New Zealand guys path to improving the camp boom box

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Berlina117
Posts: 4
Joined: Tue Jun 11, 2019 2:52 am

New Zealand guys path to improving the camp boom box

#1 Post by Berlina117 » Wed Jun 12, 2019 6:14 am

Hello.
Ryan Here. New Zealand guy living in Melbourne. We have a good scene here of bush parties. Out in the whops, far away from anyone whoi cares about sound levels. A few years back I had the great idea of building a portable sound system. One that can be setup at the campsite, or moved around on a trolley. My version 1 was IMO a success. Ive had a few unforgettable moments where people are connected to the music and having a good boggie. Its all car audio stuff, a 3 way system, measures 24inches high, 24 inches deep, and 40 inches wide. It runs 2x soundstream R3.8 8inch woofers, and 4x Focal ps165 a 6.5inch midrange speaker, which include 4x tweeters. All speakers are in sealed enclosures sized to the speakers. It has 2x amplifiers, and 1 heavy as AGM 130AH battery. With a full charge, it runs for about 4-5hrs full throttle. I love it. If you can tell me howto share photos id happily do so.

I am a builder by trade, so should have no trouble building any enclosure. Ive spent many hours infront of folded horns and would love to do folded horns for my subwoofers.

My quest is to build a version 2 boom box. Improving the efficiency of my existing speakers. Id like to work with the hardware i already own. Version 1 is just sealed box simple design, id like to push design further in V2. keeping to a simmilar overall size to version 1. So compact is the main focus here. Been looking at the designs here, and the Tall Auto Tuba dimensions are perfect for my plans. However I think my soundstream r3.8 woofers dont spec right for the enclosure. My frequency range for the subwoofer enclosure is roughly 50hz to 120hz. Does anyone have recommendations for an efficient enclosure for my existing 8inch woofers, preferably horn.


existing subwoofers x2

https://soundstream.com/product/r3-8/



Soundstream R3-8
Imp. (Ohm) D2
Re 2.2122
Fs (Hz) 39
Qes 1.3713
Qms 7.1915
Qts 1.1517
Le (mH) 0.9283
Diam 8
Vas (L) 18.392
BL 7.3081
Mms (g) 134.9398
Sen (db) 80.77
RMS 500
Mounting D 5 1/4"
CutOut Diam 7.8"

Thanks for your time.

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Bill Fitzmaurice
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Re: New Zealand guys path to improving the camp boom box

#2 Post by Bill Fitzmaurice » Wed Jun 12, 2019 7:02 am

Those woofers are not suited to horn loading, the specs are well outside what's required.

Rich4349
Posts: 645
Joined: Wed Jul 30, 2008 10:18 am
Location: Kankakee, IL

Re: New Zealand guys path to improving the camp boom box

#3 Post by Rich4349 » Wed Jun 12, 2019 8:05 am

Also, there is Hoffman's iron law:

Low
Loud
Small

You get to pick two, any two, no more, though.
2 DR250s, 2 27" Lab15 T-60s, 2 30" Neo Titan 39s, 1 Autotuba...and looking for more!

Grant Bunter
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Joined: Mon Nov 28, 2011 11:12 am
Location: Ilfracombe Queensland Australia
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Re: New Zealand guys path to improving the camp boom box

#4 Post by Grant Bunter » Wed Jun 12, 2019 3:41 pm

G'day and welcome to the forum :)

I don't know what you know about speaker building, but specific designs are designed around the TS specs of the driver.
That's a wishy washy way of saying the right driver in the design will work best.
The issue for us antipodeans is getting the right driver at reasonable costs.
I can't find anyone in Australia still selling tang band drivers, so look up parts express in the US and see if you can cope with getting them shipped in.
Both these are recommended drivers:
https://www.parts-express.com/tang-band ... r--264-854
https://www.parts-express.com/dayton-au ... m--295-200

The Dayton above is also available in Australia:
http://www.theloudspeakerkit.com/dayton ... ofer-4-ohm
Costs more, but, no 10% added on overseas transaction, no shipping from the US, and should have Aussie warranty.

Wagner's stock that driver too.

In a perfect world, you'd find 2 x suitable 8 ohm drivers to build 2 tall AT cabs wired in parallel for a 4 ohm load to your amp.

That not only increases efficiency in terms of the cabs, but also placed the lowest requirement on your power supply.
Horn loading is certainly the way to go though, the same or greater output with less power...
Built:
DR 250: x 2 (melded array) with March 2012 plans. 2 more under way with CD horn
T39's: 4 x 20" BP102 , 2 x 28" 3012lf.
WH8: x 3 with melded array.
Bunter's Audio and Lighting "like"s would be most appreciated...

CoronaOperator
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Joined: Wed Mar 25, 2009 7:07 pm
Location: Medicine Hat, Alberta, Canada

Re: New Zealand guys path to improving the camp boom box

#5 Post by CoronaOperator » Wed Jun 12, 2019 5:02 pm

Berlina117 wrote:
Wed Jun 12, 2019 6:14 am
measures 24inches high, 24 inches deep, and 40 inches wide.
If you want an all-in-one-box solution how about an omni 12 fullrange tallboy with the 2x10" option. Smaller than you have now and way louder. Or go hard and build an omni 15 fullrange tallboy with the 2 x 12" option. The 2 x options will get you a lower impedance to help with your 12v power limitations. I reckon these boxes will go at least 20 dB's louder than you have now.

Put 2 big 4" or 5" castors on the back corners and a handle on the top and you can wheel it around rough terrain one handed.
Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience

Berlina117
Posts: 4
Joined: Tue Jun 11, 2019 2:52 am

Re: New Zealand guys path to improving the camp boom box

#6 Post by Berlina117 » Thu Jun 13, 2019 3:07 am

Thanks for the quick replies, this is a lively forum . I do understand drivers and design are joint at the hip. was pushing my luck in the hopes of matching a horn to my existing drivers, But maybe il use them for another project.

Thanks
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Berlina117
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Joined: Tue Jun 11, 2019 2:52 am

Re: New Zealand guys path to improving the camp boom box

#7 Post by Berlina117 » Thu Jun 13, 2019 6:10 am

I am open to buying new woofers

Berlina117
Posts: 4
Joined: Tue Jun 11, 2019 2:52 am

Re: New Zealand guys path to improving the camp boom box

#8 Post by Berlina117 » Mon Jun 17, 2019 8:46 pm

Wagner's stock that driver too.

In a perfect world, you'd find 2 x suitable 8 ohm drivers to build 2 tall AT cabs wired in parallel for a 4 ohm load to your amp.

That not only increases efficiency in terms of the cabs, but also placed the lowest requirement on your power supply.
Horn loading is certainly the way to go though, the same or greater output with less power...
[/quote]


Thnks for the info.

Through your infor i found Wagners online ebay store, he stocks this driver.

DCS205-4 8" Classic Subwoofer 4 Ohm for about $100 aud. I guess this is my best driver option for the tall auto tubas for purchasing inside australia? Think il buy the plans and go from there.
Thanks

ACUA
Posts: 276
Joined: Sun Sep 25, 2016 6:21 pm

Re: New Zealand guys path to improving the camp boom box

#9 Post by ACUA » Tue Jun 18, 2019 1:02 am

Horns may not solve everyone’s problems but they have solved many of mine
Advanced concepts underground audio

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