B&C 18tbx100 T-tqwt

[soundhead]

Help

I am looking for a T-tqwt design for b&c 18tbx100 for outdoor use. Playing down to 35hz

 

[bjorno]

Hi soundhead,

FUY, Here is an example of a single folded T-TQWT not tuned to low for outdoor use:

b

 

[soundhead]

Hi soundhead,

FUY, Here is an example of a single folded T-TQWT not tuned to low for outdoor use:

b

Thanks Bjorno this single folded looks good.

 

[bjorno]

Thanks Bjorno this single folded looks good.

Agree, Not that large...~45.5" high (if 18mm wood).

What is your application besides being used outdoors?

b

 

[soundhead]

I will be playing R&b,hip hop and pop music.

The next hard part is to find someone to fold it up for me.

 

[bjorno]

I will be playing R&b,hip hop and pop music.

The next hard part is to find someone to fold it up for me.

Cut the HR layout in half(=112 cm internal height) and locate the terminus S4 at the bottom of the enclosure facing rotated 90 degrees (S4= a rectangular opening of 46 x 8.78 cm^2).

I calculated with a very narrow internal width of 46 cm and driver should be located at fitting snugly touching the bottom plate . The box external width would be at minimum~46 +2 x 1.8 cm= ~19.53".

b

 

[soundhead]

Cut the HR layout in half(=112 cm internal height) and locate the terminus S4 at the bottom of the enclosure facing rotated 90 degrees (S4= a rectangular opening of 46 x 8.78 cm^2).

I calculated with a very narrow internal width of 46 cm and driver should be located at fitting snugly touching the bottom plate . The box external width would be at minimum~46 +2 x 1.8 cm= ~19.53".

b

I am not that smart when it comes on to maths be I will try to figure it out.

Thanks

 

[bjorno]

...I am not that smart when it comes on to maths be I will try to figure it out...

Hi Soundhead,

A few more hints:

b

PS: If you are 'off' a quarter of an inch on any dimension: IMO/IME, This wouldn't cause noticeable differences on the performance.

 

[soundhead]

Thanks bjorno
I will post a drawing that I am working on later.

 

[soundhead]

Bjorno
Can four of this cabinet hit 135db outdoor.

 

[bjorno]

...Can four of this cabinet hit 135db outdoor...

This will depend on the system space load :

b

 

[CRESCENDO]

In other words, not likely - unless there is a wall or a corner to put them in, outside

 

[soundhead]

Bjorno
What can be done to get 135db outdoor 2.0pi
Will a longer horn work

 

[CRESCENDO]

If you're open to a TH design and a little more work, this should achieve the output and extension you're after: 18TBX100 TH by epa

 

[bjorno]

..What can be done to get 135db outdoor 2.0pi..

Add some more speakers ...6 T-TQWT's(6 Ohm system impedance(5.33 Ohm)) in total 2S x 3P... + 2400W-amp or Eg=120 VRms.

..Will a longer horn work..

Not necessarily longer but larger, not if a T-TQWT is using only one driver/box.

b

 

[soundhead]

If you're open to a TH design and a little more work, this should achieve the output and extension you're after: 18TBX100 TH by epa

Tapped horn was my first bet but too complex to build.

 

[soundhead]

Not necessarily longer but larger, not if a T-TQWT is using only one driver/box.

b

How much more larger the box will be.

 

[bjorno]

How much more larger the box will be.

As large as necessary without screwing up the passband FR or phase, of course.

At first hand:I never sub-optimize speakers by chasing SPL or Power,actually in my world all other parameters involved comes first as being more important.

SPL and Power is simple: Just add more speakers...

b

 

[soundhead]

Bjorno
Two driver per cabinet at 51" high is good enough for me.
Can you post on example of the cabinet size like you did in post#8.

Thanks

 

[soundhead]

Cabinet measurements

Bjorno

Please let me know what you think and feel free to make any corrections

Thanks