How should I wire my 1500 watt speakers?

[punkrokr1701]

and one more thing, what exactly is excursion and how does is effect a speakers performance?

[pinkmouse]

You might want to read this thread before you go any further. I think the design goals of that project are very similar to yours.

[sreten]

Originally posted by punkrokr1701
and one more thing,
what exactly is excursion and how does is effect a speakers performance?

Hi,

Excursion is how far a cone can move linearly, mutiplied by the
effective piston diameter this gives drivers volume displacement.

Power handling of drivers has two regions - low frequencies where
the excursion limits are reached - and higher frequencies where
excursion is low and the thermal limits are reached.

Maximum bass output of a driver is related to its volume dispacement.
Its sensitivity tells you how much juice is needed to achieve maximum.

However maximum upper bass is related to sensitivity x amplifier
power so balancing the two issues is needed in a design.

/sreten.

[Nanook]

For loudspeakers please consider these:

Parts Express Magna Cum Laude

All the tough work's been done , and you can buy all the required stuff (less enclosures) from Part's Express with the click of a button. I think in the same $$ neighbourhood ( or a little cheaper when you consider the cost of good quality cross over components)as your original idea, with 2 bass drivers (12" each I think), a single mid and a single tweeter, but designed around each other. Cross over plans are on the page. Easy ordering

For an amp the choices are greater. I'd personally like to see you move towards a better quality amplifier, but if Pro sound is what you're after , perhaps a big T amp? Carver B stock is available for near the same price as a Numark, and I'm pretty sure the Carver Pro stuff is better built. A good Crown , or Behringer would probably work out nicely too. I think the price leader of these three is the Behringer. Years ago Crown had a "Micro Reference amp" that was very powerful and very good.

Without going "nuts" in the power department, just 'cause something says 1500 watts, it really isn't. Games get played regarding specifications. A good quality 250 Watter (per channel) will slay the Numark amp you linked to. Used Brystons (a minimum of a 3B is required--100 watts RMS 20-20kHz, .0015 % THD or something like that, but a 20 year , retroactive warranty available) can be used as Arc welders, so they'll push tons of current. An industry standard for over 30 years.

With a little luck you can do this , and do it well. If you don't want to build something and get used or "B " stock items then dj123 site has some amp /speaker packages that should fit the bill and many cost less than $1000. Of note is the DJ Power Pack, with good quality JBL speakers, and a powerfull Crown XLS-602 amplifier.

As far as learning all this stuff, unfortunately some time is required. A really good place to start is with Vance Dickenson's "Loudspeaker Design Cookbook"-- available online and in bookstores. The majority of topics are covered pretty well, but no actual projects are presented.

good night all

:-)

[pinkmouse]

They look like a nice project and an ideal solution.

[sreten]

Hi,

The co-axials PM referred to are no longer available.

For $500 in parts (including the crossover) checkout :

http://www.partsexpress.com/projects...gna/index.html

I'd try this with your existing amplifier, the above has a very good
combination of decent sensitivity and very high bass power handling,
7mm xmax one way for each 12" driver is not too shabby at all, for
this type of speaker I'd say its exceptional.

(note : in the low bass the above will play 6dB louder than the
Selenium drivers posted due to the excursion, xmax being double)

If you do build it, I'd add some additional cabinet bracing.

/sreten.

[AndrewT]

Hi Punkrok,
give us a brief. (three or four posters have asked)

Something like
I want to play music (or party or film sound effects or.....) to my friends (or to myself or to a big crowd or to ......) in a small room (or in a really big room or ..... ) tell us the size. I want it to sound nice or to have boom boom bass or back ground (very unlikely) etc.

Then you do a bit of research to develop a specification to meet the targets set in your brief. We will help you to develop the specification.

Do not start at the wrong end!!!! learn!!!!
Do not select drivers or amplifiers before the brief or specification or targeted research.

Does this brief, specification, research, ideas, develop, build model, review/evaluate remind you of anything?
It's the way everyone should develop a project (any project) and it gets taught in school, for a reason!

[lndm]

What Nanook said

[tinitus]

punk...., You still plan with multiple tweeters, allthough clearly stated several times that you should only use one

First rule....make it as simple as possible.....less and smaller/cheaper components in crossover.....better sound

With two 12" woofers you could use a midrange horn looking something like this, it goes from 1500hz to 10khz, and then ad a tweeterhorn above that - many 12" are just as good as 10" in lower midrange....simplicity....good sound

With midrange/tweeter section placed on top in a seperate caseing, you can easily make changes when you can afford the more expencive stuff

http://www.partsexpress.com/pe/pshow...TOKEN=75287687

[sreten]

Hi all,

I think the concencus is the "Magna Cum, Laude" for the job.
Any further debate without some sensible feedback is pointless.



2 x12" bass, 6.5" mid, 1" tweeter, ~ 93dB/W, ~ 300W = ~ 117dB.
If thats not enough then a full professional PA design is needed.

sreten.