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21" version of TRS-218

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snowflake View Drop Down
Old Croc
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    Posted: 09 May 2023 at 10:00am
I've modelled and drawn a double 21" that has a similar layout to the TRS-218. Does anyone have an approximate hornresp model for a TRS-218 or an F221 so I can check whether it is anywhere close to the performance of those?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 10:24am
There is the Ohm measured data here: https://www.oldbarnaudio.co.uk/wp-content/uploads/2019/02/TRS-218_Datasheet_V2.0_09-02-2018.pdf


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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 11:22am
Originally posted by snowflake snowflake wrote:

I've modelled and drawn a double 21" that has a similar layout to the TRS-218. Does anyone have an approximate hornresp model for a TRS-218 or an F221 so I can check whether it is anywhere close to the performance of those?

I would sim it like a simmed a cubo, TH, with throat chamber (which is large). S1=S2 L12 0,1cm. Tap part is very short, but could be seen as there. Otherwise i would see it just as a normal BR (which it mostly is for the working part if i see the layout correctly).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 12:44pm
yep have modelled mine as a tapped horn with large throat volume. there is a plan for TRS218 on youtube but not sure if it's accurate. Ohm make the drivers and no idea of ts parameters.

https://www.youtube.com/watch?v=7c_gNBvdNTw

Edited by snowflake - 09 May 2023 at 1:13pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 2:31pm
That youtube channel is mostly bs. So would not trust it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 3:29pm
Originally posted by smitske96 smitske96 wrote:

That youtube channel is mostly bs. So would not trust it.


yeah their TRS218 plan shows two paths that are 140mm wide connected to the central path which is only 200mm wide. There are people who say constricting a horn at a bend works but it's very unusual. agree probably BS
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 4:03pm

that what I've got with 2W nominal input for direct comparison to TRS218 response. My box is 100L bigger than the TRS218 but sensitivity is 1-2dB better and a bit flatter. not sure what driver OHM use but expect peak output will be a lot greater with high excursion 21" drivers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 7:54pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FOO Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 10:25pm
Have a look at TW Audio BSX. I guess it's probably what you are aiming for. 


And yes, they do what it says on the box Big smile


Edited by FOO - 09 May 2023 at 10:26pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 10:33pm
Originally posted by FOO FOO wrote:

Have a look at TW Audio BSX. I guess it's probably what you are aiming for. 


And yes, they do what it says on the box Big smile


Bit of a shame they choose to quote program power figures, and very vague frequency limits!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2023 at 11:15pm
Originally posted by FOO FOO wrote:

Have a look at TW Audio BSX. I guess it's probably what you are aiming for. 


And yes, they do what it says on the box Big smile


that's 50% larger than the TRS-218. Look good but can't find any response plot for them...

guess they are using something like an 18Sound 21id driver.




Edited by snowflake - 09 May 2023 at 11:34pm
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Post Options Post Options   Thanks (1) Thanks(1)   Quote FOO Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 2023 at 5:05am
If I get the time this upcoming weekend, I can measure them. It will be outside on a grassy field. 6 each side in end firing setup, 3 layers of 2. 
But one box could be plugged in on its own for measurements. 

But they don't disappoint. 27hz is real. Not f3 real, but they do get down there. 
And can't see why it's a problem with the program power?
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