Is that true?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=63310
Printed Date: May 14, 2025 at 7:38 PM

Topic: Is that true?

Posted By: Aruman
Subject: Is that true?
Date Posted: September 26, 2005 at 3:28 PM

Hi Guys, I'am Wondering, if you have 2 SubWoofer of the same type, thus same RMS power and size, but one is single voice coil and the other is dual voice coil, is that true that the one that is Dual Voice Coil Will be louder? the single voice coil have a SPL 2.83v/1m of 85.9 dB and the Dual Voice Coil have SPL 2.83V/1m of 87.48, Will the Dual voice coil be louder? because it's more efficient. or that doesn't matter?, thnx guys

Replies:

Posted By: tcss
Date Posted: September 26, 2005 at 3:36 PM

Only way the dual will be louder is if the dual is a lower impedance then the single and your amp puts out more power at the lower ohm rating.

Posted By: DYohn
Date Posted: September 26, 2005 at 5:06 PM

Exactly. As tcss indicates, if the DVC woofer was tested with the VCs in parallel, it presents a lower impedance to the amplifier and produces more SPL. Look at your ratings. The manufacturer has used the non-standard rating method of 2.83 volts/meter. 2.83 volts is one watt into an 8-ohm load, but 2 watts into 4 ohms and 4 watts into 2 ohms. This is a tricky way of making you think the DVC is more efficient. It isn't, it's just a lower impedance. Sensitivity ratings should be given with 1 watt/meter not 2.83 v/meter to be comparable from one speaker to another.

-------------
Support the12volt.com