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Multi-Way Conventional loudspeakers with crossovers

TL cabinet rear port
TL cabinet rear port
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Old 24th March 2018, 09:50 AM   #1
Williams Audio is offline Williams Audio  Jamaica
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Default TL cabinet rear port

Hi all,
I am planning a TL cabinet for a 8'' woofer, 3 way spk
Can place the open port at the rear panel, if the spk is about 1.5 meter away of the wall
Any idea and advice is very well come
Best regards,
williams
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Old 24th March 2018, 01:52 PM   #2
pkitt is offline pkitt  United States
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I have built many TLs, both with tapered lines or mass-loaded lines and virtually all of them had the terminus or mass-loading port located on the rear panel. Due to room limitations, all of my cabinets sit on a floor-level fireplace hearth with their backs 4 to 8 inches from the wall, depending on cabinet depths, with no performance issues caused by the close proximity to that wall. With a spacing of 1.5 meters, you will absolutely NOT have a problem.
Paul

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Originally Posted by Williams Audio View Post
Hi all,
I am planning a TL cabinet for a 8'' woofer, 3 way spk
Can place the open port at the rear panel, if the spk is about 1.5 meter away of the wall
Any idea and advice is very well come
Best regards,
williams
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Old 24th March 2018, 09:04 PM   #3
Williams Audio is offline Williams Audio  Jamaica
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Thanks Paul, this is very helpful to learn from your experience
This will help my design
Williams
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Old 24th March 2018, 10:00 PM   #4
planet10 is offline planet10  Canada
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TL cabinet rear port
Do post your design here so that it can be critiqued.

dave
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Old 25th March 2018, 09:10 AM   #5
Williams Audio is offline Williams Audio  Jamaica
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Hi Dave
Can contact your private?
I can not send a drawing through it
Williams
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Old 25th March 2018, 04:11 PM   #6
planet10 is offline planet10  Canada
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TL cabinet rear port
Sure. My emails in the sites linked below.

dave
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Old 27th March 2018, 02:36 PM   #7
Williams Audio is offline Williams Audio  Jamaica
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TL cabinet rear port-tl-rear-port-drawing-png

Dave,
It will be a 3 way active system, active analog xover
I am starting as a prototype and need some help and advices
In the past I built the Radford s90, the bass was good the rest ..... so and so.
I am forced the use a rear port for the TL
Thanks for your time.

Best regards,
Williams
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File Type: png TL-REAR-PORT-DRAWING.png (33.4 KB, 229 views)
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Old 27th March 2018, 05:11 PM   #8
planet10 is offline planet10  Canada
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TL cabinet rear port
I cleaned up your document to make it easier to read (and way smaller).

Rear vent is no issue.

What you have drawn is sort of an ML-TL with a pre-chamber and a bit of a driver offset. I’d have to do the math to figure out whether the decrease in line depth x the increase in line width yields an untapered line or something else.

Did you model this? Or is it seart-of-the pants? If it is you are something like 90% assured of getting something far from optimal.

dave
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Old 27th March 2018, 05:15 PM   #9
planet10 is offline planet10  Canada
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TL cabinet rear port
15x30 = 450
8x50=400

so a slight taper.

also in the notes you specify 100w woofer — power handling is not a spec that is worth giving any serious attention.

dave
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Old 28th March 2018, 05:07 AM   #10
Williams Audio is offline Williams Audio  Jamaica
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Hi Dave,
Thanks for the answer. Very nice of you.
The idea is from RADFORD S90 I built long ago.
This one, is very basic calculation of 1/6 wave length, the TL is about 2m long, 2x6=12 , 340/12=28.3 Hz; just like this, the size of the port 1/3 of the woofer effective surface which is 220 cm², so is 14x5.5 cm, I don’t have any other calculations.
The enclosure is tapered like a trapezoid, not to complicate it too much suppose it is rectangular, will ease the calculations.
If you know what software is available, or basic calculus, it can help me very much.
Best regards.
Williams
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