How Loud is a Police siren?

How Loud is a Police siren? and is it only outside its not from the interior's correct?

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I guess that guy has subs.

Most police sirens produce about 120db at 10 feet (with a 100 watt amplifier.)

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Lolzitsmtss,

I work in the EV Business... There's cheap ones, there's the good ones.  Loudest is the 200 watt Federal Signal "Q" electronic siren.  It's a processor unit the size of a 2000 watt amplifier that produces sounds exactly like the older mechanical "Q" sirens of the old days (and still made).

How loud is it?  It hurts the ears if you're not wearing ear protectors even standing behind the vehicle.

Sean

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Emergency Vehicle Technician
Got Freedom? Thank a vet!

Do they put extra soundproofing above the headliners in police cruisers? I spent a Saturday night a few weekends ago putting styrofoam insulation above the headliner in my Envoy (no, I don't have a siren ;) ). GMC feels fit to "insulate" the roofs of their SUVs with this new miracle product called Thin Air.  

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No, no soundproofing at all.  Are you thinking that's where they put the speaker at?  It used to be in the old days where they mounted them in the lightbar.  It was abandoned due to OSHA for the officers.

They are now mounted in front of the vehicle.

Syrafoam in headliners?  Have you heard of Dynamax?

Sean

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Emergency Vehicle Technician
Got Freedom? Thank a vet!

No, in the old days, the speaker was on the roof...

Now they are mounted up front to protect occupants from the noise.

Syrafoam in the headliner?  Haven't you heard of dynamax?  It's made specifically to deaden sound.

Sean - EVConcepts

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Emergency Vehicle Technician
Got Freedom? Thank a vet!

Sorry, thought it didn't get posted so I wrote it up again!

Pressing key ONCE,...

Sean

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Emergency Vehicle Technician
Got Freedom? Thank a vet!

mobilevt wrote:

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Syrafoam in headliners?  Have you heard of Dynamax?

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Dynamat costs too much. I used one 4X8' sheet of this stuff for the entire roof: https://www.lowes.com/lkn?action=productDetail&productid=15348-122-15348

It cost me about $10, plus some duct tape to hold it in place until I put the headliner back up.

Check out these prices at Crutchfield for Dynamat: https://www.crutchfield.com/S-HaTdBwERi64/cgi-bin/Prodgroup.asp?g=181250&cc=01&search=dynamat

Granted it can be found cheaper at other online stores, but 32 square feet of Dynamat products there costs anywhere from $133 to $533.

The styrofoam board insulates against sound and heat at the same time. Most of the Dynamat products don't. Plus, several of these products would have to be pieced together to provide the area coverage the styrofoam board did in seven large easy-to-cut panels.

Plus, it satisfied my addiction to buy things at Lowe's or Home Depot. For one night, anyway.

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Oops, left this out. I've also insulated the doors and side panels with a double layer of this underlayment product: https://www.homedepot.com/prel80/HDUS/EN_US/shop_cart/pg_print_product.jsp?CNTTYPE=PROD_META&CNTKEY=shop_cart/pg_print_product.jsp&BV_SessionID=@@@@1957918192.1093650238@@@@&BV_EngineID=ccdladcmgimjdejcgelceffdfgidgnj.0&MID=9876&prod_id=807113

The picture isn't the actual product at Home Depot. It's a green foam roll with little holes scattered along one surface. It sticks to itself pretty well when "fresh" and can be held in place with duct tape until the interior panels are put back in place. I've dropped the A-weighted road and wind noise on the same stretch of highway at 70 mph about 8 dB by insulating everything but the floor pans with these two products. It too a little over 2 rolls of this product and one sheet of the styrofoam insulation from the previous post. Maybe $70-80 total, including 2 rolls of duct tape. If I had used Dynamat to do all that it would have been hideously expensive.

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But delphidoc, the stuff you mentioned does nothing to absorb subwoofer resonance in the sheet metal.  All it does is insulate against road noise.  Would be fine to keep out a wailing siren, but in most installations of aftermarket equipment it wouldn't do the job.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

I understand what you're saying about vibration dampening, but I don't have a sub. I'm OLD- just ask my kids.

Actually I've thought about getting one eventually, but even then it's not going to be much. I imagine something on the order of a Bazooka amplified tube sub would do for me. *ducks* Right now I'm just trying to get the noise down. It's incredible how loud an SUV is going down the highway compared to a passenger car. I agree Dynamat is supposed to be excellent for what you're talking about, but it would be to expensive for what I'm trying to do.

BTW, who else makes "minimal" subs similar to what Bazooka sells? And does anybody have any suggestions for cutting down the noise that side-view mirrors make?

Sorry for getting so far off topic.

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That's okay about the topic...it was brought out of retirement anyway.  But doc, I'm old too (49) and I've got a subwoofer.  You wouldn't know how it sounds in the plain jane mom-n-pop sedan until you get in...it's barely heard outside (thanks to a product I used that costs 1/4 of what Dynamat costs...).  I just run 200 watts at 4 ohm to it.  But with the right music it feels like I'm in one of those old Barcaloungers with the vibrator, and sounds smooth as silk.  It puts the smile on my face on those rare occasions when I can get the car away from my wife.  And it was a lot of fun to design and build the enclosure for it.  I would never give up the satisfaction of putting it all together by buying a pre-made sub kit.

And wind noise whipping around the mirrors?  You got me.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.