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PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

Need some help planning a CHEAP PA setup!
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Old 27th May 2019, 01:46 PM   #51
KaffiMann is offline KaffiMann  Norway
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Need some help planning a CHEAP PA setup!
SubSoniks, I ordered 18 small sheets of melamine foam, 400*300*25mm
18 Tiles Acoustic Absorption Melamine Foam Panel Sound Treatment | eBay

The cheapest I could find, useable size, melamine foam that ships to Norway.

Norway is like the backwoods in terms of international shipping, crazy expensive and halfway outside the EU postal and trade regulations... We are part of European Economical Area, but not European Union.
European Economic Area - Wikipedia

So not everyone on Ebay send stuff here.

Anyway, you want me to have a double layer of these boards, the one closest to the 12-250TC should have a hole roughly slightly smaller than the big wizzer, and the outer layer closest to the grill should have a hole slightly smaller than the size of the small wizzer?
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Old 27th May 2019, 03:54 PM   #52
SubSoniks is offline SubSoniks  Wales
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Large hole equal to diameter of the large whizzer, the small hole can be anything from 25mm - 100mm, depends on loss v dispersion of HF, ideally try both 2 layers and three layers with different hole sizes. I am currently going from 125mm to 25mm over a 65mm thickness of foam.
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Old 28th May 2019, 12:08 AM   #53
phri is offline phri  Australia
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Indonesia isn't such a backwards country anymore. IMO not much to find in Norway which isn't available in Bali!! just saying. Denpasar has PA specialists and buying local will make future repairs way more simple. An example of local stuff see: Contact – X9PROAUDIO
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Old 28th May 2019, 10:21 AM   #54
Guerilla is online now Guerilla  Denmark
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Originally Posted by KaffiMann View Post
ASX50 is 22watts in 8ohm, ...
Oh. I thought all Ice were powerfull
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Old 28th May 2019, 12:49 PM   #55
KaffiMann is offline KaffiMann  Norway
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Indonesia isn't such a backwards country anymore. IMO not much to find in Norway which isn't available in Bali!! just saying. Denpasar has PA specialists and buying local will make future repairs way more simple. An example of local stuff see: Contact – X9PROAUDIO
I'm not saying Indonesia is a backwards country. People just have different priorities due to income and time restrictions.
I know there's electronics stuff around, but it's more expensive and smaller selection. And I see no reasonably priced alternative to the design I will make with the Fane 12-250TC.

The reason I wanted to ask in the PA section was that perhaps someone had experience making cheap but loud diy setups, now I've learned that the PA section is more about off the shelf stuff.

And I am keeping myself well away from Denpasar, I put more value on my time than using it to stand still in traffic. Will get a local woodworker to make the boxes in Bangli or closer to Kintamani, support local craftsmen for sure.
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Old 4th June 2019, 06:59 AM   #56
KaffiMann is offline KaffiMann  Norway
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First for all the non native English speaking folks, dispersion is not the dame as coverage angle when used in acoustics. Dispersion is the property that allows a prism to separate the colors of light. It refers to the fact in some media high frequencies travel faster than the lower ones. This does not occur in mono atomic gases. In real air it is affected by the humidity.
I somewhat agree, but in many Germanic languages and for instance in Norwegian the term "Spredning" can be used, perhaps in correlation with "vinkel", so "Spredningsvinkel". I guess the more accurate translations would actually be "Spread" and "angle", so "Spread-angle" or "cover-angle" may seem like a good word.
However, I feel that this is not the most optimal use of words, because the "spreading" of sound is never uniform, and you also have increasingly higher loss of sound in relation to distance for higher frequencies/lower frequencies go further, this might suggest that there is actually some form of "dispersion" going on (fluid dynamics, gases etc).

I understand that the term "cover-angle" *could* be used as a term, especially in relation to PA where you're looking to "cover" a specific area with sound, but somehow I do not see it as an accurate enough description for what sound is, and does.

Maybe we should have a more in-depth discussion of this topic.

Last edited by KaffiMann; 4th June 2019 at 07:24 AM.
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Old 4th June 2019, 10:29 AM   #57
Guerilla is online now Guerilla  Denmark
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I do believe norvegian is euroasian and stems alot from horsepeople migrated via the silkroad from what is now known as Afghanistan akording to newer studies. The same thing with. Viking culture and mythology. Only their original Thor had a thunderbolt instead of a hammer. Sirry for way off topic
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Old 9th June 2019, 09:50 AM   #58
ICG is offline ICG  Germany
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Originally Posted by KaffiMann View Post
The A800 has no fan = silent operation, and it has balanced + unbalanced inputs and Speakon + screw terminals for backup.

If someone manages to screw up and break stuff, I see value in the seemingly redundant connectivity options of the A800, as well as less chance of failure should something happen to the fan and some failsafe circuit on the NX1000D engages.
The connectivity is an argument but on the other hand, you have to use real brute force to kill the XLR plugs. If they poop out, the RCAs will be gone long before.

Bali can get quite hot. Most amplifiers are not made to work in tropical conditions and will have big problems dissipating the heat. I'd really suggest to add a fan on each side and probably for the power supply too. That applies not only to the A800 but to all amps.

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And the ASX50 is 22watts in 8ohm, so then I might as well just bring a couple TPA3250 as backup/plan B, because they're so nice and compact, and also just sitting on my shelf.
But thank you for mentioning it, ASX50 are nice Class D modules and it's a reasonable price.
Well, maybe bring a few fans too and buck converters. Both are pretty cheap and with adjusting the voltage you can reduce the noise even of cheap fans a lot, most of the cases to not being audible.
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Old 13th June 2019, 12:25 PM   #59
KaffiMann is offline KaffiMann  Norway
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I expect the XLR sockets to last forever, the XLR sockets would be the natural backup in any case. The RCA sockets are the most likely to be used, and the most likely to be abused... Not really expecting brute force to be applied, but I've learned to expect the unexpected.

Not that hot in Bali, at least not in Kintamani, last time I was there it was mostly between 15-20c indoors, even in the hotter areas it's not too bad. Think "room temperature" and you're not that far off. Houses are built to cool, as opposed to here where houses are built to insulate.
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Old 13th June 2019, 02:47 PM   #60
ICG is offline ICG  Germany
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Originally Posted by KaffiMann View Post
I expect the XLR sockets to last forever, the XLR sockets would be the natural backup in any case. The RCA sockets are the most likely to be used, and the most likely to be abused... Not really expecting brute force to be applied, but I've learned to expect the unexpected.
Yes, it's more likely on the XLRs the cables will break much sooner than the socket or plugs. And I agree, it's even more likely the RCAs will be killed rather earlier than later.

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Not that hot in Bali, at least not in Kintamani, last time I was there it was mostly between 15-20c indoors, even in the hotter areas it's not too bad. Think "room temperature" and you're not that far off. Houses are built to cool, as opposed to here where houses are built to insulate.
Okay, but that brings another issue with it because it's less than 20km away from the coast, you'll likely have to deal with salty air, which reduces the lifespan of electronics vastly.
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