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Old 3rd February 2014, 02:52 PM   #1
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Default SoundBar

First time here, so Im looking for some opinions. I have built some boxes in the past, but like most dummies, I just built it without much thought. Im planning on building a soundbar at full range. I want to know if my plan will work and what one should I go with. Either build will have two hook ups in the back, since this is coming directly from the tv, and it has a left and right set up. The first idea I had was L/C/R, and the other is just L/R.
For speakers, I plan to use Hivi B3Nís and do a combination of parallel and series wiring. Hopefully I did it right.
For the L/C/R, I was going to port the L/R and seal the middle. For the L/R, I was going to give each half 1 port. For tuning purposes, I chose 60Hz, no real reason, but was kinda following this build Homemade soundbar/ Stand (zvox beater)

Thank in advance for any help you guys can provide.
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Old 3rd February 2014, 11:50 PM   #2
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Hello Fair. i think a soundbar build is an excellent gateway to DIY.......but even when working with fullrange drivers, there's some basic principles you still need to follow.
Now you're pictures.........what you DON'T want to do is put two fullrange drivers side by side working the same passband. You'll end up with destructive comb filtering at the higher frequencies making vocal intelligence terrible. You'd be FAR better served with three drivers...one each for left, right and center.........and in lies the inherent problem with fullrange drivers......SPL and power handling limits as well as low frequency response limits.

In speaker design, it's always a tradeoff and you have to manage them as the designer. So how do we/you combat the SPL/Bass limitations? Examining commercial offerings shows that it's pretty easy....just add a subwoofer. There's the power of DIY that allows you to design, build and integrate a subwoofer that fits your needs/space. I wouldn't ask ANY or these small format fullrangers to go below 200hz.....and even that's pushing it. Another tradeoff as now your limited to a subwoofer within close proximity or two subs.....which is the far better option of two smaller subwoofer placed close by. The small internal volume limits of a soundbar are actually a plus if you don't have unreasonable expectations. You can make a soundbar thats really thin, wide, long...whatever fits your space......just avoid the pitfall of looking for low frequency extension from it.

On another note, there's now FAR better options for fullrange drivers than the HiVi you proposed. Check out the Vifa TC9 or the offerings form Fountek. If you use less drivers as i mentioned, you'll have saved enough for three Fountek FR88's or 89's.......which would be my first choice by far. When crossed over to a subwoofer(s) and relieved of LF handling, these little drivers can get staggeringly loud!

Hope this helps your quest......enjoy.
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Old 4th February 2014, 01:42 AM   #3
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I know I will never get any real bass from these drivers, just looking to improve my tv sound in the man room. And I plan to add a sub in the future. But thanks for the ideas and I will look into it.
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Old 4th February 2014, 02:06 AM   #4
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+1 on 3 drivers for LCR. With the same budget you can afford better drivers. I'd suggest Mark Audio Alpair 6.2p.

We built one for a client. Works well. You will end up with empty space in the bar, you might just build 3 small cabinets.

dave
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Old 4th February 2014, 08:31 PM   #5
thedoc is offline thedoc  United States
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3 speakers is the way to go. I recently built a budget soundbar and sub system for my parents. I used Visaton FRS8-8 for the soundbar and a Dayton DC160-8 woofer for the sub.

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Old 4th February 2014, 10:03 PM   #6
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by planet10 View Post
+1 on 3 drivers for LCR. With the same budget you can afford better drivers. I'd suggest Mark Audio Alpair 6.2p.

We built one for a client. Works well. You will end up with empty space in the bar, you might just build 3 small cabinets.

dave

in the case mentioned above (Alpair 6P throughout) , a pair of small storage compartments were incorporated between the 3 small enclosures for the front row 3 - wall mounted with aluminum Z-clips

the dual drivers are SDX7 woofers - also wall mounted
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Old 5th February 2014, 03:05 AM   #7
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Since this isnt hooked up to an amp, and the tv really just puts out a L/R (witch is 2 hook ups). Should I make one box mtm or make 2 boxes mtm (which they would make one big box with a baffle). And what size speakers would you recommend? I know this is going to be a great soundbar, just looking to improve the tv
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Old 5th February 2014, 03:55 AM   #8
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MTMs should never be sideways.

dave
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Old 5th February 2014, 04:14 AM   #9
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chrisb you mentioned recently that you had tried to make 2 channel audio work with movies and abandoned that approach eventually. Is there a thread where the problem is worked through? I'm no fan of rear channel monkey business but I can see three channel, especially since the original RCA (I think) stereo included a center track, so it's old school enough to appeal to an old man.
Thanks
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Old 5th February 2014, 06:13 AM   #10
chrisb is offline chrisb  Canada
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well first of all, I think one needs to differentiate between attempts at "realistic" reproduction of music - how many discrete channels are required to attain that would be a whole other conversation - some might opine that 3 for domestic purposes was an arbitrary figure based on available technology at the time - anyone remember the "Quadraphonic wars" some 20 or so years later? - some audio formats die for a combination of any number of good reasons (pre-recorded Elcassettes, anyone?) - and for what to me is the agreed upon contrived artifice of the "home cinema experience" - again the question "how many channels - what's it up to now, 12.4 or some such silliness ?" (oops, did I digress again?)

good luck with that distinction

Basically, what I found with 2 channel for movies was that by and large the soundtrack mixing was based on coupling visual images with precise location of audio - whether for dialogue or sound "effects" , and that even in small to moderate sized rooms, 3 discrete speakers in the front row did a much more convincing job of anchoring to the visual image than 2 with a phantom centre . I certainly would have preferred that not be the case, but once I heard multi channel "cinema" done reasonably half-a$$ed, there was no going back.

After using this system to test drive a lot of other speakers over the past 2 yrs, I've come to the conclusion that the centre is the most important channel, with consistent voicing across the front row following close behind.

Proper placement and EQ/level setting - now almost child's play (or should I say "seniors' proof" ? ) with the likes of Audyssey, etc - makes for a much more seamless envelope, even with very modest speakers in smallish rooms.

FWIW, I find the rear /surround "monkey business" most convincing when you don't think it's contributing and toggle it off - it's like the video resolution dropped back down to 480, and who wants that?
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Last edited by chrisb; 5th February 2014 at 06:17 AM.
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