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Clamshell drivers and WO size (Read 5242 times)
DirtDawg
Ex Member



Re: Clamshell drivers and WO size
Reply #15 - 12/14/05 at 14:20:40
 
[quote author=HT-EXT  link=1134492004/0#13 date=1134565893]Big Air what do you mean by IMHO calmshelling because I am a stup. [/quote]

I found this on computerhope.com one day. I love the name. If you have a computer, you hope it works.
Check it out.  :)

Concrete makes heavy bass really harsh. You might need to use some bass traps to help control reflections and standing waves.

It never hurts to play around with phasing, especially if you have bass to spare.
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« Last Edit: 12/14/05 at 14:24:44 by DirtDawg »  
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HT-EXT
Ex Member



Re: Clamshell drivers and WO size
Reply #16 - 12/14/05 at 15:38:55
 
My main problem when it comes to bass enclosures is how loud will it play. For some reason I want know max SPL right off the bat knowing that I will hardly ever play it that loud. My way of thinking is that if it will put out KILLER SPL that under normal(low volume) listen it will more than adequate. Is this true? Do high output(SPL) enclosures have better low bass, speed , response, room loading even at moderate volumes. I know SPL is not everything but I have a hard time leaving it out.  All info gladly appreciated.
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DirtDawg
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Re: Clamshell drivers and WO size
Reply #17 - 12/14/05 at 17:00:23
 
[quote author=HT-EXT  link=1134492004/15#16 date=1134574735]My main problem when it comes to bass enclosures is how loud will it play........ Do high output(SPL) enclosures have better low bass, speed , response, room loading even at moderate volumes. I know SPL is not everything but I have a hard time leaving it out.  All info gladly appreciated. [/quote]
Well ..... that can be a problem, all right. I have seen the oppostite more often than not. In order to get really high SPL, many concessions are made in sound quality. For instance, most cabinet designs that support the lowest bass are somewhat less efficient in the rest of the range they work in.

As far as speed, I think of a compression driver front horn loaded cabinet, because the lowest frequencies are hitting you at the same time as the rest of the spectrum and there is no group delay at all. All ported cabinets show some group delay, which varies as the frequency changes, usually the lower the frequency the more it lags behind the mid-bass frequencies. That's why you have probably heard that sealed cabinets are cleaner and more dynamic, no delay.

Room loading can change drastically just angling a cabinet a few degrees or moving it a few inches. Where you place your subwoofer cabinet probably has more bearing on how your room is loaded than any other single factor. Adding a second source of pressure with another HWK, will not necessarily make the sound any better, but it can certainly alter the location and intensity of nulls and voids in the sound caused by standing waves. Adding, yet another with a WO complicates things even more.

Talking about response, the most perfectly flat responding driver can be made very uneven, tone-wise by placing it into the wrong cabinet and the most perfect cabinet/driver combo can have many peaks in the response in a certain room or room placement.

Another response that comes to mind is transient response and many large Xmax drivers don't do well following rapidly changing waveforms common to music. Of course with Home Theater, many people don't take clarity and sound quality seriously and a large quanty of bass becomes the quality they are looking for. As someone who watches a movie almost everyday over a fairly clean system, I can tell you that many movies don't have clean, well defined low frequency content to start with. Getting those lows off the disk and over to your listening area is not a simple game to play.

Before you get too crazy with adding more and more cabinets in the room, maybe you should try just one House Wrecker iso loaded with 4 drivers and enough power to really drive the thing, then move it around some and try different locations.
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BigAir
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Re: Clamshell drivers and WO size
Reply #18 - 12/14/05 at 23:28:58
 
[quote author=HT-EXT  link=1134492004/0#13 date=1134565893]Big Air what do you mean by IMHO calmshelling because I am a stup. Also how many Quatros do you use and what amp? What do you consider to be a low fs for a 10" woofer?THANKS
[/quote]

Sorry about that.  "IMHO" means "In My Humble Opinion".......
I would say an fs below 30 is pretty low for a 10.  Right now I'm only using 2 and they're powered by a 400 watt Kenwood amp.   but, I have experimented with clamshelling other drivers and it sounds great.  
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HT-EXT
Ex Member



Re: Clamshell drivers and WO size
Reply #19 - 12/15/05 at 17:18:55
 
No problem BigAir I'm the stup around here but I'm learning. What was the reason you went with 2 Quatros and what is your main use for the WO? Also what size did you settle with on the WO? What other set ups and speakers have you tried?
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« Last Edit: 12/15/05 at 17:20:35 by Joe_Eaton »  
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BigAir
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Re: Clamshell drivers and WO size
Reply #20 - 12/16/05 at 01:17:51
 
I sold 2 of the quatros to a friend of mine.  :'(
The rest of the system is simple stock Blazer.  The reason I went with the quatros was because they had very close specs to Steve's drivers. I can't say if they are a better deal or not because I haven't tried Steve's drivers yet. My WO is 36x30
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HT-EXT
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Re: Clamshell drivers and WO size
Reply #21 - 12/16/05 at 10:53:45
 
THANKS BigAir for the reply. I was curious to your WO's performance. I take it you are using the WO for car audio. Usually with car audio SPL contest are common. Have you ever check to see what the WO is putting out. Can you give me an idea of the SPL and how low you think your set up can go? I am very interested in the Quatro speakers and would like to have an idea of their performance. THANKS
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« Last Edit: 12/16/05 at 10:54:21 by Joe_Eaton »  
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J_Rock
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Re: Clamshell drivers and WO size
Reply #22 - 12/16/05 at 17:41:36
 
well, I don't have quattros like Big Air.  But my WO uses 2 infinity 10 inch reference series subs.  In car they will hit at least 126 db on dash with windows up.  That is at half volume.  I have never been able to meter above that point, since it was the highest mic I can find without shelling out some cash.  But I would safely assume 140 db is being hit with 800 w max power.

and as far as how low.  My WO hits 20hz 4 db down from 60hz which is where WO flattens out considerably.
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