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<blockquote data-quote="ciaonzo" data-source="post: 8071143" data-attributes="member: 607015">Well, SQL is a misnomer like that other popular one, substage. I hate both of those &#039;words&#039; and I refuse to acknowledge them, but I&#039;m lovin&#039; that little DD full range amplifier. I&#039;d like to try one of those at some point.It&#039;s important to think of vented enclosures and PR enclosures as practically synonymous, but certainly interchangeable. You can achieve identical frequency response plots with both in the pass band, the only exception is the 28dB rolloff with PR compared to 24dB with vented. Other than that, they do exactly the same thing. Each has it&#039;s own advantages. PR is a little touchier and a horrid transient response is guaranteed if done wrong. Vented is much more forgiving if tuning is off target.To say that you can&#039;t have a sound quality setup with a vent is incorrect, you can. You just need to preserve certain things like frequency extension and low group delay within the important thresholds. Another point of interest is the response from 20-80hz. Even if I have an absolutely perfect frequency response profile from 5 to 500hz as measured in an anechoic space, the second I introduce it into the vehicle&#039;s interior, that is out the window. The vehicle&#039;s acoustics will dominate no matter what. This is why it is ABSOLUTELY essential to have equalization capabilities.I&#039;m at work so gotta go for now.</blockquote>

[QUOTE="ciaonzo, post: 8071143, member: 607015"] Well, SQL is a misnomer like that other popular one, substage. I hate both of those 'words' and I refuse to acknowledge them, but I'm lovin' that little DD full range amplifier. I'd like to try one of those at some point. It's important to think of vented enclosures and PR enclosures as practically synonymous, but certainly interchangeable. You can achieve identical frequency response plots with both in the pass band, the only exception is the 28dB rolloff with PR compared to 24dB with vented. Other than that, they do exactly the same thing. Each has it's own advantages. PR is a little touchier and a horrid transient response is guaranteed if done wrong. Vented is much more forgiving if tuning is off target. To say that you can't have a sound quality setup with a vent is incorrect, you can. You just need to preserve certain things like frequency extension and low group delay within the important thresholds. Another point of interest is the response from 20-80hz. Even if I have an absolutely perfect frequency response profile from 5 to 500hz as measured in an anechoic space, the second I introduce it into the vehicle's interior, that is out the window. The vehicle's acoustics will dominate no matter what. This is why it is ABSOLUTELY essential to have equalization capabilities. I'm at work so gotta go for now. [/QUOTE]

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