DIY - Casavant Transmission Line Powered Subwoofer with ScanSpeak 26W and OAudio AMP 500 BASH

[@kentkent2788]

Transmission line loudspeakers employ this tube-like resonant cavity, with the length set between 1/6 and 1/2 the wavelength of the fundamental resonant frequency of the loudspeaker driver being used. The cross-sectional area of the tube is typically comparable to the cross-sectional area of the driver's radiating surface area. This cross section is typically tapered down to approximately 1/4 of the starting area at the terminus or open end of the line. While not all lines use a taper, the standard classical transmission line employs a taper from 1/3 to 1/4 area (ratio of terminus area to starting area directly behind driver). This taper serves to dampen the buildup of standing waves within the line, which can create sharp nulls in response at the terminus output at even multiples of the driver's Fs.

[@EgonFilho23]

This is a quarter wave

[@ColinCochranT11]

good to see a proper wood worker build a speaker

[@kiliabehera6067]

Colin Cochran.

[@travis4798]

The only issue I see is going to be the output, you basically chocked the chamber with polyfill. A little piece of eggfoam or polyfill at the end of the chamber where the chamber ends near the driver is all that's needed. Other then that looks like a great build!

[@EgonFilho23]

For me it's perfect

[@Dreez76]

Gorgeous. I'd love to experience how they sound. I've always been interested in transmissionline speakers.

[@mwinner101]

That is awesome. Just need to have the talented builder do a review of how good it sounds.

[@martianshoes]

Wondering about trying this, with this pair of Hartley 10" LF drivers I have...I was thinking that as fast as they are they would lend themselves to a good quarter-wavelength design....

[@albertchaboya9944]

I was wondering where you obtained the plans for this project. I've been wanting to do a T-line design myself.

[@AmazingRoony]

Respect man. I think it will sounds suburb !

[@paulking2039]

nice work and thanks for vid, hopefully it might of solved a problem for me, and how to cover the wood before paint and so no cracks hopefully afterwards cheers

[@partiktuk]

Looks amazing.. What's the music playing?

[@EgonFilho23]

Tocata e Fuga em ré menor.

[@EgonFilho23]

Toccata e fugue D minor, BMV 565

[@Mattyboy88979]

All that trouble and you never routed out the plate amp flush? but very awesome.

[@jocabacellar]

Boa noite Egon, possuo um Home Samsung e gostaria de fazer um upgrade no sub. Construindo uma caixa LT irá melhorar os graves? Quando calcula a caixa para uma frequência ex. 47 Hz ele responde a outras frequências? Obrigado.

[@EgonFilho23]

+João Carlos Nunes Bacellar Pra mim os graves e subgraves de LT são os melhores. Existem opiniões diferentes sobre uso de LT. Pra mim a resposta melhor é até duas oitavas acima da FS do falante. EX: FS 30, uma oitava acima 60, duas oitavas acima 120hz. A melhor utilização se daria na faixa de 30 a 120Hz neste exemplo. Tem gente que usa acima disto. Eu não gosto.

[@fiapoko1]

Just wondering... but first, if were dealing with sound pressure and pressure flows in the path of least resistance... I think your port is on the wrong side. Air would exit as soon as it reaches the port. I'm just wondering about the other air chamber

[@EgonFilho23]

+fiapoko1 Whatever the side of the port

[@martianshoes]

+fiapoko1 If I understood correctly it is not air pressure you are accommodating, but rear wave flow.

[@jocabacellar]

O sub opera de 40 ~ 160 Hz o cálculo para a caixa LT seria qual? Desculpe pela quantidade de perguntas. Obrigado.

[@EgonFilho23]

+João Carlos Nunes Bacellar Precisa saber qual a FS do falante para se calcular o tamanho de uma LT.

[@ipishta666]

Can You publish cut sheet or give link with it?

[@00sven00sven00]

curious as to why some poeple choose to clamp other than chuck a few screws in when they glue their pieces together, any particular reason why?

[@EgonFilho23]

Sven Lindroos Who doesn't know how to use glue, use screws and glue.

[@00sven00sven00]

Oh, did you use screws as well in this build? I've seen other vids where guys only use glue and clamps. I'm guessing it's an aesthetic reason? No screws to hide.

[@00sven00sven00]

Oh, did you use screws as well in this build? I've seen other vids where guys only use glue and clamps. I'm guessing it's an aesthetic reason? No screws to hide.

[@EgonFilho23]

Sven Lindroos Without screws. Just glue.

[@kittyboy5791]

+Sven Lindroos clamping joins with even pressure

[@yellowfrog4293]

Is this a active speaker or a passive one?

[@EgonFilho23]

+gele kikker Active. Oaudio Amp BASH 500

[@TaylorMadejdm1975]

What are the specs?..

[@EgonFilho23]

18hz a 120hz, 500wrms

[@svartahridxhgc]

En este tipo de sistema, se toma en cuenta de forma separada el espacio del puerto y el de la bocina? o pasan a ser valores mezclados?

[@EgonFilho23]

La longitud de la línea es dada por el FS del altavoz. El área de la línea es dada por el diámetro del altavoz. Falate en un extremo. Puerto en el otro.

[@Servis-f3h]

MANTAP , I LIKE

[@UnicycleWheelie]

where did you get that amp?

[@EgonFilho23]

Here: www.oaudio.com/500W_SUBAMP.html

[@andrizzle_9564]

would you recommend a tline for 2 250rms 12's

[@EgonFilho23]

+Salvador Lopez What is the proposal?

[@andrizzle_9564]

+Egon Filho 2 soundstream EXW12's

[@EgonFilho23]

+Salvador Lopez Home system, or parties? Car? If it is for home system, you don't need more than one.

[@alfguimaraes68]

1 pergunta, qual o tamanho deste falante e potência? e pelo que li em uma das suas respostas, frequências vão de 30 a 120 ? quero fazer um sub forte para meu home, vc consegue ou vende esse projeto? e o que seria LT? grato

[@EgonFilho23]

É um ScanSpeak de 10 polegadas e FS de 21hz. Potência 100h RMS 150W, long term Máx power 350 Wrms. O crossover do Oaudio Amp Bash é que permite cortes entre 40hz a 120hertz. LT abreviatura de Linha de transmissão que é o modo de construção, outros seriam selada, bassreflex, open baffle, etc... Não vendo, é um projeto próprio, para meu uso.

[@alfguimaraes68]

Egon Filho hum......OK, obrigado pela atenção.

[@IMAMPOJMA]

4:09 - 4:22

[@utubecomment21]

I wonder how your Bash amp is holding up. Whilst the 500 only gets 1 - 1 Star rating, the Bash 300 gets a bit of a bashing (pardon the pun) www.parts-express.com/bash-300s-digital-subwoofer-plate-amplifier-300w-rms--300-750

[@EgonFilho23]

+utubecomment21 Working as expected. The entry could be less sensitive. It would help in the volume control.

[@utubecomment21]

Egon Filho Cool. thanks for the feedback

[@EgonFilho23]

+utubecomment21 Bash 500 has more features and worth the investment.

[@utubecomment21]

Egon Filho OK. good to know. thanks again.

[@emiliasanabria2863]

se puede acer con los de 12"y15

[@EgonFilho23]

Por supuesto, con los cálculos adecuados.

[@chungbien1336]

you can site

[@EgonFilho23]

No.