dlr said:
Think of higher than F tune. The PR system keeps on following the main driver well into mid bass and low mid. There resides the feeling of pace.
salas said:
The reflex system, whether PR or port, is a bandpass, so both are second order for their lowpass and both have output above tuning. It's not limited to the PR. In this aspect the port and PR are identical.
Ports tend to have more spurious output and odd behavior above tuning due to more odd interactions that are at times related to the port interior location. PRs mostly avoid this due to their location being nearly fully adjacent to a box surface and because they have a much larger surface area.
Dave
Exactly. They do follow the main driver widely enough. The higher the frequency and the more the PR mass vs air in a port, the less easier is to follow in exact lock inertia wise. See, you distribute PR tuning mass circumferentially. Hints that there must be playing a role. My experience suggests that PR is great in sub woofer territory. The higher you go the more it reveals its presence time wise. All other benefits vs non linear porting are true and its a matter of cooking the right ingredients in a speaker system. Then again I may be too cautious of such matters or imagining things and causes, and the root is elsewhere in the system. But people keep on saying that PR sounds slow for decades now. Popular myth maybe.
Given the opportunity I must say that I avoid the deeper tunings vs sensitivity gain for normal, rather small, city style apartments. Going from 35Hz to 25Hz merely excites rumble and it dictates less efficient driver choices. A 3-5dB more sensitive speaker that goes down to 40Hz in a normal living room is more musically satisfying in the long term IMO. A closed box can be used for such a plan, with superior group delay against any aiding resonance choice too.
Given the opportunity I must say that I avoid the deeper tunings vs sensitivity gain for normal, rather small, city style apartments. Going from 35Hz to 25Hz merely excites rumble and it dictates less efficient driver choices. A 3-5dB more sensitive speaker that goes down to 40Hz in a normal living room is more musically satisfying in the long term IMO. A closed box can be used for such a plan, with superior group delay against any aiding resonance choice too.
salas said:
Well, no. There is no difference between a port and PR in this respect. The phase delta is the same for both.
[/UOTE]See, you distribute PR tuning mass circumferentially. Hints that there must be playing a role. My experience suggests that PR is great in sub woofer territory. The higher you go the more it reveals its presence time wise.[/QUOTE]
I wouldn't say "must". I do it because it "may" be an issue. I'm not convinced in any way that it is actually an issue.
PRs are no "slower" than ports. It's a myth with origination in poorly designed reflex systems if it's in comparison to ports. Closed boxes with good extension are superior, though.
I can't disagree with any of this.
Dave
Percy,
You could go ahead and buy those "errible" speakers, then spend another $30 on some kit, take a slightly off angle pic of each driver, post it over on the EnABL thread, I will provide pattern positions for you ala' photo shop and you can turn the "terrible" speakers into something quite good. This is actually something you can DIY and it will be more than worth your time.
For the thread, come to the end and post the pics, we will help with the rest.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=100399
Here are some application pictures so you can see what all of those words are going on about.
http://picasaweb.google.com/home?tab=mq
Bud
You could go ahead and buy those "errible" speakers, then spend another $30 on some kit, take a slightly off angle pic of each driver, post it over on the EnABL thread, I will provide pattern positions for you ala' photo shop and you can turn the "terrible" speakers into something quite good. This is actually something you can DIY and it will be more than worth your time.
For the thread, come to the end and post the pics, we will help with the rest.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=100399
Here are some application pictures so you can see what all of those words are going on about.
http://picasaweb.google.com/home?tab=mq
Bud
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