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Sealed Subs cannot match the output of ported designs. That said, the out put of even the 21 inch bagend sub looks pathetic in papers.
For a sub for its musical value, we can know that only when we audition it. May be they are designed to be a very fast sub with beautiful transients and compromised heavily on sound output.
Do you mean to say that the Velodynes reference sub The DD18+ (sealed sub) has lesser output than lets say Velodyne EQ max 15(ported sub)????
In the link I provided, you can clearly see that people who had the bagend sub say that this sub distorts a lot below 40hz and this sub also clips for modest volume. Would you still prefer to call this distorter musical?
IF a old SVS PB12Ultra can outperform a bagend 18infrasub both in quantity and quality, then the subs that I have mentioned are miles ahead(in another league) of even the new SVS PB13Ultra. so they can walk all over the bagend sub effortlessly.
Can you show me a bagend ported sub that can outperform the JTR Captivator S2 sealed sub? no way.
Seaton submersive HP is one sub which has the cleanest out put.The owner of the company Mark Seaton never advertised on any magazine, but still people all over the world love this sub. This sub has won almost all the blind audition test in all the gtg's,for its sheer power and Quality(speed, depth, punch) This sub can easily go louder than even the PB13Ultra ported sub by great margin, except around the tuning frequency of the PB13, which is 20hz. and JTR S2 can outperform even a pair of bagend 21" ported sub
Port will give advantage around its tuning frequency, but that isn't all. For a good subwoofer, you need a good capable driver, a strong high power amp with clean current, proper tuning of the amp, a properly designed box and proper implementation of all these.
Moreover, the list of subwoofers that I have mentioned as best subs contains sealed, ported and hornloaded subs.
In the link that I gave, you could have clearly seen that people who had the bagend subs say that this sub distorts a lot below 40hz. Thats pathetic for a reference quality sub.
Bagend subs aren't that expensive, but still, why do you think few people buy them?? The are more like PA subs (not PA subs because PA subs can play loud above 30hz)
Why do you think SVS, JTR, SEATON, PSA, RA and Funk are appreciated by people allover the internet.
Most of the subs that I have mentioned have never appeared in any magazine, but still they are loved by people, because these subs perform that good.
This is the driver used in a bagend infrasub18: