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Old 19th March 2012, 08:23 AM   #1
Jameslc is offline Jameslc  Australia
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Default Fullrange home theatre

Hi all i am wondering if it's a good idea to make a home theatre out of full range drivers and a sub (if needed) if so what would be a typical good size and type of driver.

cheers James
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Old 19th March 2012, 01:35 PM   #2
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you can go for an FR solution, and if you like action movies then you'll probably want a sub (with most FR drivers, unless you plan to build 5 big horns).
The challenge can be, if you have multiple people watching the screen: directivity. Most FR drivers have quickly dropping treble output off-axis. Ciare has an interesting 8" FR drivers that suffers less from it but it's expensive.
An interesting driver could be the Fostex FF225 WK, with a high crossing tweeter added. I haven't heard it but it gives good bass according simulations in reasonably sized bass reflex boxes, and it should be smooth sounding, according to reports. With this driver you may not immediately need a sub. Imagine 3 of them as your 3 front speakers, and add 2 of its smaller siblings at the back. That could work.
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Old 19th March 2012, 02:14 PM   #3
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True home theater relies on reflections, cues, timing, etc. Off axis capabilities are important. ALso, dont forget that the information reproduced on all the other speakers (other than center channel and possibly fronts) is for moslty the "effects". So...I think it also depends on how eclectic you are and want to be.
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Old 19th March 2012, 03:20 PM   #4
chrisb is offline chrisb  Canada
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short answer:- yes

medium length answer: yes, you can make a very nice sounding HT system with full range drivers and multiple subs - the bass management in current processors goes a long way to unburdening even smaller FR drivers from the heavy lifting below, say 120-150HZ

longer answer: see above, but add that the size of THE ROOM, and audience will determine how large any of the 5 or more wide-band speakers need to be to suit the application, and that the center channel is the most important - don't compromise there

after a couple of unsatisfying attempts starting 10yrs or so ago, I finally settled on a very satisfying system using relatively small FR drivers ( Mark Audio Alpair7 and 6), and dual corner mounted woofers - the room is approx 320sq ft, and I've never measured SPLs above 90dB - so as always YMMV.
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Old 19th March 2012, 03:43 PM   #5
Octavia is offline Octavia  United States
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I like the idea of using all full range drivers plus multiple subs. Given the good comments on the Alpair 7.3 wouldn't this be a good candidate for front, center, and surrounds, and keeping all the speakers identical for the same sonic signature? I'm pretty sure Bob Brines mentioned somewhere that he was using his this way and letting them go to pretty high levels without worry because all the bass was routed to the subwoofers. I know I would want any home theater to be capable of big volume. Another issue would be how close to the wall could the speakers be placed as most home theater set ups have at least the surround speakers either on wall or near wall placement.
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Old 19th March 2012, 04:44 PM   #6
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by Octavia View Post
I like the idea of using all full range drivers plus multiple subs. Given the good comments on the Alpair 7.3 wouldn't this be a good candidate for front, center, and surrounds, and keeping all the speakers identical for the same sonic signature? I'm pretty sure Bob Brines mentioned somewhere that he was using his this way and letting them go to pretty high levels without worry because all the bass was routed to the subwoofers. I know I would want any home theater to be capable of big volume. Another issue would be how close to the wall could the speakers be placed as most home theater set ups have at least the surround speakers either on wall or near wall placement.

Yup, I'd definitely recommend keeping at least the entire front row 3 the same model, (actually with some newer variations on 7.1 etc that could easily mean 5 up front) - the rear / surrounds can possibly afford to be a size or more smaller.

As noted above, I think the questions of how large the drivers would need to be is room /application dependent. I don't consider my at 320ft^2 x 8ft ceiling to be particularly large, it s not highly damped with furniture nor as carefully "treated" as some folks like to recommend. In much larger spaces, the Alpair 7.3 could still run into problems at "realistic" / big volume levels, and there are certainly candidates from manufactures such as Fostex, TangBand, Dayton - etc. that could still allow the use of all FR drivers.
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Old 20th March 2012, 07:11 AM   #7
Jameslc is offline Jameslc  Australia
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Hi everyone thank for the responses, a very interesting read i thought i would just add that my room is 14.59m2 and the height is 2.24m so not a very big room and i am using a pioneer vsx920 it says rated power output is 125w at 6ohms but i have a funny feeling that is rms power

cheers James
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Old 20th March 2012, 07:31 AM   #8
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For that room size small FR drivers with (a) well integrated sub(s) may well be satisfactory. If you're also using this system for music then the "well integrated" becomes even more important, you want the bass and the rest of the sound to smoothly connect. For movies this is slightly less crucial.
Alternatively my first suggestions of 3 Fostex FF225WK (and a supertweeter) for the front, without extra subs required, still stands.

Last edited by talaerts; 20th March 2012 at 07:34 AM.
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Old 20th March 2012, 07:39 AM   #9
Jameslc is offline Jameslc  Australia
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The only worry i have talaerts is the power handling of the drivers for what my pioneer can put out but i am sure there is a way to reduce the output of the amp or maybe not throttle the amp too much
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Old 20th March 2012, 07:43 AM   #10
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don't you worry, unless you play on "jetfighter plane take-off next door" sound levels. Most of the watts will be in the bass part.
usually speakers get damaged quicker by too low power amps than too big amps.
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