question for soundman or anyone ?

[la Huerta]

you know i think us woodworkers willl all end up deaf, we love noise ie;power tools, machinery, v8's and home theatre with grunt...


the loudspeaker kit site has a floorstanding model almost the same as the jv60, same 6.5 in drivers anyway, would be good to build using what i have , but there is no info on the crossover or box size...

[la Huerta]

this guy here has he jv60, http://users.bigpond.net.au/builty/index.html

looks like a mean system, 3 subs too...



questions?...how can and what can be done, that effects sound by the attachment of the drivers and tweeter to the box ie; would recessing them change sound, putting some rubber between the driver and the box, and what about installation, would quality of the damping material effect sound too...

all good question hey !

[Harry72]

Which JC double mag 15" are you refering to... the only one they stock is $99 and the amp is $329... $428.
They did have a 15" equivalent a few years ago to the double mag 12"... is that the one you are refering too?

I reckon LSK's 15 is a Dayton driver.

[la Huerta]

yeh mate, i was refering to the 15in they used to have , guess not anymore...altronics has a beauty, no price though...

i thing the LSK'S is a Dayon too, can't seem to find anyone selling just the driver though to check the price...

[Harry72]

http://www.partsexpress.com/webpage....ID=114#drivers

[la Huerta]

looks good but ausi supplierr would be better...

[Harry72]

There isnt!

[la Huerta]

alrighty then...i'll check postage cost from the US...or i'll go to altronics...

many thanks for your reply ...

[Master Splinter]

You can get a Shiva subwoofer in Australia from here. Add a 300 watt jaycar plate amp (that'll give you the ability to tweak the crossover points). Check that your dental fillings have a replacement policy.

Shiva reviews here.

[la Huerta]

thanks Master S....hose sites are fantastic, brain overload stuff !!





another good question for all...

...which would be a better option,

2 seperated 12in powered subs or 1x15in sub, i'm assuming the amount of air moved in a room by 2 12in would be greater than that of 1 15in, and possibly more even sound L+R ....i could maybe even build the boxes to the same size footprint as the jv60's (to the volume required for the 12in driver of cause) and combine the 2, it would still be 2 seperated units but just look like one...?

looking at some of the required box volumes for some of the 15in and there 1 huge enclosure, 200ltr, to big for my loungeroom ...

[GraemeCook]

looks good but ausi supplierr would be better...

Have you tried www.speakerbits.com.au of Melbourne.

Graeme

[Harry72]

MSplinter that oz suppiler is where my shiva come from... link is quoted earlier(post#13!)
la Huerta the shiva can move lots of air, more than 90% of sub's availabe even beat most 15's... has very good xmax(cone stroke distance) for a oldish designed sub.
Honestly most people #### themselfs the 1st time they are assulted by a shiva!
Dont always assume bigger dia cone moves more air the xmax is also needed to approximate output... xmax X sd = theorectial output

[Master Splinter]

Personally, I would go for a single 12" Shiva. If for no other reason than fitting a cabinet the size of a fridge in the living room is a bit tricky.

Adire Audio (the makers of the Shiva) have some very good info on speakers.

Two 12" subs are, for practical purposes, unnecessary. You dont need them for stereo effects (a 75hz sound in air has a wavelength of 4.5 meters, so it should be pretty hard to localise the sub).

But for real low frequency response (down to a few hertz) you need a subsonic actuator such as the Aura Interactor talked about here.

[lnt9000]

Hey guys every time I mail aranmaracoustics they are out of stock on the 12" shiva, by the way their email service aint workin' anymore, anyone know of an alternate supplier?

[rcw]

That does originally come from the Jaycar website, and I am the one who posted it.

On Rod Elliots site 'ESP" you will find articles that describe the QB5 filter assisted alignments.
Speaker systems that have small drivers such as the Jaycar ones with p17s cannot go down in bass as far as is claimed in frequency response specs with ought producing gross distortion,and are not capable of meeting the "hi fi" standard level of 90db. with 110db. at the lowest frequencies, at all in most cases, the jvc 60 being one.
As outlined, in professional audio the qb5 II filter assisted alignments, ( that allow the full voice coil rating of the drivers to be used with ought exceeding the linear cone excursion), are used, and can be easily made with a modification to the box tuning and the use of the high pass filter built into 5.1 receivers and plate amps and these greatly increase the output you can get before the loudspeaker system starts to sound strained.