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Enclosure size for stereo drivers in one enclosure? Passive radiator size?
Enclosure size for stereo drivers in one enclosure? Passive radiator size?
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Old 10th November 2017, 04:45 PM   #1
skuliaxe is offline skuliaxe  Sweden
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Default Enclosure size for stereo drivers in one enclosure? Passive radiator size?

As I am very new to speaker building, I would appreciate any suggestions or feedback on my first project.

My goal is to have a speaker for daily music listening. Something similar to Sonos Play 3 or 5 but it's way more fun/giving making my own speaker paired with Chromecast Audio. I would start with one speaker and once I have good results I could replicate the results and add speakers throughout the home for music listening. This is also one of the reasons for the concrete, once I have good results I will have the mold that I can use again and again.

Notes for the full range speaker:
  • Is In one concrete enclosure, similar to this which is my inspiration. But as pointed out, this will not be easy...
  • Keep the size to a minimum or close to Sonos Play:5, but larger if required for lower frequencies (Sonos Play:5 has multiple drivers to achieve the full range in a small package)
  • Simple left right drivers (possibly passive radiators) and no 2-way with crossover for now as this is my first build.

Drivers I am considering are 2x Tang Band W5-2106 (Scroll down to find them). I was also looking into Tang Band W5-2143, but the Tang Band W5-2106 have a slightly larger frequency range.

Questions I have are the following...

A) How would I calculate the size of the box? Most calculators I have found (like this one) seem to calculate for 1 driver in 1 enclosure. How can I calculate the size for Vented/ported vs Passive Radiator if there are 2 drivers in 1 enclosure?

B) I assume that by using passive radiators I can have the box smaller? Which is one of my goals but without risking much of the sound quality. If I choose to use a passive radiator, will one of Dayton Audio SD175-PR suffice in a single enclosure with 2x drivers from above? The web page states "Recommended for use in passive radiator enclosure alignments with active drivers from 3" to 6.5" in diameter." I assume that the statement is true if 2x 5" drivers are used with 1x passive radiator.

Thanks for any feedback

Last edited by skuliaxe; 10th November 2017 at 07:57 PM. Reason: More details
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Old 10th November 2017, 05:47 PM   #2
Richidoo is offline Richidoo  United States
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WinISD version 0.7 has good simulation of passive radiators. You can set it to simulate multiple active and passive radiators per enclosure.

Thin concrete rings like a bell. Don't be deceived by basement walls which are very thick and damped by earth. Crossbraced stiff birch plywood, lined with bitumen is very good. Or thin birch plywood laminated to equal thickness MDF with greenglue is excellent, easy and inexpensive. edit: Maybe coat the nonresonant plywood box with concrete slurry as paint.

Last edited by Richidoo; 10th November 2017 at 05:49 PM. Reason: concrete paint
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Old 10th November 2017, 06:08 PM   #3
Cal Weldon is offline Cal Weldon  Canada
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Enclosure size for stereo drivers in one enclosure? Passive radiator size?
As a minimum, always one size up the PR. IOW, for one 5" driver, consider one 6.5" PR.
I'm not sure you want to combine the two drivers in an open cabinet with a single PR as you have asked.
Also, building from concrete is labour intensive and unnecessary, IMO.
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Old 10th November 2017, 06:14 PM   #4
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by skuliaxe View Post
As I am very new to speaker building, I would appreciate any suggestions or feedback on my first project.
Rip it up and start again, seriously Everything seems wrong to me. What is it you want from your speakers?
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Old 10th November 2017, 06:46 PM   #5
planet10 is offline planet10  Canada
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Enclosure size for stereo drivers in one enclosure? Passive radiator size?
Each driver should be in their own sub-enclosure so you can calculate for one driver and then siamese 2 boxes together.

I am not a big fan of PRs. They can be considered as a vent substitute in a small box, tuned low where the vent becomes too large. You need to consider the driver and the box alignment before considering one.

I haven’t had a lot of TBs thru here, the small sample i have had have not resonated with me for one reason or another. I can offer opionions on alignments.

You can get reasonable bass out of the Mark Audion Pluvia 7 in a smallish (5 litre net) box for a reasonable price, but the extension increases as you increase the volume up to the (optimal fo rmy alignment) of 13 litres.

I concur with the opions on concrete… unless you are a concrete guru, you will be ahead if you use good plywood.

dave
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Old 10th November 2017, 07:55 PM   #6
skuliaxe is offline skuliaxe  Sweden
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I've updated my initial post with more detail and mostly about what my goal is...

"My goal is to have a speaker for daily music listening. Something similar to Sonos Play 3 or 5 but it's way more fun/giving making my own speaker paired with Chromecast Audio. I would start with one speaker and once I have good results I could replicate the results and add speakers throughout the home for music listening. This is also one of the reasons for the concrete, once I have good results I will have the mold that I can use again and again."


Quote:
Originally Posted by Richidoo
WinISD version 0.7 has good simulation of passive radiators...
Thanks will give it a try.

Quote:
Originally Posted by Cal Weldon
..for one 5" driver, consider one 6.5" PR.
I'm not sure you want to combine the two drivers in an open cabinet with a single PR as you have asked...
Thanks. Same as planet10 pointed out.

Quote:
Originally Posted by scottjoplin
Rip it up and start again, seriously Everything seems wrong to me. What is it you want from your speakers?
True, I'm just getting started with the planning and will of course have to learn much more before starting. Have started reading more guides.

Quote:
Originally Posted by planet10
Each driver should be in their own sub-enclosure so you can calculate for one driver and then siamese 2 boxes together.
That's a good point and I could have one speaker but have the enclosure split in 2 sections.

**Edit**
I just hit edit on the original post and the link sent me to an "unregistered blank page". Going back, then the original post is no longer there?!?

Last edited by skuliaxe; 10th November 2017 at 08:01 PM.
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Old 10th November 2017, 08:22 PM   #7
scottjoplin is offline scottjoplin  Wales
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Yes, just noticed that myself. If you report your last post the moderators may be able to reinstate it, not sure
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Old 10th November 2017, 08:27 PM   #8
planet10 is offline planet10  Canada
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Enclosure size for stereo drivers in one enclosure? Passive radiator size?
If you edit a post while still under moderation (typically the 1st 5) the edited post will go into the moderation queue and be invisible to all but moderators until the changes are approved.

It should be fine now.

dave
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Old 10th November 2017, 09:02 PM   #9
scottjoplin is offline scottjoplin  Wales
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Perhaps look into something like a soundbar? If you want a single small cabinet this could at least be a way of getting some stereo image if desired. Ported or a transmission line is an alternative to PR
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