Menu
Forum
General Car Audio
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Build Logs
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Home Audio
Off-topic Discussion
The Lounge
What's new
Search forums
Gallery
New media
New comments
Search media
Members
Registered members
Current visitors
Classifieds Member Feedback
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Log in / Register
Forum
Search
Search titles and first posts only
Search titles only
Search titles and first posts only
Search titles only
Log in / Join
What’s new
Search
Search titles and first posts only
Search titles only
Search titles and first posts only
Search titles only
General Car Audio
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Build Logs
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Home Audio
Off-topic Discussion
The Lounge
What's new
Search forums
Menu
Reply to thread
Forum
Car Audio Help
Enclosure Design & Construction
Help with first ported box
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="Moble Enclosurs" data-source="post: 7618353" data-attributes="member: 634917"><p>Parameter Single Coil Parallel Series</p><p></p><p>Re: 1.9 Ohm 0.95 Ohm 3.8 Ohm</p><p></p><p>Le: 0.475mH 0.238mH .95mH</p><p></p><p>Fs: 21.3Hz 21.3Hz 21.3Hz</p><p></p><p>Qms: 3.09 3.09 3.09</p><p></p><p>Qes: .9 .45 .45</p><p></p><p>Qts: .7 .39 .39</p><p></p><p>Mms: 206g 206g 206g</p><p></p><p>Cms: 0.27 mm/N 0.27mm/N 0.27mm/N</p><p></p><p>Sd: 506 cm^2 506 cm^2 506 cm^2</p><p></p><p>Vas: 97L 97L 97L</p><p></p><p>BL: 7.65 7.65 15.3</p><p></p><p>X-Max: 30% down point on BL Curve 26mm 26mm 26mm</p><p></p><p>Pmax: (Read our notes on power</p><p></p><p>handling)</p><p></p><p>1000W 1000W 1000W</p><p></p><p>SPL: 85.1 dB 1W/1M (in series)</p><p></p><p>Volume Occupied by Driver .13 cubic feet</p><p></p><p>This is the x2. If these are incorrect from what you are using, then I understand the confusion. otherwise if they are correct.read on...........</p><p></p><p>quote: " <strong>it just seems some of your measurements go against the sub designer's</strong>" And hence the reason why no one on here will find another designer like myself. If you want to be stereotypical, that's fine. Take it from someone who is an acoustical engineer and with military sound experience as well as college training in electronics. Take my advice or not. Either way, I can say I still attempted.</p><p></p><p>I think others on this forum can easily vouch for my degree of acoustic knowledge.</p><p></p><p>I do not mind if you do not use the help, that is at your discretion. So, I am not upset if you do or not.</p><p></p><p>And yes, my requirements do go against the designer of the subwoofer for a very good and logical reason. Because they do not take into a lot of factors that I figure for. They base their responses on an anehcoic .707Q response curve, which I can guarantee will not look the same when loaded. Nor will it act the same. They do not take into consideration driver limitations by purposely limiting them so they can guarantee that their specs will not damage the drivers. but they do not calcualte for the given leeway of efficiency that they are fully capable of. The designer/manufacturer of the drivers give them a safe zone, not realizing that with proper application parameters, the safe zone is too much of a limit. They worry too much about excursion not taking into consideration the full capabilities and differences between linear and non linear response.</p><p></p><p>Trust me. I know what I am doing.</p><p></p><p>I am not in a quarrel about your comment, but I do hope to begin to realize that manufacturer specifications are far from ideal in most cases of audio because they want to make sure that if you design a box they recommend, that you get a stereotypical response and that you do not have to return a damaged item that falls within their return policy, by either overpowering them, or by defect of the design or driver.</p><p></p><p>So, they make sure that the driver has compression limitations, as well as tuning and control limits over what they are really capable of and pay no attention to efficiency and loading effects of even some more non conventional styles.</p><p></p><p>Is that helpful to your concern?</p></blockquote><p></p>
[QUOTE="Moble Enclosurs, post: 7618353, member: 634917"] Parameter Single Coil Parallel Series Re: 1.9 Ohm 0.95 Ohm 3.8 Ohm Le: 0.475mH 0.238mH .95mH Fs: 21.3Hz 21.3Hz 21.3Hz Qms: 3.09 3.09 3.09 Qes: .9 .45 .45 Qts: .7 .39 .39 Mms: 206g 206g 206g Cms: 0.27 mm/N 0.27mm/N 0.27mm/N Sd: 506 cm^2 506 cm^2 506 cm^2 Vas: 97L 97L 97L BL: 7.65 7.65 15.3 X-Max: 30% down point on BL Curve 26mm 26mm 26mm Pmax: (Read our notes on power handling) 1000W 1000W 1000W SPL: 85.1 dB 1W/1M (in series) Volume Occupied by Driver .13 cubic feet This is the x2. If these are incorrect from what you are using, then I understand the confusion. otherwise if they are correct.read on........... quote: " [B]it just seems some of your measurements go against the sub designer's[/B]" And hence the reason why no one on here will find another designer like myself. If you want to be stereotypical, that's fine. Take it from someone who is an acoustical engineer and with military sound experience as well as college training in electronics. Take my advice or not. Either way, I can say I still attempted. I think others on this forum can easily vouch for my degree of acoustic knowledge. I do not mind if you do not use the help, that is at your discretion. So, I am not upset if you do or not. And yes, my requirements do go against the designer of the subwoofer for a very good and logical reason. Because they do not take into a lot of factors that I figure for. They base their responses on an anehcoic .707Q response curve, which I can guarantee will not look the same when loaded. Nor will it act the same. They do not take into consideration driver limitations by purposely limiting them so they can guarantee that their specs will not damage the drivers. but they do not calcualte for the given leeway of efficiency that they are fully capable of. The designer/manufacturer of the drivers give them a safe zone, not realizing that with proper application parameters, the safe zone is too much of a limit. They worry too much about excursion not taking into consideration the full capabilities and differences between linear and non linear response. Trust me. I know what I am doing. I am not in a quarrel about your comment, but I do hope to begin to realize that manufacturer specifications are far from ideal in most cases of audio because they want to make sure that if you design a box they recommend, that you get a stereotypical response and that you do not have to return a damaged item that falls within their return policy, by either overpowering them, or by defect of the design or driver. So, they make sure that the driver has compression limitations, as well as tuning and control limits over what they are really capable of and pay no attention to efficiency and loading effects of even some more non conventional styles. Is that helpful to your concern? [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Help
Enclosure Design & Construction
Help with first ported box
Top
Menu
What's new
Forum list
