DIY Centre Speaker advice

[sunrise3500]

that im not sure about
it'd still be cheaper than coax though in total

id still do the coax down the track, just wondering if i'm going to end up with a pretty good result as it is with this idea.

 

[MJL21193]

just wondering if i'm going to end up with a pretty good result as it is with this idea.

It sounds like you're worried. This is fun! Cheer-up.
Ok. Here's what you should do:
http://www.creativesound.ca/pdf/WR125S.PDF
Buy this fullrange, mount it in a box the size they show. Done. For a centre speaker, you won't be disappointed.

 

[bjorno]

…falling back into just a MTM..

Don’t fall back. My opinion is that most MTM’s for center use are disastrous, compared to the use of this option in a HT set-up, it’s often better to invoke the HT-amp virtual center function than using a MTM but your proposal of a W-M-T-W is by far better.

b

1(3)

 

[bjorno]

2(3)

 

[bjorno]

3(3)

 

[sunrise3500]

well sounds like the W TM W idea is worthwhile then
im assuming those midrange woofers im looking at go low enough, it is only a centre channel anyways, and subwoofer comes in then anyways, so im guessing it'll be fine

thanks heaps!

 

[CONVERGENCE]

For a center speaker please check the foolowing project.
2 755 8" Altec with 3000 HF tweeter driver.


http://www.wmeckle.com/PERCY/Center/Center Altec.html


PROJECT BY William Eckle
This project was submited to AudioXpress and published in the April 2007 issue


.............................................................................................

 

[MJL21193]

bjorno: I'm drawing a complete blank...not even if I was completely drunk, could I pretent that I knew what those charts mean. SOME explaination might be required.

 

[larksp]

lol me two interesting info

i was more looking at this because i wanted to design a box for a center speaker

drivers and crossover is the b&w cc6s2

do have one of these already but i want to make a box for fun dunno how with the programs i have used

need something simple like you set what port fs then it tells you size of each bit wood and port lenth so on and bracing.
nice and easy is there anything

sorry to change your subject i am new

 

[bjorno]

….For a center speaker please check the foolowing project…..

My opinion is that a center should have authority and not appear acoustically tiny (and to an extent not too physically small) compared to L and R and power wise at least as capable, if not the double and capable down to 50 Hz. See picture 1(2).

The center speaker is the main and for a HT, the mayor important anchor speaker if used and should dominate the audio scene relatively with + 3 dB level and preferably cover up to 60 degrees azimuth without severe dips and always best when run in… large… mode, despite there might be a Sub involved, projecting and referencing the dead center at the visual screen even if moving around to different listening/viewing positions.

SOME explaination might be required….

Pictures should explain more than thousands of words..or? See example picture where xdir are compared with ArraySHOW. 2(2).

b

1(2)

 

[bjorno]

2(2)

 

[CONVERGENCE]

For Home theatre the need for a similar center speaker as the left and right is not a necessity . In home theatre application the dialogue track is not panned vis a vis the actor like in a real theatre cinema. The dialogue track is concentrated in the midle.

But if you want a full range two way speaker it's ok. But don't expect the dialogue to move from left to right like in a real theatre. I hope my explanation is clear.


🙂

 

[Tenson]

I feel sympathy the person who started this thread. They wanted a good centre speaker and from a quick glance over the replies they have had technicalities and hundreds of graphs thrown at them.

Take MJL's advice and build that 'USB' coax speaker.

http://www.humblehomemadehifi.com/USB.html

It is ideal.

If you want something a bit smaller Seas also do some smaller coax drivers.

I have some main speakers using the slightly updated version of that driver in the USB speaker and they are very, VERY good drivers.

You could put one of those coax drivers in a largish standmount ported enclosure, use one capacitor on the tweeter and be away. You may not even need baffle-step correction if it is directly under or on top of a big TV.

 

[Marzen]

Take MJL's advice and build that 'USB' coax speaker.

I would agree. If this is your first project this would be ideal, and a good reference point for your next project.
I think this link is for the newer version of the Seas H1144-08/06 driver.
Seas H1144-08/06
And I would agree that horizontal MTM's are a bit too much of a compromise for ctr channel usage as lateral dispersion and power uniformity is often quite poor.

 

[sunrise3500]

Well it sounds like the opinion is it's only worth me doing the single coaxial.. Now, I'm in Australia, doesn't seem to be quite so easy to get that Seas driver? What sites online are recommended that sell it (and ship internationally), and I'll take a look at what other coax drivers are available in Australia. (If anyone has any recommendations, that would be appreciated)

edit: looks like there's lots of 4ohm coax speakers :/ guess that's for cars

 

[Tenson]

You don't want any old car coax, you want the Seas. Buy it from Solen, a Canadian based company that ships international and usually very quickly too (2 days to my door here in the UK).

 

[sunrise3500]

there's a speaker shop in my city that sell the Seas H1333, but not the H1144. Dont know if they have it in stock, but it's on their list.

 

[sunrise3500]

there's a speaker shop in my city that sell the Seas H1333, but not the H1144. Dont know if they have it in stock, but it's on their list.

I've called them up
they do have the H1333 in stock.
But also the P17RE CX/TVF (H653) and
P17REX CX/F (H489) which are both on special and much cheaper.

What are the opinions of these as alternatives?

 

[Marzen]

Well it sounds like the opinion is it's only worth me doing the single coaxial.. Now, I'm in Australia, doesn't seem to be quite so easy to get that Seas driver?

Sorry, I completely overlooked your location. May be a moot point however as I was under the impression you were trying to keep a reasonably low budget for this speaker. The 3 way WMTW horizontal speakers I would normally recommend are much more expensive and that doesn't even take into account shipping to Australia. If you could find an existing budget 3 way tower with local drivers you could easily adapt that to a horizontal design provided it had a small tweeter that could sit above the mid and keep the 2 outside woofers center to center distance within 1 wavelength at the xo point. I wouldn't get to caught up with BSC and diffraction from the TV at this point.
Still, the coax is tempting as it could be paired with another one down the road and moved to surround duty.

 

[sunrise3500]

If you could find an existing budget 3 way tower with local drivers you could easily adapt that to a horizontal design provided it had a small tweeter that could sit above the mid and keep the 2 outside woofers center to center distance within 1 wavelength at the xo point.

well I did mention two vifa midrange woofers and asked about suitability for them as woofers in a W MT W design, which I could get very cheap.if you have an opinion on them and their suitability that would be great! it would probably cost me 30%-80% more to do the seas coax driver based speaker - depending on which i get

now I'm awaiting some feedback on the ones mentioned above