PDA

View Full Version : Got a couple of fast question !



SQBubble
09-27-2006, 04:20 PM
1. Does 6 drivers @ 8ohm make a final load of 4ohm?

2. What if 7 drivers @ 8ohm, what's the final load?

3. Can I connect 6drivers or 7drivers on one http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=260-144 , i want 5 or 6drivers respectively play 3000hz and below, the last driver play all the above

4. How do I high pass the woofers crossed 3000hz and below?

5. What good brand of home audio amplifier/receiver are the best bang for the buck that does around 150rms @4ohm, of course more is better but i find that they are all expensive, and don't know what is good in home audio, I need something that will control gain/volume/hpf and eq if possible and aux input for connecting to computer for around 250$ ...

brandontw
09-27-2006, 06:02 PM
Well, there is two ways of connecting drivers together: Series and Parallel- Series doubles the impedence and parallel halfs it for every driver added.

**Edited due to apparent stupidity**

To cross the mids off below 3000, youll need a crossover that cuts them off at 3000

i dont know about the amp, shop around.

brandontw
09-27-2006, 06:07 PM
WTF are you trying to build? a line array?

you can use 6 drivers, and make groups of three wired in parallel, then wire those groups in series to get ann 8 ohm load... i think.

Then for the tweeters, use tweeters, mabye one, mabye more. then that crossover.

CBFryman2
09-27-2006, 06:10 PM
1.)6 8ohm drivers in parallel is NOT 1ohm or 0.5ohm

16 8ohm drivers is 0.5ohm

6 ohm drivers is 1.33 ohm

CBFryman2
09-27-2006, 06:10 PM
2.) Learn Ohm's law

CBFryman2
09-27-2006, 06:13 PM
3.) Yes But wire to 5.33333 ohm

4.) Passive Xover called a Capasitor to high pass, inductor to lowpass

5.) cant help you there. High end Pioneer, Yamaha, etc....cant go wrong if you pay for it in most cases.

SQBubble
09-27-2006, 06:17 PM
i wanna build 2little towers with

6 Aura NS3-193-8A1(3")
and
1 USHER 9950C-15 1inch tweeter(1")

thylantyr
09-27-2006, 06:44 PM
1. You want to use a 1" tweeter.
2. You want to use one Aura 3" high passed at 3khz ?
3. You want to use five Aura 3" low passed at 3khz ?

If so, this is a strange recipe.

Try;

A. Connect all the 3" drivers to do the same job.

or

B. Use one 3" driver low pass ~ 3khz. Use the remainder of the 3" drivers low pass ~ 500hz for bass support.

A or B depends on tweeter / 3" driver synergy. You have sensitivity issues to
figure out.

SQBubble
09-27-2006, 07:04 PM
1. You want to use a 1" tweeter.
2. You want to use one Aura 3" high passed at 3khz ?
3. You want to use five Aura 3" low passed at 3khz ?

If so, this is a strange recipe.

Try;

A. Connect all the 3" drivers to do the same job.

or

B. Use one 3" driver low pass ~ 3khz. Use the remainder of the 3" drivers low pass ~ 500hz for bass support.

A or B depends on tweeter / 3" driver synergy. You have sensitivity issues to
figure out.

yes the 3" 's will all play 3000hz and below to 80hz
tweeter =3000hz and up

as for sensivity, i thought 6 3" would be enough to catch up to the tweeter ..it is not enough?

SQBubble
09-27-2006, 07:58 PM
if I get 7 AURA and 1tweeter all in 8ohm, final load in SERIes, it would be 2ohm right?with box and all itll go around 3ohm?

JimJ
09-27-2006, 09:17 PM
Impedance rise is a little different beast for apps like this...not quite as easy for a subwoofer enclosure that only plays a narrow bandwidth.

The only way you're going to find a receiver that does a real 150W @ 4ohms for that price is going to be something vintage, and it may be just an integrated amp...not that there's anything wrong with that at all :) Often times you'll find it's cheaper to build high efficiency speakers and use less power. Thy takes that approach one step further and mates insane amounts of power to the already-HE system :D

SQBubble
09-27-2006, 09:23 PM
ya i realized:crap:
i think imma pay for this amplifier
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=302-603&scqty=1
looks like nice quality and will live more than 3years, plus its 2ohm stable..guess imma stick with that amplifier/receiver

so wut about the setup im about to do?
2x 7aura 3" and 1usher or any good tweeter 1"..
all 8ohm so 2ohm final load..
in sealed box
will it sound good ?

JimJ
09-27-2006, 09:26 PM
That's not a receiver, it's a power amplifier...so you can't select different sources, change the volume, adjust any tone controls, etc. Meant for if you have a preamp in front of it in the signal chain - not to mention that $400 for that kind of power really isn't all that impressive.

ballstothewall
09-27-2006, 09:29 PM
Dang, I'm getting QSC amps for cheaper than that, and a hella lot more power too.

SQBubble
09-27-2006, 09:40 PM
shyt, loll
im a newb with home audioooo:crap:

holy
i just found this
http://cgi.ebay.ca/TECHNICAL-PRO-HYBRID-1000w-AMPLIFIER-RADIO-PRE-AMP-EQ_W0QQitemZ270033136595QQihZ017QQcategoryZ3280QQr dZ1QQcmdZViewItem#ebayphotohosting

this thing is freakin awsome for the price, but i dont understand how it is rated, its as if it was 1channel how they rated

any input on that thing?

JimJ
09-27-2006, 10:10 PM
I'd stay away...far, far away...

JimJ
09-27-2006, 10:14 PM
http://cls.audiogon.com/cgi-bin/cls.pl?miscrcvr&1163970180
http://cls.audiogon.com/cgi-bin/cls.pl?miscrcvr&1163209960
http://cls.audiogon.com/cgi-bin/cls.pl?miscrcvr&1163095746
http://cls.audiogon.com/cgi-bin/cls.pl?miscrcvr&1163007993

For 8 ohm loads...if you're committed to going with 2 ohms, you're looking at using a seperates system, no real way around that. Some sort of preamp and pro audio rackmount power amplifiers.

thylantyr
09-27-2006, 10:26 PM
i wanna build 2little towers with

6 Aura NS3-193-8A1(3")
and
1 USHER 9950C-15 1inch tweeter(1")

Those midwoofers cost $20. You are going to spend $240 just
for midwoofers for two towers?

Aura sensitivity is 80dB.

Usher sensitivity is 88dB.

6 mids gives you ~ 7.78dB
6 mids wired for 5.3 ohms gives you ~ 1.7 dB
Sum of both = 9.5dB

80dB + 9.5dB = 89.5dB

That should mate well to the tweeter.

If the budget is $240 for midwoofers, why not just build a proven design
like the modulas on HTguide using Dayton RS midwoofers costing $30 each?
... because the speakers boxes are too big and you want to make small towers?
http://www.htguide.com/forum/forumdisplay.php4?f=39

SQBubble
09-27-2006, 10:43 PM
Those midwoofers cost $20. You are going to spend $240 just
for midwoofers for two towers?

Aura sensitivity is 80dB.

Usher sensitivity is 88dB.

6 mids gives you ~ 7.78dB
6 mids wired for 5.3 ohms gives you ~ 1.7 dB
Sum of both = 9.5dB

80dB + 9.5dB = 89.5dB

That should mate well to the tweeter.

If the budget is $240 for midwoofers, why not just build a proven design
like the modulas on HTguide using Dayton RS midwoofers costing $30 each?
... because the speakers boxes are too big and you want to make small towers?
http://www.htguide.com/forum/forumdisplay.php4?f=39

well.
yea I want small towers, its for my room(~850cu.ft), right now i have 2different computer speakers and one mini-sony system all connected to my computer...(6mids-high and 2subs.) doesnt sound right at all and it takes too much space, pisses me off..

so i wanna do 2small powerful towers to put as "computer speakers" and hopefully 1 18"sub in the back later on, and take off all the BS i have now, its for music and movies...

brandontw
09-27-2006, 10:58 PM
If the budget is $240 for midwoofers, why not just build a proven design
like the modulas on HTguide using Dayton RS midwoofers costing $30 each?

I agree... 240 dollars is alot for a gamble.. my line arrays were easy to gamble with, becasue the mids were only 49 cent apeice. If i were spending as much as you are on speakers i would either just buy some, or build a tested design, especially scince you dont know what your doing(no offense, i dont either)

SQBubble
09-27-2006, 11:12 PM
I agree... 240 dollars is alot for a gamble.. my line arrays were easy to gamble with, becasue the mids were only 49 cent apeice. If i were spending as much as you are on speakers i would either just buy some, or build a tested design, especially scince you dont know what your doing(no offense, i dont either)

loll

its more like I know wut I want .
I want something that would sound good first of all, Looks good and doesnt take much space ! The surround on those 3" looks way to good/beefy and will match with the room (size I have to work with)...and Aura is known for SQ with their NRT technology...also, u get wut u pay for.

So i dont really mind spending on good stuff..

The thing that is pissing me off is crossover setting and amplifier receiver all those things..

SQBubble
09-27-2006, 11:28 PM
I'd stay away...far, far away...

how can u know it isnt good?

brandontw
09-28-2006, 03:38 AM
how can u know it isnt good?

bad brand, and like you said...you get what you pay for.

brandontw
09-28-2006, 04:02 AM
For 300 dollars, you could get a pretty fine set of speakers, that would probably look and sound better that something you would build out of 3" aura's

http://cgi.ebay.com/WHARFEDALE-Diamond-9-2-Brand-NEW-Loudspeakers-pair_W0QQitemZ320030888939QQihZ011QQcategoryZ14991 QQrdZ1QQcmdZViewItem
http://cgi.ebay.com/Klipsch-RS-25-Speakers-1-pair-Brand-New-FREE-SHIPPING_W0QQitemZ140034238305QQihZ004QQcategoryZ1 4996QQrdZ1QQcmdZViewItem
http://cgi.ebay.com/Athena-WS-100-High-Style-Speakers-BRAND-NEW-IN-BOX_W0QQitemZ120035855795QQihZ002QQcategoryZ32861Q QrdZ1QQcmdZViewItem
http://cgi.ebay.com/MORDAUNT-SHORT-MS912-Bookshelf-Speakers-Black-NEW-PAIR_W0QQitemZ160033628288QQihZ006QQcategoryZ14991 QQrdZ1QQcmdZViewItem

thylantyr
09-28-2006, 11:27 AM
loll

its more like I know wut I want .
I want something that would sound good first of all, Looks good and doesnt take much space ! The surround on those 3" looks way to good/beefy and will match with the room (size I have to work with)...and Aura is known for SQ with their NRT technology...also, u get wut u pay for.

So i dont really mind spending on good stuff..

The thing that is pissing me off is crossover setting and amplifier receiver all those things..

This is what I would do. Think hard on how big you can make your speakers
and see if a normal midwoofer will fit into your plans. You want to use the midwoofer for normal midrange and woofer duty. There is nothing interesting
about the $20 Aura 3" midwoofers.

*sensitivity is dog at 80dB.

*Xmax is 3 mm... so?

*Aluminum dome. Probably the worse recipe for midrange SQ. The best SQ
comes from paper treated cones, esoteric cones like Kevlar, magnesium, aluminum, have
nasty breakup modes and you can't operate those up to 3khz.

*NRT neodymium magnet system - Neo magnets are cool, but a moot issue
really. Neo offer high magnetic field in smaller size than other magnets, but
we aren't concerned with magnet size are we? Given the fact that they
use neo and their sensitivity is 80dB, that tells me it's a poor design.


A good SQ recipe is to find a dome tweeter that can hang with a 2khz crossover point,
if your dome can do 1500hz - 1700 hz with a steep slope, this opens the doors to allow
you to consider the esoteric cones, otherwise you need treated paper cone mids if you want
ultimate SQ.

A cone treated 4" NSB (49 cent driver buyout from PE, now soldout) would
probably perform just as good as those Aura drivers, perhaps better.
$3 (six) NSB + $5 lacquer > $240 Aura. Port the NSB for bass extension.
That is money spent wisely.

I'm sure you can make this system work using Aura drivers, I'm sure
I could too, but there has to be a more efficient way to get the job done.

Here is the new McIntosh array using what appears to be a bunch of Aura drivers.
http://www.shows.soundstagelive.com/shows/avtour2005/sep11b/mcintosh_speaker_2.jpg

http://www.mcintoshlabs.com/mcprod/shopdisplayproducts.asp?hid=&id=20&cat=Loudspeaker+Systems&prodid=1114&product=XRT2K

Sixty-Four 2" Titanium Midranges

Here's the sad part of the design -> 2.8V/1m: 89dB

110 drivers and they can only manage 89dB sensitivity.

My budget line array is rated for 104dB sensitiivity. LOL

Just because McIntosh uses Aura mids doesn't make them smart designers.

If you can 'go big', pm me for a recipe idea {TM, MTM, TMM}

ballstothewall
09-28-2006, 12:01 PM
A good tweet that will drop down to around the 2khz is the Morel MDT29.

Flipx99
09-28-2006, 12:08 PM
OT, taken to PMs