Hi all,
I am currently doing some DIY (of the home improvement type). I will be building a partition dry wall which lends itself to designing in an in-wall speaker setup. The room will have a footprint of 3m by 4m and a height of 2.4m. It will be our 'snug' (a smug middle class term for a compact cosy sitting room). The speakers would be in the 4m wall so facing the 3m distance.
The main constraint will be the depth which I estimate will be about 84mm internal. The internal width could be up to 330mm and the height has less restriction so could be anything up to 2.4m (but I'm guessing up to 1m would suffice). I was wondering if a MLTL or something similar would work and I was thinking of the MA CHN110 (good price at the moment at KJF). It would be a stereo pair for mainly TV use and occasional music listening.
I am currently doing some DIY (of the home improvement type). I will be building a partition dry wall which lends itself to designing in an in-wall speaker setup. The room will have a footprint of 3m by 4m and a height of 2.4m. It will be our 'snug' (a smug middle class term for a compact cosy sitting room). The speakers would be in the 4m wall so facing the 3m distance.
The main constraint will be the depth which I estimate will be about 84mm internal. The internal width could be up to 330mm and the height has less restriction so could be anything up to 2.4m (but I'm guessing up to 1m would suffice). I was wondering if a MLTL or something similar would work and I was thinking of the MA CHN110 (good price at the moment at KJF). It would be a stereo pair for mainly TV use and occasional music listening.
We do know that the CHN110 is a good driver.
An ML-TL certianly sounds doable.
84x330mm cross-section, 277 cm2. The only ML-TL i have handy, the Pensil, is much larger. But short.
dave
An ML-TL certianly sounds doable.
84x330mm cross-section, 277 cm2. The only ML-TL i have handy, the Pensil, is much larger. But short.
dave
the internal surface area of that space is way to small for this driver, you will have a very uneven response i think with little bass and a lot of resonances.
To have a flat response you need about 2x that 277cm² surface area (calculated from your max dimension) i think, a good guide is +4 x SD, so in this case SD is 109cm², and so the surface area need to be more than 436cm², not including bracing and so.
So to play safe i would start with an surface area of 500cm². Then a pipe of 160cm with a port of 100cm² surface area of 1.8cm long (the thickness of typical plywood) 10cm of the bottom and the driver center at 40cm from top could work for a tuning of 40Hz (just as example after a quick calculation). Stuffing the cabinet will have to be done to flatten out the resonances up high.
The MLTL i did with this driver had a surface area of 600cm² and a length of 120cm internal, and a port of 80cm² (slot of 20x4cm) of 8.8cm long.
To have a flat response you need about 2x that 277cm² surface area (calculated from your max dimension) i think, a good guide is +4 x SD, so in this case SD is 109cm², and so the surface area need to be more than 436cm², not including bracing and so.
So to play safe i would start with an surface area of 500cm². Then a pipe of 160cm with a port of 100cm² surface area of 1.8cm long (the thickness of typical plywood) 10cm of the bottom and the driver center at 40cm from top could work for a tuning of 40Hz (just as example after a quick calculation). Stuffing the cabinet will have to be done to flatten out the resonances up high.
The MLTL i did with this driver had a surface area of 600cm² and a length of 120cm internal, and a port of 80cm² (slot of 20x4cm) of 8.8cm long.
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Do note that if the volume is insufficient for an ML-TL, you need something like 20-30 litres for a good reflex. Given wall mounting and the size of the room even sealed could work well.
Would need low Q, so ideally 50 litres or so, 50 litres given 277 cm2 then 1.8 m tall. Maybe a bit less volume given that one wants to suppress any half-wave action. Anechoic F10 in the low-mid 30s anechoic, given room gain, one has to ask if any additional help is needed… how stiff are the walls? Doors and windows?
dave
Would need low Q, so ideally 50 litres or so, 50 litres given 277 cm2 then 1.8 m tall. Maybe a bit less volume given that one wants to suppress any half-wave action. Anechoic F10 in the low-mid 30s anechoic, given room gain, one has to ask if any additional help is needed… how stiff are the walls? Doors and windows?
dave
