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A couple of questions for the experts, AV cabinet build

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Orcish75:
Hi everyone,

So, we have decided to move the home theatre and create an entertainment area upstairs. The wall space is quite a bit smaller upstairs and so a custom AV cabinet will have to be made. In order to accommodate reasonable sized speakers and subs, the speakers will have to be built in as part of the cabinet. Two big advantages of doing this are firstly, good WAF and secondly, I can build large volume (approx. 200L) boxes for the subs.

If youíll refer to my CAD masterpiece below: (I do take Bitcoin as royalties, should anyone wish to publish my diagram in an audiophile journal or engineering schematic)



From what Iíve read, you should have the mids and tweeters at ear level. I order to accommodate this, the main speakers will have to be inverted so that the mids and tweeters are at the bottom and the bass drivers at the top.

1.   Are there any problems or disadvantages to doing this?

The sub boxes will be wider than they will be deep. This gives the opportunity to use nice long tubes for the ports, to tune them really low.

2.   Any disadvantages to side firing ports as opposed to front?

My WAF woofer build has down firing ports and it sounds great, never tried side ports before.

Iím guessing that all the speakers will need to be decoupled from the main AV cabinet to minimise the AV cabinet from vibrating and introducing noise.

3.   What would be the best way to achieve this?

I was thinking that each main speaker and sub is built with itís own separate cabinet and then each individual cabinet fit snugly in place (without touching any part of the AV cabinet) and have speaker spikes as the only contact with the AV cabinet (and floor for the subs).

Look forward to your responses.

Timber_MG:
I would either go for massive 32mm construction or decouple the speakers. Spikes are coupling devices, the studio monitors of old were either stood on cast concrete or slid into their housings with foam all the way round to decouple them.

For the speakers, the fastest way is to take an existing set and integrate it into your project. Second hand units  or a kit within your budget. There are always options like co-ax speakers that simplify the amount of speaker holes and the like. For 200l enclosures, I would look at 15-18" drivers to suit, though I'd look at slot loading them to ward off little fingers and feet. Most of all I'd model the room and determine whether they'd be in an acoustically favourable position to begin with.

Because of the near uprights being reflective surfaces nearby, I would suggest waveguide loaded tweeters to reduce the early reflection.

bbe22:
 - first decide,  as Timber suggest whether you build in the actual speakers,  L & R & Center or slide finished speakers  into the prepared   sections.     If build in at least do / plan for removable baffles.
 - OK  to turn the L & R upside down
 - ergonomically the following may  be better:



(note the center layout..........)

El Sid:
C'mon bro - you can pack two more sub drivers in there....  ;)

Maybe you want to leave more space for amps in case you go 7.2.whatever?

Baine Bloodhoof:
Im a bit concerned about these items falling off  :goofy: Or is this purely a colored thing :giggle: Yes yes yes, I agree, my design is exactly what you have in mind. The amp comes highly recommended as well




You front and subs, will they be all on the same plain? If they are, will this not cause a deflection from the front speakers?

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