Aperion Audio Verus II Grand Tower Speaker vs SVS Ultra Towers (and others)

Discussion in 'Speakers' started by BadJRT, Dec 30, 2018.

  1. JStewart

    JStewart Active Member
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    I've also had the pleasure of sharing a couple of different email conversations with Jon. He is beyond helpful.
    My hope is one of the 1st sets available for review will be heading to AV NIRVANA.
     
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  2. Kerry Armes

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    Hi Brian,

    I'm one of the owners of CSS. I found this thread from a backlink to our site (linked to my article about passive radiators) when looking at our analytics data so I stopped in to see what was being discussed. I saw this post (and a few others) and wanted to clarify a few things.


    The information being provided by Steve Fienstein is not completely accurate and he seems to be confused on a few points and jumbling multiple things together. An acoustic suspension and sealed design are not the same thing, although they are often referred to as such. Acoustic suspension had specific requirements for woofers with very low fs and very lossy suspension as key components and used the air spring in the box to provide restoring force for the woofer rather than its motor and suspension. You can look up the patents related to it to get more info. So he’s right that you can’t make any ported speaker an acoustic suspension speaker. However, you can definitely turn any ported design into a sealed design by stuffing the port. How well it performs will depend on what you were expecting. The ported cabinet volume is likely a larger internal volume than I would use if I designed the speaker sealed in the first place, but it will still perform very similar to stuffing the port.


    Steve seems to think these foam plugs are for marketing purposes only, so companies can say they are selling you a true sealed speaker or a true ported speaker in the same box and hit both crowds. What these plugs really do is restrict airflow out of the port and thereby reduce port output. It really ends up being somewhere in between a ported and sealed design.


    But the real question is why would you want to do this, or why would companies include it. Well, the biggest reason is that not everyone has the same room and can’t place their speakers ideal distances from boundaries that reinforce bass or eliminate room modes in their system. If your speakers sound boomy in the lower bass, these port plugs reduce output and therefore will reduce boominess. It doesn’t mean that the ported design is flawed (although it could be). It just means that you are getting higher output than desired around port tuning. This is an easy way to let people adjust without any real consequences like buying new speakers or permanently modifying the ones you have.


    Ported speakers tend to have more issues with boominess because room placement and because they extend deeper and might excite more room modes. Most normal rooms have a natural rise below a certain frequency (room size dependent) and so if your ported speaker extends to 40 Hz flat and your room starts its rise at 60 Hz, you could be +6 dB at 40 Hz in room. Now if you have a strong 40 Hz room mode, you might be even higher, which will also affect 80 Hz and 160 Hz. But if you have a speaker that is sealed with an f3 of 60 Hz, you would be flat at 40 Hz and the room modes would be less exaggerated.


    Slight detour: One of the other posts here was discussing the benefits of front porting versus rear porting and asking about port placement close to a wall. Any speaker placed close to a wall that includes full baffle step will likely be boomy. It really won’t matter if it is front ported or rear ported. Close position to boundaries will reinforce bass frequencies and cause all sorts of bad interactions in the mid-bass and lower midrange. However, getting a port too close to the wall could restrict airflow and prevent you from getting full output from the port. It could also potentially lower your actual port tuning frequency. Ports also have resonant frequencies above the tuning frequency and many argue that having a front port might make these more audible. While the resonances are real and measurable, I’ve never seen any direct evidence from research to show that front porting makes them more audible than rear porting.
     
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  3. Kerry Armes

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    I'm glad you liked the article. We've got a bunch of other good ones on the website. I try to write all mine in a language that is easy to read and understand so hopefully someone at a beginner level can at least take away the main points. If you have other topics you'd like to see, drop us a line.
     
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  4. BadJRT

    BadJRT Member
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    Hello Kerry,
    Thank you so much for elaborating on some of my inquires. I'd like to ask a few more questions but I don't have time to write them out right now.(Hopefully this weekend) I just wanted to let you know I read your posts here and really appreciate you taking the time to explain some of these things to a guy who's not very knowledgeable, but trying to learn all I can before I start building my system.

    Thanks again, Brian
     
  5. Kerry Armes

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    No problem
     

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