PDA

View Full Version : New Cadence ZXC6KS rattling



alex6999
04-22-2010, 08:32 PM
bought from audiosavings
here NEW CADENCE 6.5" 300 WATT SLIM CAR COMPONENT SPEAKERS : eBay Motors (item 390162618910 end time Apr-15-10 23:07:21 PDT) (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=390162618910&viewitem=&sspagename=STRK%3AMEWNX%3AIT)

mclerico83 recommend it.

when i increase volume - it start rattling.
it not loud when start rattling

i checked both speakers, one installed and one connect in hand.

1. it was connected through cadence crossover.
HU crossower was setup to 63 Hz -12db

2. it was connected direct.
it rattling at low frequencies
100 Hz at -18 db still rattling
100 Hz at -24 db not rattling

WHY? is it normal?
what if i don have crossover in HU? i need to turn knob of amp to 200 Hz to prevent rattling, i suppose amp xover -12db

thanks

PS:
HU Alpine CDA9833
Amp Power Acoustik GOTHIC OV2-1250
1250 peak, 220 RMS per channel
Bridged RMS Power: 560 watts
i think real RMS 12V * 50A * 50% AB Amp Efficiency = 300 total bridged.
so i think i can do 115W RMS per channel. its enough for 75 rms speaker. without THD

PPS: cheap $30 coaxs with cool lights from walmart plays better.