Best place for small amount of Dynamat?

[Gabber-Baby]

I haven't installed my sound system yet because I am still waiting on some fabric to be delivered.

I have :-

2x 12" Pioneer Subs, 400w RMS
JBL power amp with a power cap (approx 750w RMS depending on what omhage i use)
Sony Xplod Head Unit
2 x Sony Xplod 6x9's



It's really only a basic budget setup but has still got quite a bit of power, the boyfriend got most of it for me and is also installing it soon. I have got 10 feet of Dynamat which i know is no where near enough for a proper boot build so i have to use it sparingly because it's so damn expensive. I just want to know if there are any typical places in a mk3 golf that are prone to rattling? I suppose it will be the same on any 10 year old car? Could be wrong. I was going to fit most of the dynamat in the boot itself, and behind the number plates so they don't vibrate.

Any better suggestions?

[Len]

Wouldnt waste it behind the number plate, get some good mastic for that.

Personally I would always start with the doors and the rear panel as yours is a 3 door.

[Heyho]

Usually it would be ideal in the front doors...but as you are concentrating your efforts in the boot, use it on the largest expanses of metal/panels in that area.

It's not really used to stop rattles, but to reduce and eliminate panel resonance by adding mass. 

Alternatively sell the powercap and 6x9s, deaden the front doors and put some nice components in there.

[Uruk Hai]

If you dont want to blow shed loads on dynaprat then you could try this :-

 http://www.wickes.co.uk/invt/243009

does the same job IMO 

[Chris 'N' Jen]

You may want to consider sending the power cap back as they are just a gimmic. They discharge in less than a second, after that they are just extra load on the system untill they recharge.

 

[BaxGTI]

Well, capacitor charge/discharge time (in seconds) is 5CR (5 x capacitance x resistance). So, as we can see from the box that the cap is 1.6 farads, the load would need to be 0.125 Ohms for it to discharge in 1 second... So I highly doubt this is so.

My sub has an impedance of 4Ohms according to the documentation, meaning for me with that capacitor the discharge time would be 32 secs (negating any other impedances)...

Or am I way off mark here?

[Chris 'N' Jen]

do a search on www.talkaudio.co.uk on power caps. they can explain things better than i can.

[Heyho]

Or more specifically: http://www.talkaudio.co.uk/vbb/showthread.php?t=20973

As for the sound deadening/flashing tape debate - you get what you pay for.  As sound deadening is pretty much just adding mass to panels in order to lower the resonant frequency of that panel, the best way to gauge the value for money is to compare weight for weight.

Look on ebay for sound deadening, and you'll come across edead - bitumen/butyl based deadening mat which looks to be jolly good value when compared with Dynamat or similar branded mat, but look closely and you'll see that although it's half the price of the "proper" deadening, it's also half the thickness, therefore half the weight.

There's nothing wrong with using flashing tape, but you'll find that you need to apply more layers to obtain the same effect as maybe one layer of a branded audio specific product. 

Dynamat also seems to trade on it's name, but there are other products out there that seem to get good press, and are better value.

http://www.caraudiodirect.co.uk/second-skin-damplifier-bulk-p-5503.html

[Ashmond]

Wouldnt waste it behind the number plate, get some good mastic for that.

Where do you put the mastic? Because in my mk4 what rattles is the wiring for the lights and the plate

[Len]

No idea what you're on about mate! I only said the plate which has nowt to do with wiring! And for that plonk a load of gunk between the plastic number plate and the cars metalwork! Then srcew it up!
Not rocket science!