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High-end SQ/IB setup questions.
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<blockquote data-quote="helotaxi" data-source="post: 2581983" data-attributes="member: 550915"><p>I would place about zero stock in spec THD numbers. Outside of independant testing, thee is no way to confirm their veracity. I have no doubt that the JL and DLS amps will blow their specs away, but my real point is don't get too wrapped up in manufacturers specs. There is no standard and as such any numbers can't be compared between companies.</p><p></p><p>As far as THD being cumulative, that is true, however, 5 components in a signal chain is a lot, a whole lot actually. HU, processor, amp is about all I would expect. Next thing is that 1% is considered the ragged edge of audibility for a trained ear. Any components worth having will keep the level well below that threshold. Signal to noise likewise. Throw in that most speakers are going to introduce as much as 10% distortion and you can see that solid electronics are important but not as important as the speakers themselves when it come to reproducing the sound accurately since the speakers will make most of the distortion.</p><p></p><p>At the power level that you're looking at, don't be concerned with people who say that the JL amps are current hogs. Compared to the most efficient Class D amps out there, they may be a little greedy, but I'd much rather deal with the current consumption of a 500/1 than one of my old Class A/B amps putting out the same power. The rated draw of the Class A/B is higher than the fuse rating of the JL.</p><p></p><p>Lastly, when it comes to power handling in an IB setup, thermal power handling (what a spec indicates) is pretty much never the limiting factor. Mechanical power handling is what will limit the power you can safely send to the driver. In a true IB setup the woofer is pretty much on its own when it comes to controlling its cone movement. Unlike with a conventional ported or sealed enclosure, there is no air spring helping to dampen cone movement (it also won't color the sound which is why IB setups are so well liked for SQ installs). As such it takes a lot less power to get the sub to move to its suspension limit. If the sub has a lot of suspension overhang compared to the distance that the motor can actually move it (a lot of the high output subs fall into this category) you really don't have to worry, but that isn't always the case. If the motor is capable of driving the sub to its suspension limit it will happen with the least amount of power in an IB setup.</p><p></p><p>I don't have experience with the drivers that you've mentioned. The sub is really only going to be responsible for less than 2 octaves of the audible spectrum, so stressing over it isn't that necessary. You can obviously spend a fortune on a substage, but it isn't usually necessary in an SQ setup. The Image Dynamics IDQ as mentioned is a great IB driver and very budget friendly as well, which frees up more money for what really matters, the front stage components...</p><p></p><p>If you have any other questions, don't hesitate to ask.</p></blockquote><p></p>
[QUOTE="helotaxi, post: 2581983, member: 550915"] I would place about zero stock in spec THD numbers. Outside of independant testing, thee is no way to confirm their veracity. I have no doubt that the JL and DLS amps will blow their specs away, but my real point is don't get too wrapped up in manufacturers specs. There is no standard and as such any numbers can't be compared between companies. As far as THD being cumulative, that is true, however, 5 components in a signal chain is a lot, a whole lot actually. HU, processor, amp is about all I would expect. Next thing is that 1% is considered the ragged edge of audibility for a trained ear. Any components worth having will keep the level well below that threshold. Signal to noise likewise. Throw in that most speakers are going to introduce as much as 10% distortion and you can see that solid electronics are important but not as important as the speakers themselves when it come to reproducing the sound accurately since the speakers will make most of the distortion. At the power level that you're looking at, don't be concerned with people who say that the JL amps are current hogs. Compared to the most efficient Class D amps out there, they may be a little greedy, but I'd much rather deal with the current consumption of a 500/1 than one of my old Class A/B amps putting out the same power. The rated draw of the Class A/B is higher than the fuse rating of the JL. Lastly, when it comes to power handling in an IB setup, thermal power handling (what a spec indicates) is pretty much never the limiting factor. Mechanical power handling is what will limit the power you can safely send to the driver. In a true IB setup the woofer is pretty much on its own when it comes to controlling its cone movement. Unlike with a conventional ported or sealed enclosure, there is no air spring helping to dampen cone movement (it also won't color the sound which is why IB setups are so well liked for SQ installs). As such it takes a lot less power to get the sub to move to its suspension limit. If the sub has a lot of suspension overhang compared to the distance that the motor can actually move it (a lot of the high output subs fall into this category) you really don't have to worry, but that isn't always the case. If the motor is capable of driving the sub to its suspension limit it will happen with the least amount of power in an IB setup. I don't have experience with the drivers that you've mentioned. The sub is really only going to be responsible for less than 2 octaves of the audible spectrum, so stressing over it isn't that necessary. You can obviously spend a fortune on a substage, but it isn't usually necessary in an SQ setup. The Image Dynamics IDQ as mentioned is a great IB driver and very budget friendly as well, which frees up more money for what really matters, the front stage components... If you have any other questions, don't hesitate to ask. [/QUOTE]
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