Hey guys, I don’t know much about speakers, but I’m looking for a PA system. I need a portable system that needs to have at least 3 prerecorded sounds that I can playback, and would like to have at least 125 DB. It just needs to be kind of a loudspeaker kind of thing with the sound only coming out forward. Pardon my mistakes and if I shouldn’t be posting this here. My budget is around ~150. Thanks guys!
Is that 125dB at 1 meter? I hope so, as 125dB is extremely loud and will cause hearing damage.
What are the prerecorded sounds? Are they fullrange, or limited in bandwidth? That makes a lot of difference.
What are the prerecorded sounds? Are they fullrange, or limited in bandwidth? That makes a lot of difference.
Yes, that would be at 1 meter. All I know is that I would need to have sounds I can record with a mic or something. Also, It just needs to be 12 volts DC, not really portable.
What comes to me in mind is a PA speaker with an inbuilt Mp3 player or Bluetooth.
Player would be Your phone, computer or tablet.
There are portable battery operated systems but they lack power.
Power needs large batteries in order to play for some time.
Player would be Your phone, computer or tablet.
There are portable battery operated systems but they lack power.
Power needs large batteries in order to play for some time.
Sorry, not even close.
This is the absolute cheapest one available at Sweetwater, which is a credible sampling of what´s availble in the market, for U$450.
Other systems went up to U$4500, go figure.
Can do all you want, but 150W RMS and 6" speaker won´t go high in the dB scale.
Access to this page has been denied.
^^^^^DIY Audio can´t open it but if you click on the link it opens in a new page.
Last edited:
What sounds are you recording and playing back. A cheap compression driver and horn driven by an old car amp could be very loud over a limited bandwidth
I could increase my budget a little bit, but not that much. I'm not really looking for a speaker like that, i'm making this speaker act as a horn, so I don't think those expensive speakers would work anyway. I would be hooking it up to my car, so I would have a good supply of 12 volts. Maybe these would work? https://www.amazon.com/LAMPHUS-Soun...jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
https://www.amazon.com/BOSS-Audio-S...25+db+PA+system+for+car&qid=1611679894&sr=8-4
https://www.amazon.com/BOSS-Audio-S...25+db+PA+system+for+car&qid=1611679894&sr=8-4
Where did the 125db requirement come from? That is so loud it will cause instant hearing damage.
Yes, really.
Yes, really.
MP3's , where did the 3 pre-recorded sounds requirement go?
i've a feeling the true intent and purpose is not good...
i've a feeling the true intent and purpose is not good...
That would be at 1 meter. I know these companies almost always lie, but maybe if I buy 2 of these speakers I could get 120 @ 1 meter? https://www.amazon.com/SoundAlert-E...ree-Rebroadcast/dp/B08B3BXZ66?ref_=ast_sto_dp
Flat train,
125dB at one meter within it's limited range of 400 to 4000 Hz appears believable, probably peaking at around 2000Hz, with 400 Hz being 10-20 dB or so less output. A 10dB reduction at 1000Hz sounds "half as loud". Using two horns would increase output around the low frequency cut-off of 400 Hz, but reduce upper off-axis clarity due to comb-filtering. The driver impedance may be low, so adding a second to the SoundAlert unit may not be advisable.
Compression driver re-entrant "speech" horns like this typically can produce in the range of 110dB/1meter midband with just one watt. An example is attached of the Electro-Voice PA-60, which illustrates the response you may see in this type of a device. The PA-60 probably has better low end response than the shorter path length SoundAlert-Emergency device.
The linked SoundAlert unit does not appear to have aux inputs, but as one user wrote:"I soldered the ham radio intercept leads to an aux plug and it plays audio off my phone's headphone jack or my ham radios external speaker jack."
The "Western Safety 50 Watt Megaphone with Safety Siren" (a knock-off of the classic Fanon megaphone which now costs over $200) available at Harbor Freight for $28.99 can put out around 120dB SPL at one meter midband, with a similar peaking response curve. I purchased and tested one of those with the intent of re-using the amp section for a battery operated guitar amp, though ended up selling it after loosing interest in that project..
With a little work, an auxilliary input could be wired to it's microphone input.
It runs on 12V, so it's battery terminals could also be connected (using a fused power point) to a car's battery.
Art
Attachments
Last edited:
Flat train - if you describe the actual wanted coverage (distance/area) and sound pressure for the furthest listener in your intended audience instead of specifying technical requirements, I think you will get better help.
Music played via Megaphones is not so nice to listen to. Is it music or speech you are planning to perform?
//
Music played via Megaphones is not so nice to listen to. Is it music or speech you are planning to perform?
//
There are car horns or alarm horns or sirens that play sounds off an SD card. Not high fidelity, but loud.
For example:
https://www.amazon.com/Waterproof-Electric-Speaker-Warehouse-Playback/dp/B07TD1L72V
Or buy a module like this one and combine with the amp and speaker of your choice:
Switching music module FN BC10 MP3 playback module circuit board 10 channel trigger audio playback board|Replacement Parts & Accessories| - AliExpress
For example:
https://www.amazon.com/Waterproof-Electric-Speaker-Warehouse-Playback/dp/B07TD1L72V
Or buy a module like this one and combine with the amp and speaker of your choice:
Switching music module FN BC10 MP3 playback module circuit board 10 channel trigger audio playback board|Replacement Parts & Accessories| - AliExpress
50W/100V Music quality outdoor horn speaker, IP66
| Edwards Auckland
...but You need a 100V line amp.
| Edwards Auckland
...but You need a 100V line amp.
mp3 is not a kind of sound, its a format, I think you were being asked "what sound quality and frequency range, especially bass extension, are you wanting?"
Sorry for the absence, I have been very busy lately. I found a 70v paging horn from atlas that produces 131db, well over my requirements. I would only be producing a very limited frequency range, so a Paging horn would be perfect. Thanks for your help.
Warn me if you do have a show in my area, so I can leave..
To be honest: Be careful with your performances and that specific paging horn.
my 2 €urocents,
Willem.
To be honest: Be careful with your performances and that specific paging horn.
my 2 €urocents,
Willem.