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 Post subject: 375L project
PostPosted: 17 Feb 2021, 13:05 
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Joined: 03 Jun 2020, 11:06
Posts: 118
Location: France
A new enclosure project - quite big this time... :D

Two possible looks : "Grand" and "Compact".

Which one do you prefer ?

The "Grand" 375L :

H=750 W=420 D=360mm / Vnet = 77L / F3 = 38Hz / Q = 5.6
Image

The "Compact" 375L :

H=750 W=420 D=360mm / Vnet = 60L / F3 = 42Hz / Q = 4.5
Image

Size comparison between the "Grand" and the "Compact" :

Image

V vs. H modes for the "Compact" 375L :

Image

Note : for both models - there's one Left and one Right enclosure - I mean they are mirrored.

Thanks to let me know... By curiosity ! ;)

-tbln.

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 Post subject: Re: 375L project
PostPosted: 19 Feb 2021, 20:15 
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Joined: 09 Oct 2012, 19:43
Posts: 383
Location: Vancouver Canada
Larger cab,,,, larger/lower/fuller bass. For the little bit extra wood and getting the tweeter away from the bass port. Both a plus for me as me like bass. But then I don't have a wifey wanting smaller smaller smaller and her living-room back. So I suppose one must take into account the "danger value" in such a case as well as the spkr parameters.

But then, since both cabinets, despite the pics, have the SAME dimensions errrrr hmmmm makes your Question rather mute.


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 Post subject: Re: 375L project
PostPosted: 20 Feb 2021, 05:15 
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Joined: 03 Jun 2020, 11:06
Posts: 118
Location: France
Yes @Laurie54 : my bad... Too quick copy and paste :blush:

The "Grand" is 750x420x360mm.
The "Compact" is 610x420x360mm, that is to say 140mm less tall.

Volume for the midrange is 7.5L in the "Grand", and 4.0L in the "Compact".

Image

My wife prefers the "Grand", finding it better looking and more classic appearance than the "Compact".

A friend of mine which works in Sound Renforcement prefers the "Compact" because of its easier H or V placement and speaker closeness homogeneity.

At home, the living room is for TV, my small auditorium is for Music only... No interference. 8-)

-tbln.

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 Post subject: Re: 375L project
PostPosted: 20 Feb 2021, 12:59 
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Joined: 03 Jun 2020, 11:06
Posts: 118
Location: France
Oh, I forgot to mention the speakers :blush: ;) :

+++ In Bass-Reflex operation :

Woofer = Beyma 12B100R.
Image

Midrange = Beyma 8M60N.
Image

Tweeter = Beyma CP21/F.
Image

+++ In optional Sealed enclosure operation :

Same speakers and cabinet, except for
Woofer = Beyma 12BR70.
Image

-tbln.

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 Post subject: Re: 375L project
PostPosted: 20 Feb 2021, 23:01 
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Joined: 09 Oct 2012, 19:43
Posts: 383
Location: Vancouver Canada
150W and 4" voice coil your going to need some bracing. I put up a
pic of some SMC pads you may want to look at. But I agree with your
wife. Good on you girl.


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 Post subject: Re: 375L project
PostPosted: 21 Feb 2021, 06:12 
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Location: France
laurie54 wrote:
150W and 4" voice coil your going to need some bracing. I put up a
pic of some SMC pads you may want to look at. But I agree with your
wife. Good on you girl.


Yes ! :D

I plan to use 18mm Poplar plywood (7.8kg/m2) or 18mm glued-laminated Beech wood (13.4kg/m2).

The 1st is lightweght, resisitant, stable, easy to work and cover with Tolex, like these ones covered in 2-tone :

Image

The second is very stiff, superb in natural sanded/oiled finish, hence "The Cube" enclosure below :

Image

But Beech Wood will make the cabinet nearly 2X more heavy - even if there probably will no need for bracing - than the Poplar plywood... :eek:

Cheers,

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 Post subject: Re: 375L project
PostPosted: 21 Feb 2021, 20:58 
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Joined: 09 Oct 2012, 19:43
Posts: 383
Location: Vancouver Canada
I do like the cubes. Always prefer the natural wood to an of the coverings or paints.
They are a piece of furniture after all.


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 Post subject: Re: 375L project
PostPosted: 22 Feb 2021, 15:17 
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Location: France
laurie54 wrote:
I do like the cubes. Always prefer the natural wood to an of the coverings or paints.
They are a piece of furniture after all.


Yes, that's right... Morover, finishing the cabs in Beech wood is easier and nicer, so that's why I am tempted to go that route despite the weight !

I'll calculate the real difference - given that the Tolex covering is quite heavy itself too.

Cheers,

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 Post subject: Re: 375L project
PostPosted: 23 Feb 2021, 04:10 
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Joined: 09 Oct 2012, 19:43
Posts: 383
Location: Vancouver Canada
I look at it this way. You can spend countless hours working on them and enjoy the sound
and the warmth of the natural wood. Or you can put diapers on another pair and sleep sound
knowing if there is a flood your speakers will stay clean and dry. (and probably float)


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 Post subject: Re: 375L project
PostPosted: 23 Feb 2021, 07:08 
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Joined: 03 Jun 2020, 11:06
Posts: 118
Location: France
A weight calculation gives me this, for the empty cab :

- 18mm laminated-glued Beech wood, natural oiled finish = 18.9kg

- 18mm Poplar plywood, covered with glued Tolex = 11.9kg

That's +7kg / +58% weight for the Beech wood. This is the price to pay for an easier, nicer natural finish... ;)

Cheers,

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