Nearfield Monitors with 5 or 6.5" woofer

[gug42]

Hello,


I never heard speakers in closed box ... Probably because all commercial solutions want to "display" 45 Hz - 20 KHz ..
I must do some calculation, perhaps 20Liters will be a little bigger...

Nice speakers. Thank you guys !

 

[Bigun]

...
--sealed 0.6ft^3 produces -F3 =62Hz...

Is 62Hz low enough to integrated to a mono subwoofer, i.e. a 2.1 system. This could be a flexible solution.

 

[Bangla H]

morel ultimate uw 1058

A cabinet design with 20-21 Liters (0.7-0.75cuft) completely empty, ends up close to 17 Liters (0.6cuft) after adding the speakers + crossover parts + bracing + port tube. Internal sound absorption material like fiberglass and wool will increase the effective volume.

LineSource:Thank you for the input to correcting my idea.

Is 62Hz low enough to integrated to a mono subwoofer, i.e. a 2.1 system. This could be a flexible solution.

As Bigun suggested i have an UW1058, now very expensive with neodym, in sealed cabinet (48 Liter) with partnership to sold monitor.
New way could evened with SB17.

 

[gug42]

Hello,

Indeed you are right ! you could go up to 70/75 hz without too much positioning and directivity trouble.
Well I cloud start with the rabbitz small speaker with the 4" woofer (Xmax = 10mm ) and after add a sub ...?

The soprano is in my budget, low profile, and seems to be a really good quality/price
http://www.diyaudio.com/forums/mult...udspeaker-design-suggestions.html#post5509414

thank you

 

[Patrick Bateman]

I just bought a pair of these:

I love DIY, but for $300 a pair these Behringer B2030As are tough to beat. These are the smaller version of the speakers that trumped the Linkwitz Orions in a listening test.

 

[Bangla H]

SB12 ACL by Udo

Hi gug.
Congrats to your choice.
Please show your progress or result if finished.
Here a different way for same speakers.
Construction by our oldest(?) and creative DIY guy Udo.
SB 12 ACL – Lautsprecher selber bauen

 

[gug42]

Hey guys,

@Patrick Bateman : Yes you are probably right less fun, a sure result, probably less costly ...... But less pleasure too.

@Bangla : Thank. I will need some times to go in ... I've got another huge project ... building two boxes around 170 Liters for two pairs of beyma SM112N. I need to learn about vent calculation ... hard time for me ... But that's another story ...

 

[gug42]

Well I'm on rabbitz design ! I have a few question about it :

- Any data about the air self ? Resistance ?
- Any advice about the inside ? matter and quantitiy needed ?
- Any good reseller of the drivers in Europe ?


Thank you !

 

[Bigun]

I think you should go with the Rabbitz design - anything to draw him back into the hobby would be good because Hugh always said Rabbitz had some good designs but no activity for a long time....

 

[rabbitz]

Well I'm on rabbitz design ! I have a few question about it :

- Any data about the air self ? Resistance ?
- Any advice about the inside ? matter and quantitiy needed ?
- Any good reseller of the drivers in Europe ?


Thank you !

The Soprano is not my design but I have suggested it as it is a great little speaker that is suitable for near field. The design is by Jeff Bagby.

I'm not sure I understand your questions but will give some information. The midwoofer holes need to be chamfered on the inside to help with air flow as these are a small driver. For damping I glue 6mm felt (such as ironing board underlay) inside for the top, bottom and side panels. Damping (I used Jantzen 014-0410) is then used behind the drivers in an L-shape as shown in the link below.
Kit in Australia - Page 3 - diyAudio
Wadding

As the speaker has small panels there is no bracing required but I have cleats on the back to allow for a removable back panel as well as it adds mass to the end of the top, bottom and side panels.

I've added some links and pictures for reference.

http://www.diyspeakerforum.com/viewtopic.php?f=2&t=8

http://techtalk.parts-express.com/forum/speaker-project-gallery/56956-sopranos-jeff-bagby-build-log

https://meniscusaudio.com/product/soprano-pair/

I've added a drawing of mine for reference which is different to Jeff's speaker which is 165W x 267H x 203D made from 18mm mdf. Please note that the woofer rebate is deeper than the driver due to the thick gasket and on later builds I've rebated to 7mm.

Hope this helps.

 

[norman bates]

Patrick,
Put a ring of foam around the lip of the horn and it will sound even better.

 

[gug42]

Hello,

Thank you ! This kind of information I was looking for
Well in my damping stock I have :
- Thibaude 8mm
- cotton wool metisse 100mm, something close too glass wool
- joint foam

Thank you again.

 

[Bangla H]

Europe Reseller

Hi gug.


You would badly find better prices here then Intertechnik offers.
I add a little list here.

 

[LineSource]

Since box size seems as important as sound quality to you....
A 6" SB17MFC35-8 midwoofer in a sealed cabinet constructed of 0.75" plywood with 0.6cuft TOTAL EMPTY VOLUME would not need bracing and produces -F3=64.5Hz before room gain.
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Many hi-end monitors use rounds/bevels edge treatment to reduce baffle edge distortion. Sound quality is important to professionals.