IB makeover..........

[Rodny Alvarez]

My VRs are 9' apart and 10' from my seat and the center CH is 10.5', there is nothing between the mains, the screen is at least 2' back and they are pointing to the side of my head not my ears, I like it this way because even when you seating on the other two side chairs it sounds pretty good.

I love Boston Acoustics, home and car audio!!!!
I see you guys move to Sonnie's arena to

[Sonnie]

I love Boston Acoustics, home and car audio!

There are no telling how many coaxials and separates I've tried in my various vehicles. I always come back to the Boston Pro separates... yet to be topped.


Back to the SLLT... The comparison is between just one IB and one SLLT.... would not the output be even more noticeable since there are TWO SLLT's and there is double the increase in ouput???

[brucek]

He will build it and he can tell us how big of a difference he notices, if any.

Hopefully, there will be an REW response taken before and after, with some sort of standard set of levels and positioning to remove as many real world variables as possible.

brucek

[Sonnie]

brucek wrote:

Hopefully, there will be an REW response taken before and after, with some sort of standard set of levels and positioning to remove as many real world variables as possible.

brucek

I did advise him of this... I suggested a raw unfiltered response from the listening position and a couple of nearfield responses... say 3" and 12" (or whatever you pros deem appropriate)... for each sub type. This is a must IMO!

[SteveCallas]

Sonnie wrote:

The comparison is between just one IB and one SLLT.... would not the output be even more noticeable since there are TWO SLLT's and there is double the increase in ouput???

Yes, this is why the headroom advantage gets up to 10db at some points. Typically, when comparing a single ported sub to a single sealed using the same driver, the ported will have up to a 6db advantage. So the additional low end headroom and power Rodny will gain isn't something to take lightly, it's roughly the equivalent of adding 10-12 more RLp-15s in that range around the tuning frequency.

brucek wrote:

Hopefully, there will be an REW response taken before and after, with some sort of standard set of levels and positioning to remove as many real world variables as possible.

I believe he has a set taken from his seat. From what he showed me, the natural IB response from his seat starts to drop off below 18-19hz.

[Geoff St. Germain]

I'm very interested to see the results of this and hear Rodny's impressions. It looks quite interesting.

[Ilkka]

Sonnie wrote:

There are no telling how many coaxials and separates I've tried in my various vehicles. I always come back to the Boston Pro separates... yet to be topped.


Back to the SLLT... The comparison is between just one IB and one SLLT.... would not the output be even more noticeable since there are TWO SLLT's and there is double the increase in ouput???

So let me get this straight. Rodny has two separate IB subs, each with two 15" drivers? And now he is turning them into SLLTs by boxing and porting them? So no additional drivers?

[Rodny Alvarez]

I'm going to build one side first and compare the measurements with the ones I have now.
There is nothing wrong with my IBs! when I heard Sonnies LLT, to me it sounded better, I know that Sonnies room is better build then mine(solid) he has dual 5/8 sheet rock and mine is only 1/2", some people think this is not an issue, but in my opinion it is, if the room is well insulated it will make a big difference(sound and spl) maybe I'm wrong anyway...the only way to figure this out is to build one of the SLLT
When playing some movies with bass it gets real loud in the attic, you can hear it everywhere, is because the IB plays as loud in the attic then it is in the room, so I'm trying to eliminate some of that sound traveling through the attic

I'm not trying to start a war between people that follow IBs and the ones the follow the LLTs some will be and some will be so by doing this, we will answer a lot of questions.
Here are some measurements ..........

I think this is right!!

Both IBs listening position


Left side IB listening position


Right IB listening position


Left IB Near field 12" from the sub


Right IB Near field 12" from the sub

[Rodny Alvarez]

Ilkka wrote:

So let me get this straight. Rodny has two separate IB subs, each with two 15" drivers? And now he is turning them into SLLT's by boxing and porting them? So no additional drivers?

Yep!! One on each side of the room (Line Arrays) and no additional drivers.

[SteveCallas]

So which side are you doing first? The response from the left one looks like it would be a little easier to work with.