How Loud is a Police siren?

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

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

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

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

Pressing key ONCE,...

Sean

Dynamat costs too much. I used one 4X8' sheet of this stuff for the entire roof: http://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: http://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.

Oops, left this out. I've also insulated the doors and side panels with a double layer of this underlayment product: http://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.