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Old 27th April 2016, 09:26 AM   #1
bego2 is offline bego2  Croatia
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Default Two midbass drivers in one box

Hi guys, I have a few questions about building a speaker towers with two mid bass drivers and tweeter. Two mid bass drivers im planning to use are identical. There is a few things that I dont understand, if i have two identical drivers how do I connect them, I would use 8 ohm drivers, so parallel, thats 4 ohms, than how I make crossover? Like i would make for 4 ohm driver or? And the question about TW, Is it a problem to use a 8 ohm TW here, because I have two at home. Any suggestion ?

Thanks.
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Old 27th April 2016, 10:22 AM   #2
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Yes for a 2-way design you would wire them in parallel to achieve a nominal 4ohm load, then you would design the crossover as if it were one driver with half the impedance.

It is no problem to use drivers with different nominal impedances in the same speaker as long as you design the crossover filters to suit each driver. You will also have to deal with the different sensitivities of the drivers.

Note that even though your drivers are 'nominal' 8ohm, they may not actually be 8ohm at the frequency you wish to cross them. The most simplistic way of dealing with this would be to inspect the impedance graph in the datasheets and use the impedance at the crossover frequency to use in your crossover filter calculation.

Last edited by TMM; 27th April 2016 at 10:24 AM.
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Old 27th April 2016, 05:35 PM   #3
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Hi Bego,

I suggest you play with XSim, it's a crossover simulator that is a great way to learn and try out different configurations. You can get data files from Dayton on their drivers and try to create virtual speakers to learn about the process and parts, without spending any money at all. For instance, your questions about impedance, and series vs. parallel could be tested out there.

Using the ZMA (impedance files) you can also learn about the complexities of driver impedance, and how it all combines with a crossover for the final impedance curves.

Best,


Erik
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Old 27th April 2016, 06:27 PM   #4
bego2 is offline bego2  Croatia
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thanks guys, in those two answers I have everything I need to know. I now about sensitivity. cheeeers.

One more Q. Im thinking to buy these drivers, two per box.

http://www.visaton.de/en/chassis_zub...n/w170s_8.html

What do you think for a box volume? I want it to play from 40ish to 4000hz... dance, hause, vocal music, trance..similar music...
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Last edited by bego2; 27th April 2016 at 06:56 PM.
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Old 27th April 2016, 11:10 PM   #5
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well, 2 x 8ohm drivers now seem to be +6db with the same 2.83v.
so the 2 of them (in parallel) look like a 4ohm driver with 92db.
Since running them in parallel and stacked (not mtm), I'd cross definitely @ or below 2khz.

floppy qts on the driver.
I'd assume 5mm xmax.

if the specs seem true, 2 of them go into a 3.2ft3 box (91 Litres) and have an F3 around 49hz.

If you want to go deeper but have less output before bottoming out the drivers, you could do 6ft3 tuned to around 28hz.

Last edited by norman bates; 27th April 2016 at 11:13 PM.
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Old 28th April 2016, 11:57 AM   #6
Lojzek is online now Lojzek  Croatia
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Quote:
Originally Posted by bego2 View Post
What do you think for a box volume? I want it to play from 40ish
to 4000hz... dance, hause, vocal music, trance..similar music...
Hello countryman!

I have been working with Visaton W170 S-8 once and I still have the
measured TS parameters. Use simulation software like UniBox
or Jeff's Woofer Box Model and Circuit Designer.

software

Attached Images
File Type: jpg Visaton W170S-8.jpg (102.3 KB, 219 views)
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Old 28th April 2016, 08:46 PM   #7
bego2 is offline bego2  Croatia
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Quote:
Originally Posted by norman bates View Post
well, 2 x 8ohm drivers now seem to be +6db with the same 2.83v.
so the 2 of them (in parallel) look like a 4ohm driver with 92db.
Since running them in parallel and stacked (not mtm), I'd cross definitely @ or below 2khz.

floppy qts on the driver.
I'd assume 5mm xmax.

if the specs seem true, 2 of them go into a 3.2ft3 box (91 Litres) and have an F3 around 49hz.

If you want to go deeper but have less output before bottoming out the drivers, you could do 6ft3 tuned to around 28hz.

that sounds great, I have monacor dt-254 twiteer that plays good from 2k hz

MONACOR - Products: DT-254

Quote:
Originally Posted by Lojzek View Post
Hello countryman!

I have been working with Visaton W170 S-8 once and I still have the
measured TS parameters. Use simulation software like UniBox
or Jeff's Woofer Box Model and Circuit Designer.

software

Thx Lojzek, that helped toooo
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Old 28th April 2016, 09:23 PM   #8
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with a qts .67, you'd need a way bigger box for ideal.
Forget ported for them.

sealed 3ft3 might give a bit of bump under 100hz, you'd have to run the simulations.
But that bump may give the impression of less lower bass.

np. what we do here.
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Old 30th April 2016, 08:27 PM   #9
bego2 is offline bego2  Croatia
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So what you said about 3.2ft3 box (91 Litres) you meant a sealed box?
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Old 1st May 2016, 04:39 AM   #10
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Yea, it's smaller than ideal, but you don't usually have much choice with high qts drivers.
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