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<blockquote data-quote="Brian jojade" data-source="post: 58840" data-attributes="member: 211">Re: Subwoofer comparison SRX728 vs Vertec 4883If you make speaker buying decision based on marketing spec sheets alone, you might as well go ask a donkey which one they like better.&nbsp; That wonderful &#039;calculated max spl&#039; is the most meaningless spec ever.&nbsp; It&#039;s assuming 100% efficiency of the driver at full power.&nbsp; Yeah, right.&nbsp; And a frequency graph at 1 watt is one thing.&nbsp; What&#039;s the frequency graph at show power?&nbsp; Why don&#039;t speaker manufacturers post that material?&nbsp; That&#039;s where the differences in cabinets will really start to show up.&nbsp; And when the graphs at low power are way different than at high power is when the speaker is impossible to EQ for.As far as what you&#039;re giving up with the dual 12&#039;s vs dual 18&#039;s it all comes down to physics.&nbsp; Both boxes are great boxes, but the 728 can go lower. 7hz may not sound like a lot, but in reality, the difference can really add up for you. -3db at 40hz means the rolloff starts above 40hz, where it really does matter.</blockquote>

[QUOTE="Brian jojade, post: 58840, member: 211"] Re: Subwoofer comparison SRX728 vs Vertec 4883 If you make speaker buying decision based on marketing spec sheets alone, you might as well go ask a donkey which one they like better. That wonderful 'calculated max spl' is the most meaningless spec ever. It's assuming 100% efficiency of the driver at full power. Yeah, right. And a frequency graph at 1 watt is one thing. What's the frequency graph at show power? Why don't speaker manufacturers post that material? That's where the differences in cabinets will really start to show up. And when the graphs at low power are way different than at high power is when the speaker is impossible to EQ for. As far as what you're giving up with the dual 12's vs dual 18's it all comes down to physics. Both boxes are great boxes, but the 728 can go lower. 7hz may not sound like a lot, but in reality, the difference can really add up for you. -3db at 40hz means the rolloff starts above 40hz, where it really does matter. [/QUOTE]

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