LFE channel. However, if the implemented LPF in the receiver affects the redirected bass from the other SMALL speakers, do not adjust the low-pass frequency too far below the high-pass frequency. You could end up with an audio hole in between the low-pass and high-pass frequencies.

However, remember that crossover networks cut frequencies progressively. As a result, if, for example, the high-pass frequency for the small speakers is set at 100Hz, and you set the low pass frequency around 80Hz or 90Hz, you will most likely be ok. If, however, you set the low-pass frequency around 60Hz to 70Hz, then you would most likely end up with an audio hole. Can you really hear the difference? I will leave the decision up to you.

crossover settings

[StimpsonJCat]

The reason the crossover on the sub needs to be all the way up is you want the AVR to determine the crossovers. His last example was backwards.

If you set the crossover on the sub lower than the highest crossover from the AVR you will lose the information between the two. Also you will lose any LFE that is above the subs crossover. You should turn the subs crossover off or set it as high as it will go. (If the sub has a true LFE input it won't use the sub's crossover at all).

[jomari]

Originally Posted by StimpsonJCat

The reason the crossover on the sub needs to be all the way up is you want the AVR to determine the crossovers. His last example was backwards.

If you set the crossover on the sub lower than the highest crossover from the AVR you will lose the information between the two. Also you will lose any LFE that is above the subs crossover. You should turn the subs crossover off or set it as high as it will go.

Ding ding ding! we have a winner!

man, you guys are harsh arent you.

thanks for clarifying that up stimpson...better said that i can...

im at work!

[jomari]

Originally Posted by erict

I guess what I'm trying to say is if you set you're receiver at 80hz and you're sub at 60hz then there will be a hole, right?

yes. an a-hole as bd mentioned it. audio hole.

[erict]

I think it all makes sense now

[Fors*]

Hey, give the "other guy" a break, doing this from work isn't always the easiest thing to do! You start getting....

[350gt]

Originally Posted by jomari

first off, get a spl meter if you can afford one. its a great investment, and ive never heard anyone say its not worth 50 bucks.

in regards to the LFE input, it wouldnt matter anyways IF you turn your subwoofers crossover setting to its maximum point, meaning if it has a parameter of 30-130hz, you want to set it at 130hz.

your crossover settings on the receiver should dictate what the subwoofer is receiving. this is more important.

a big mistake a number of people tend to do is to have a 'hole' in there LFE frequencies by having crossover points set on both the receiver and the subwoofer.

for example
Receiver: 80hz
Subwoofer: 60hz

you are basically missing the 61-79hz worth of information being filtered out to a void. this is why we want the sub to be set at 130hz or its highest crossover point, and have the receiver do the filtering for you.

does this make sense?

EDIT:

heres a link for our sticky on this topic, created by someone called 'big daddy'

crossover settings and subwoofers

great starter course for reading.

Ya this is the one I bought:
http://www.radioshack.com/product/in...ductId=2103667

Just didnt have the patience at the time to play with it.

Okay on the JBL I have it turned all the way up, but on the def. tech. it has a high and a low crossover. Do I turn the high all the way up too? Also what about the varible phase alignment, Do I leave that at 0?

Sorry for all the questions, I read all Big Daddys thread awhile back, but I just get confused.

And BTW I watched part 5&6 if band of brothers and it sounds great. It added a little deeper effect but what I like the most is how my couch shook when the mortars and artillery where blowing up. Wasnt boomy like I expected and barely noticed it was there until all hell broke loose.

[jomari]

Originally Posted by 350gt

Ya this is the one I bought:
http://www.radioshack.com/product/in...ductId=2103667

Just didnt have the patience at the time to play with it.

Okay on the JBL I have it turned all the way up, but on the def. tech. it has a high and a low crossover. Do I turn the high all the way up too? Also what about the varible phase alignment, Do I leave that at 0?

no ones answered this part yet? hmm.

anyways, first off, congrats on your spl meter purchase. at least thats a first step into getting it properly calibrated.

second, im not much of a guru when it comes to subs, but i think i can advise
high pass - 120hz
low pass - 80hz.

i think.

stimpsoncat, fos, and bd can confirm if ever.

again, im at work, so thats an already valid excuse if people wanna play pick on the other guy game again.

[erict]

Originally Posted by jomari

no ones answered this part yet? hmm.

anyways, first off, congrats on your spl meter purchase. at least thats a first step into getting it properly calibrated.

second, im not much of a guru when it comes to subs, but i think i can advise
high pass - 120hz
low pass - 80hz.

i think.

stimpsoncat, fos, and bd can confirm if ever.

again, im at work, so thats an already valid excuse if people wanna play pick on the other guy game again.

Can we have fun again It's all good