Help Blending Sub with Full Towers

[sholling]

In bypass mode, that setting doesn't do anything so you are fine there.

He may be referring to the LPF of LFE which is a setting unique to Onkyos. If that's what he is setting then 120hz is correct.

 

[GranteedEV]

He is correct..

I have it hooked up to the Sub Out. The Subs Xover is turned off, the Volume level is set on about "4", 0' phase.

It just seems unnatural to set my towers to small... But I think I understand why, they only go down to 60Hz.

It sounds like I did everything correctly, Ill switch my speaker settings to small, and set the sub freq to 120Hz.

I watched Toy Story 3 last night, It sounded really great with the settings i have now (speakers set to large) except during explosions and other "bass intensive" parts, I could hear the towers working to hard... I am guessing wan i switch them to small it will fix that...


Thanks guys

Your mains are actually very THX style.

They are about -3db at 80hz and about -6db at 60hz. This is a 12db/octave rolloff towards 40hz.

Now a THX crossover, with mains set as small, works like this

There is a digital 12db/octave high pass filter rolling off your mains, and a 24db/octave low pass filter rolling off your sub. The sub will be 6db down and the mains will be 3db down.

In other words, factoring in that your mains are already 3db down, there should be proper acoustical summing with your mains 6db down at 80hz and your sub 6db down at 80hz for flat frequency response.

Now other factors do exist...

1) Does your receiver use THX slopes in its crossover?
2) Is your sub otherwise flat up past 100hz?
3) Is the room creating problems?

 

[TLS Guy]

Your mains are actually very THX style.

They are about -3db at 80hz and about -6db at 60hz. This is a 12db/octave rolloff towards 40hz.

Now a THX crossover, with mains set as small, works like this

There is a digital 12db/octave high pass filter rolling off your mains, and a 24db/octave low pass filter rolling off your sub. The sub will be 6db down and the mains will be 3db down.

In other words, factoring in that your mains are already 3db down, there should be proper acoustical summing with your mains 6db down at 80hz and your sub 6db down at 80hz for flat frequency response.

Now other factors do exist...

1) Does your receiver use THX slopes in its crossover?
2) Is your sub otherwise flat up past 100hz?
3) Is the room creating problems?

You are on the right lines here.

His speakers are 6db down at 60 Hz. They are sealed. So they are rolling off at 12 db per octave from around 80 Hz. If he sets his receiver crossover to 80 Hz, then his speakers roll off plus the 12 db roll off of the receiver's high pass filter, will roll his mains off at 24 db per octave, and put his mains down 24 db at 40 Hz.

His sub has a response to 180 Hz, so the fourth order low pass of his receiver, will put his sub down 24 db at 160 Hz, which will make just about a perfect splice.

For HT use it is unfortunate that so many speakers are ported. Roll off is 24 db per octave, and with a receiver crossover alone it is impossible to make a perfect transition.

 

[rulebritannia19]

I just build my own

 

[Cruise Missile]

Just an FYI, my Denon 4311ci also has an adjustable LPF for the LFE.

 

[bikdav]

Don't Forget Output Levels

Watch your levels also. If after your initial set-up your subwoofer output sounds weak and its level control is already turned up quite a ways past the half way point, you may have to bring down the other channels somewhat. I found that out after having this problem.

 

[sholling]

Just an FYI, my Denon 4311ci also has an adjustable LPF for the LFE.

I stand corrected. I'd never seen it anywhere else.