Thread: My latest project.....

NEIL I like style of the cabinet you have done for your mate ,now all you gotta do is encourage him to buy more DVD's that you can watch and of course build more cabinets..,oh nice job by the way.

CHEERS

Originally Posted by Auld Bassoon

Hmmm, as I'm planning on some cabinets to hold CD/DVDs, a hi-fi stack, wide (ish) -screen TV and, at least the sub-woofer and central speakers, I might be borrowing some ideas here.

Cheers!

Very Nice work Neil, Love the Design. Your own?

Steve... You may want to try mounting you Sub some how in or on what you currently have before designing & building a place for it in your new cabinet. The low freq may vibrate every thing in your cabinet producing more of a din than the sound you are looking for. I have found that the floor is the best place (we have cement) & even then, there are things in the room that vibrate.

ticky

My DIY sub vibrates the accross the road neibours front windows... had them baffled for months it was only when he got a job at my work and talked to me, that they found out why their windows would rattle and vibrate some times!

Like you taste in DVD's too.

G'day Ticky,

Thanks for that - I had thought about it, and have come up with this solution:

The sub will be in its own cabinet enclosure section under the TV (and here's the trick bit, the cabinet's floor will be cut out enough so that the sub can sit on its own four feet on the carpet under the cabinet: it won't actually be touching the cabinet at all). The sub has four feet which raise it about 45mm above the surface it sits on, and has a couple of downwards facing "sound holes" (sorry for the technical term ) as well as the 300mm (or so) forward facing speaker cone.

The left and right speaker enclosures will sit on a solid timber cabinet section floor, that is, in turn, mounted on some sponge rubber, and so free to move a little without sending vibrations into the cabinet itself.

The centre speaker enclosure will be above the TV, again in its own cabinet section, with a similar floor treatment.

The other two speakers are of course placed in the corners of the room opposite the cabinet.

I'm also building in a power supply and several low rpm / large(ish) diameter roller-bearing fans to help extract heat from the TV section and ditto from the HiFi rack adjacent.

Quick Q, though: would it be better to have the sub sit on a hard surface (e.g. a block of solid timber) that, in turn, sits on the carpet? I think that the fibrous texture of the carpet may muffle / distort the sound, is this correct?

I may even post some pics

Cheers!

Originally Posted by Auld Bassoon

G'day Ticky,
Quick Q, though: would it be better to have the sub sit on a hard surface (e.g. a block of solid timber) that, in turn, sits on the carpet? I think that the fibrous texture of the carpet may muffle / distort the sound, is this correct?Cheers!

G'day Steve, sorry it took so long to get back to you. Yes, I think it would be better to sit your sub on something more solid than carpet, particularly as it has downward facing sound holes (& I think that is a Tech Term) but I would suggest a small cement slab or large cement paver rather than a block of timber, but please be aware, I am no expert.

Those sound holes(!) are called ports as in a bass reflex enclosure... the wood sitting under the sub will be fine... it may be benificial to actualy have the speaker facing down too, sub fequency's are usualy loaded into a room better that way than a direct facing one(most times... but not always).
The only problem I can see with a set up like this is the subwoofer magnet may affect your TV's picture being this close, you dont really need the sub to be in that spot as sub fequencys are unidirectional. It can be mounted just about any where in the room... idealy you would try it in several spots to get the best(flattest) response, you may find the sub sounds better at the back of the room.
When sitting in a room with a real sub you should not be able to locate the sub with your ears, if you can it means the crossover is set to high.

Ps, Im talking real subs not those poxy HT in a box crap... they tend to crossover to the sub(so called!) at higher fequencys than real ones because the poxy little satellites cant produce even mid bass so the sub must make up for it... then you can tell where the sound is coming from!
(the reason I dont like those Bose lifesytle systems)