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Need some help planning a CHEAP PA setup!
Need some help planning a CHEAP PA setup!
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Old 17th May 2019, 09:10 PM   #41
pelanj is offline pelanj  Czech Republic
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I did a quick test of the t.racks DSP 4x4 mini and EPQ304. It was used as crossover and bass and high end EQ. It is not too noisy and the amplifier is quite silent, too. The only disadvantage of this combination is the fan noise. I actually think about getting a second DSP and a larger power 4ch amp to power my 4way home PA stack. And a minor disadvantage is, that the maximum crossover slope is 24 dB/oct. All in all, I think it could be a nice budget setup with the 12" Fanes (which are still in the boxes).
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Old 22nd May 2019, 07:02 AM   #42
KaffiMann is offline KaffiMann  Norway
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Need some help planning a CHEAP PA setup!
Thank you for the information pelanj. I am trying to avoid fans on the amp, still undecided on amplifier. I ordered a ready made TPA3255 that *should* be here before the airplane lifts off. It may be that it's not up to spec though, varying production quality and all that.
I do have some very nice TPA3250 left over, and a couple 3116 kits that are preserved by a thick layer of dust.
Actually considering something like the Yamaha R-N303D even if it's a bit big, because it would be a more flexible input source, and there's integrated DAB and FM tuners.

Still undecided, it's only the 12-250TC + speaker grills and OCF that are 100% go.
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Old 22nd May 2019, 11:53 AM   #43
SubSoniks is offline SubSoniks  Wales
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Quote:
Originally Posted by KaffiMann View Post
Thank you for the information pelanj. I am trying to avoid fans on the amp, still undecided on amplifier. I ordered a ready made TPA3255 that *should* be here before the airplane lifts off. It may be that it's not up to spec though, varying production quality and all that.
I do have some very nice TPA3250 left over, and a couple 3116 kits that are preserved by a thick layer of dust.
Actually considering something like the Yamaha R-N303D even if it's a bit big, because it would be a more flexible input source, and there's integrated DAB and FM tuners.

Still undecided, it's only the 12-250TC + speaker grills and OCF that are 100% go.
Re OCF: approx 65mm thick, cut cone shaped hole, inner = mid cone diameter (125mm IIRC), outer hole 25-50mm, depending on acceptable losses v HF dispersion. Lots of room to play with thickness and hole sizes. Try and make the foam overhang the edge of the driver equal or greater than the thickness of foam.

I would say that melamine acoustic foam would be the best for this.
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Old 22nd May 2019, 07:47 PM   #44
KaffiMann is offline KaffiMann  Norway
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Need some help planning a CHEAP PA setup!
Thank you, I really appreciate the information.
I was thinking of using this stuff:
https://www.biltema.no/bil---mc/bils...stk-2000018639

It's cheap, readily available, made from polyurethane. and I thought the egg crate pattern would perhaps work in place of holes, since I will have to attach it to the inside of these speaker grills, I will have to cut away varying amounts on the crate peaks. Whatever foam is left will not be very thick.
Gitter Hifi 12 - Ljudia

Do you know where I can look for the melamine foam?
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Old 22nd May 2019, 08:02 PM   #45
SubSoniks is offline SubSoniks  Wales
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Lots of suppliers in the UK, Basotect is a brand name of BASF who had the patent. Just making holes in foam of varying thickness will not work. Melamine foam also has a more suitable absorbtion coefficient.
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Old 22nd May 2019, 08:46 PM   #46
KaffiMann is offline KaffiMann  Norway
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Need some help planning a CHEAP PA setup!
Here's the cheapest 7cm thickness Basotect I can find, there seems to be nothing for sale locally.
MUSIC STORE - Noiseflex Absorber 50x100x 7cm Basotect Classic, hellgrau | eBay

30 euros + 20 euros in shipping from Germany, will have to pay taxes and fees on top of that.

Edit:
Replacing the Melamine OCF with some 3cm wool felt that I have laying about is very tempting right now.

Last edited by KaffiMann; 22nd May 2019 at 08:56 PM.
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Old 23rd May 2019, 07:56 AM   #47
SubSoniks is offline SubSoniks  Wales
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Polyurethane open cell fire retardant foam works, not quite as good a spec as melamine, you should be able to find that a lot more available and cheaper, if you buy a big sheet of 10mm then you can layer it between 2 very open grills.

These people will cut a sheet down, not sure i they will sell part sheets as they cut it themselves off of a big block:

Grey Melamine Foam Sheets 1200MM X 1200MM X 25MM - Acoustafoam

This ebay seller is cheap but only in 25mm thickness but still doable if will post to you:

6 Tiles Acoustic Absorption Melamine Foam Panel Sound Treatment | eBay

Another place to try:
Melamine Foam – Wilhams Insulation


2 packs would more than do it, although you would have to go with either 50mm or 75mm, but again doable.

You could try felt but I'm guessing it will absorb more of the low mid before the highs are dealt with, rockwool will likely absorb to much of the low mid from the specs I've seen but might work.

As you have the felt, could you not try a couple of layers taped over one of your 15-300tc's?

Last edited by SubSoniks; 23rd May 2019 at 08:06 AM.
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Old 23rd May 2019, 09:07 AM   #48
KaffiMann is offline KaffiMann  Norway
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Need some help planning a CHEAP PA setup!
... Those magic cleaning sponges are made from melamine, and I can get them very cheap, everywhere. I will grab a pack and try out on the 12-250TC when they get here maybe early next week, just ordered the drivers and grills + some cheap compact led lights.

We are in a moving house process, and my beloved FC152 are packed away for another two horrible weeks... Temporarily replaced with some MA 10.2 and a couple Beyma 12BR70, not compareable at all! Much worse off axis, lacks detail, and for the "un-initiated" bass may seem impressive, but completely lacking the highly addictive dynamic sound of my 6x15" setup...
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Old 26th May 2019, 05:18 AM   #49
Guerilla is offline Guerilla  Denmark
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Some guy on FB group has 2 asx50 icemodules for 230 volt. For 600 dkk. If interested I can connect you
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Old 27th May 2019, 06:33 AM   #50
KaffiMann is offline KaffiMann  Norway
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Need some help planning a CHEAP PA setup!
I'm out of cash, just bought water filters and proper first aid kits (not a humanitarian effort, just stuff they actually do not have there).

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.
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