Impious

Why can't a ported enclosure be used in an "SQ" setup?

Certainly you can. You would however need to externally bandpass the signal, as you can not bandpass all 6 channels at those frequencies with the on-board crossovers. Only channels 3&4 have the appropriate crossovers for your needs.

Imagine that....they are from AQ, I wouldn't expect any different. Which is sort of funny because their webpage says "TS measurements taken after one hour break-in from BNIB random samples"....and then they don't actually list any T/S parameters.....? I'd be a little wary of a 4khz lowpass crossover on a 6.5" mid in a system designed to be used in an automobile. I can only imagine the hole in the FR that develops when these things are mounted off-axis, even if the driver itself happens to be well behaved up to 4khz (which is usually pushing it for a 6.5" driver)........

Not sure I'd base any part of my decision on the opinion of someone who, first, demonstratively doesn't really understand much about acoustics based on the installation and second, bases their decision of "good sound" on how far they can walk away from the vehicle and still hear the sound.

A lack of parallel walls will have zero affect in the subbass. The purpose of non-parallel enclosure walls is to reduce standing waves within the enclosure. For subbass, this isn't going to be an issue to begin with as the dimensions of the enclosure are much shorter than the wavelengths of the sound waves, so standing waves are not going to develop. For subbass, I doubt there would be an audible difference between a well designed and braced MDF enclosure and some other exotic enclosure material. The resonant frequency of the panels is gong to be too high, and any losses from panel resonance/flexing is going to be too small compared to the driver output to audibly affect the sound. On a meter, I doubt you would see much of a difference either as long as the MDF enclosure was properly braced to begin with. Notice I explicitly stated I discussing affects in the subbass frequency range here. As we move up the frequency spectrum where the wavelengths are shorter and you are closer to the Fs of the enclosure panels, those issues can start to become problems (although there are far less exotic means of dealing with them). External panel shape can also affect frequency response in other ways in the higher frequency region....but that's neither here nor there.

I believe he was spamming to get to 25 posts, so he could post a WTB in the classifieds.

Was getting ready to say the exact same thing. You want bracing to reduce panel flexing, not CLD.

The question first needs to be: How often do you sit at idle playing the stereo at full out balls to the wall, and what are your goals for the system?

Agreed. Definitely not worth $400 to try to get another 1V back at idle.

Stupid question: If his alts are done and have been forever, and you're just waiting to complete the brackets......why not ship the guy his alts (more than likely the most costly part of this transaction), and DC Power contract and pay for someone like tejcurrent, another manufacturer right here on this forum, to build the brackets? It seems like this would go a long way towards completing the transaction on a pretty timely basis. At the very least, this would put the biggest chunk of change back into the OP's hands by having a tangible product in his possession. Then the only thing left is the bracket, which if another manufacturer such as tejcurrent can't produce on a timely basis, it's less of a refund that would need to be made by DC. And the OP can be on his merry way finding someone who can build a bracket for him. With all of the machine shops in the US, and another manufacturer right here on this forum whose explicit business is building alt brackets, I can't believe this isn't something that could have been completed at least since the start of this thread.....much less nearly 2 years.

At what THD? That's pretty relevant information.

It doesn't matter what sub you are using. You aren't going to hear a difference between 1500w and 2kw. If this setup isn't for SPL competitions and is designed primary for daily listening, then don't worry about the extra 500w regardless of subwoofer. If you plan on actually competing in a serious manor then yes, the larger amp would be a better investment. But otherwise, it's unnecessary.

We need to fix that. I love free samples. especially when you go to the grocery store and they have some awesome pizza or maybe some kind of meat product. Just saying My employee's New Year's resolution is to quit smoking, so she was excited when she went to Walmart today on lunch and they were giving out free samples of Nicorette patches and gum as they are ridiculously expensive products. She was telling me about it as she was looking at the pamphlets when she noticed the small print "Samples do not contain any nicotine". She was pissed. It was funny.

It depends on what type of enclosure you are looking to use. The W7 is a little better suited to sealed enclosures than the Xcon, the Xcon is a little more suited to ported enclosures than the W7.

Welcome back. Long time no see.

You'll end up more pissed when you spend a bunch of money on a high powered amp and sub and end up blowing something up because you couldn't actually support the system, or when you don't get anywhere near full potential out of them because you couldn't properly support the system. IMO you're in over your head. If you weren't even aware of what the "big 3" were, you'll do way more damage than good with a high powered system. You can't toss a 2kw+ amplifier on a stock electrical system and expect to get anywhere near full performance, in addition to running the risk of damaging equipment. What is your budget for everything.....amplifier, electrical system upgrades, etc? What can you replace/add/upgrade as far as the electrical system is concerned? What does your electrical system consist of now?

I'd say 3-way active is probably not a good choice for someone inexperienced. Midbass...going to be hard to achieve your goal. If you were able to get a pair of AA Carbons to full excursion at 80hz, for example, you'd be limited to about 107db based on their displacement (excluding affects of the vehicle's acoustics). If you have access to a termlab, grab an 80hz test tone and play it thru your subs, and set the volume so you have 107db of output and see what you think. Enough? Yes? No? That would be the maximum output you could get from the pair, unless your vehicle happened to have a significant boost in the midbass frequencies. If you want more output you could run larger diameter mids, downfall is that you won't be able to play them as high. You might get lucky and find a large format tweeter that can play fairly low and deal with some potential beaming effects and maybe some worsened distortion or FR issues at the upper end of their range depending on the driver and what xover point you can get away with. Or you could run a pair of 7" mids. If you used them in a vertical array, used proper spacing and aiming and kept the xover point reasonable, might not be too bad and you'd gain another 6db in output compared to a single pair (assuming you also doubled the amplifier power compared to a single pair). Really, it might even help a little by limiting vertical dispersion which can help reduce reflections from the dash/roof/floor through the some of the mid's frequency range (same reason home audio speakers use this arrangement). It would take a little bit of knowledge to get it right....but if used right, could be advantageous. If you really wanted to get a little nutty, you could even try to run them ported.

Don't see why it would be a problem......it will work perfectly fine on any amp rated stable down to 2ohm. And really, the DCR isn't that odd-ball. DCR on a 12W7 is 2.47ohm. Compare that to a Fi, who's "dual 2ohm" subwoofers have a DCR of 1.4ohm/coil which when wired in series for a "nominal 4ohm load" would be a DCR of 2.8ohm. So the DCR of the "3ohm" W7 is .33ohm lower than the DCR of Fi's drivers wired to "4ohm".

Really, you couldn't be more wrong. The W7 was basically the first low distortion, high linearity, high output driver in the market. The entire purpose of it's design was to improve BL linearity and reduce distortion while also improving output capabilities by increasing cone area and maintaining a high Xmax (which aside from shear output, the benefits of high displacement capabilities are also a benefit from a "sound quality" perspective as well). Really, it's pretty telling that the design is nearly a decade old now and it's still in the top tier of high performance offerings on the market. You might say "Nonsense! I've heard the subs in my brother's Dakota and it didn't sound good at all!".....and that very well might be the case. But that's not a fault of the driver. Chances are, it was probably a fault of the installation, enclosure, tuning and/or setup and settings. Which makes your listening experience rather meaningless as a point of comparison. Of course it's possible (but unlikely) that the setup, installation and tuning was perfect in your brothers setup. It's also possible (and more likely), that you simply don't enjoy the sound of a lower distortion, linear driver. Your subjective definition of "good sound" might simply be different than what the W7 offers. But that's a difference in subjective preference, not a difference or deficit in "sound quality". But again, since this is based completely on subjective opinion, it's rather meaningless as a point of comparison. I would find it hard to believe someone could spend the time, thought and expense to design a driver like the W7 with all of it's unique and innovative features without being in love with audio. It pushed the envelope of performance and innovation a decade ago, and is still holding it's own a decade later. Also, keep in mind JL Audio got it's start as a mail order speaker business. They were essentially the equivalent of today's "underground" (internet) brands. They just happened to do it extremely well and as a result have grown and experienced a lot of success over time. That really doesn't make any sense. Every business is trying to grow ? I would say JL took that idea to a new level when they designed and released the W7.

Proof required, on both claims. And I can link you to some reviews of cheap Sony amps showing that even they produce rated power output.....so I'm not so sure your "very few brands put out rated power" is even remotely accurate to start with. x2, I'm pretty sick and tired of people thinking mainstream products are bad and "underground" "competition" brands are the only way to go... <------ Waiting for someone to post that link to Jacob's comparative amplifier test. I'm so sick of having to explain that link..... This link ? Yes, that link.

Specifically stated on Soundstream's SPLX webpage: • Re-Cone Kits Availble (Contact Parts Office) As for the subs themselves.....T/S parameter wise they are darn near identical. Fs and Vas are nearly spot on between the two. The SPLX has slightly higher Qes/Qts although close enough that simple production variances could make them nearly identical. The Fi has slightly higher rated Xmax, but the SPLX has slightly more rated Sd (though I'm not sure if the rating methods for these two parameters are identical, although physically speaking the SPL appears to use a slightly smaller surround which would contribute to slightly more Sd)......so overall, the rated Vd of the drivers are within 1db of each other. Quickly modeling them both in WinISD, in identical enclosures with identical power, their response is nearly identical. Close enough to call them equal. Both use 3' VC's, with the added options on the Fi it may have a slight power handling advantage. I don't know enough about either sub to really speak towards design or quality. But from a simple gaze at the T/S, I'd call it a toss up.

Proof required, on both claims. And I can link you to some reviews of cheap Sony amps showing that even they produce rated power output.....so I'm not so sure your "very few brands put out rated power" is even remotely accurate to start with. x2, I'm pretty sick and tired of people thinking mainstream products are bad and "underground" "competition" brands are the only way to go... <------ Waiting for someone to post that link to Jacob's comparative amplifier test. I'm so sick of having to explain that link.....

Just exchanging amplifiers and claiming to note a difference, doesn't mean you can attribute that difference to one specific variable You'd need to conduct the proper tests under controlled conditions the proper amount of times to verify results. Unless you've done that, results are invalid. Amplifiers are pretty well understood. Our hearing mechanisms are pretty well understood. I've never seen a properly conducted test that validates the audibility of amplifier classes.

Either those amps suck, or it was something else he changed at the same time. Like not properly readjusting the gain, or atleast not adjusting it to a similar setting..... They were properly adjusted, and amps are amazing. Sounds like he readjusted the gains to a different relative setting than they were at before.