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wayne- lab12 available [message #42362]

Fri, 05 September 2003 00:09

toxicport.e
Messages: 48
Registered: May 2009

Baron

Choice
-a labsub with ONE lab12,

-or a labsub with ONE lab12 + flare extension

or-

-my own basshorn with lab12woofer

i know the labsub is the best way to go,but will be abit wobbly response if its used as a sofa NEAR not in proper corner position..

i can only afford ONE lab12 per box,dont need PA levels of output and wont be using 2kw.

should i take the hard road and use my own LONG horn ? its hard to optimise internal volume :-S
thanks

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Use it as a direct radiator [message #42363 is a reply to message #42362]

Fri, 05 September 2003 03:19

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

The LABhorn comes on-line at 30Hz. Below that, its LAB12 woofers are direct radiators in a fancy box. If the goal is bass between 30Hz and 100Hz, then the LABhorn works well. But using it at frequencies below that is not wise, in my opinion. And it is physically large, which is not convenient for use in home. So to me, it makes no sense to use a LABhorn for home hifi or home theater.

It would be much better to use a few smaller subs distributed in the room to smooth room modes. So my suggestion is to take the same pair of LAB12 drivers you might have put into a LABhorn and put them in 4.5ft3 cabinets port tuned to 20Hz. Overlap them with the woofers in your mains giving you four bass sound sources, distributed throughout the room. This will give you plenty of bass energy, and it will average the energy throughout the room in the modal region giving smooth bass response.

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Re: Use it [message #42364 is a reply to message #42363]

Fri, 05 September 2003 03:55

toxicport.e
Messages: 48
Registered: May 2009

Baron

20hz=90db/1watt
30hz=106db/1watt

so its JUST worth it
i see your point though.

well what il do,is try the lab12 woofer in ported 3cu ft ,22hz tuning, with 350watt. if that doesnt cure my bass appetite,i know what will -
the previously mentioned 25hz
*super mega blast super sized basshorn*

no matter what i do,my mate needs one anyway because he will have some sort of horn design..

thanks
_mike

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My Lab-12 experience [message #42365 is a reply to message #42363]

Fri, 05 September 2003 03:56

wunhuanglo
Messages: 912
Registered: May 2009

Illuminati (2nd Degree)

I've tried the Lab-12 in both vented and closed enclosures. The vented enlsoure was varied by progressively filling space with expanding foam to try different volumes/tunings.

I found the closed box, front firing to be best in my room. Down firing (slot loading) was just way too much. The reflex box had mega output, but I couldn't find a configuration that was musical.

The Adire site (the Shiva people) has load of plans for boxes of all sizes. Once you decide on a size, downloading their plans takes all the thinking out of how to build it.

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Re: Use it [message #42367 is a reply to message #42364]

Fri, 05 September 2003 12:57

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

The nice thing for you is that you can make a larger - Something that is dedicated to your listening room. The larger size will help a great deal and you can probably reach your goal. I just don't think it makes sense to use a 30Hz horn down to 20Hz. It is best to avoid going below the passband with a basshorn, in my opinion.

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Passive radiators [message #42369 is a reply to message #42365]

Fri, 05 September 2003 13:21

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

Do the Adire plans you've mentioned include passive radiators in some of the designs? Seems like Nick at Lambda uses them a lot, and I think these companies are somewhat cooperative in their approaches. For small drivers with massive cones, it's probably hard to duct-tune a small box low enough.

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Re: Passive radiators [message #42370 is a reply to message #42369]

Fri, 05 September 2003 20:00

wunhuanglo
Messages: 912
Registered: May 2009

Illuminati (2nd Degree)

I've only paid attention to the ported and sealed boxes - I never considered a passive radiator - but I don't remember seeing any designs with them.

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Other possibities [message #42373 is a reply to message #42370]

Sat, 06 September 2003 00:24

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

I've never fooled around with passive radiators either. But since Vas of the LAB12 isn't very high, I expect cabinet size wouldn't be large either. So tuning a system with a single driver might have been problematic using a duct.

Might go with an EBS alignment that uses a larger cabinet, but that would probably put fl down in the single digits or low teens. I'm not sure there would be much energy down there with a 12" driver regardless of its tuning, but I haven't checked either.

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Re: Other possibities [message #42374 is a reply to message #42373]

Sat, 06 September 2003 03:42

toxicport.e
Messages: 48
Registered: May 2009

Baron

100-125Litres gives nice response flat to mid 20s
7.62cm port dia =22cm long -quick DOSBOX calc for 100L
but isnt long! my port on jbl 175L 33hz is 42cm,and it was gona be 65 or so if i wanted a 10cm high port for extra area.

ofcourse id use a huge port for

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