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<blockquote data-quote="Art Welter" data-source="post: 91386" data-attributes="member: 52">Re: Subs, what to do if you lack excursion?The sim for a single driver cabinet is by Jerry McNutt, an Eminence designer. I don&#039;t even own the program Jerry uses, I use Hornresp for simulations.I included it because four of these could nearly fit in each of Per&#039;s 4 x2 x2 foot enclosures.Per was the first to mention the MT4, I simply showed him a combination similar.To cram four 18&quot; into one of his cabinets requires the use of a plenum, or mounting speakers on either side of the cabinet, not good for most stacking arrangements.Low Xmax drivers are routinely loaded in horns with 3 or 4/1 compression ratios.Although the plenum I suggested appears to have the &quot;mark of the beast&quot; compression ratio of 6.66/1, since the plenum unloads directly rather than being loaded on to a long air column as in a horn, I don&#039;t share Uwe&#039;s concern as to cone destruction.As far as Uwe&#039;s statement that &quot; the large plenum of the MTL4 creates the second resonator&quot;, I think if he models the chamber, he will find the plenum resonance well above what we find in this century to be a sub&#039;s useful band pass ;^). You can see it&#039;s primary contribution at 200 Hz in the frequency response.When Dave Gunness designed the MT4 system, the idea was to cram as many drivers in small boxes as possible, with as little collateral sonic damage as possible. The MT4 system could out scream Clair&#039;s S4, Turbosounds&#039;s TMS-3, Meyers MSL-3, my H-38/L4 system and most anything else I recall at the time.In the mid 1980s after loosing in a direct shoot out to the MT4, I changed my L4 design from an offset horn load to a &quot;V&quot; shaped plenum/BR hybrid to &quot;keep up with the Joneses&quot;.The manifold quad driver mid/high in the MT4 system results in too much throat distortion at high levels, but the LF and low mids are still pretty viable, other than the usual Hoffman&#039;s Iron Law restriction, low, loud, small-pick two.Back when records were vinyl, there was little LF below 50 Hz in most pop music, so a small, loud bass cabinet that dropped like a rock below 55 Hz was largely accepted.Art &quot;Mr.History&quot; Welter</blockquote>

[QUOTE="Art Welter, post: 91386, member: 52"] Re: Subs, what to do if you lack excursion? The sim for a single driver cabinet is by Jerry McNutt, an Eminence designer. I don't even own the program Jerry uses, I use Hornresp for simulations. I included it because four of these could nearly fit in each of Per's 4 x2 x2 foot enclosures. Per was the first to mention the MT4, I simply showed him a combination similar. To cram four 18" into one of his cabinets requires the use of a plenum, or mounting speakers on either side of the cabinet, not good for most stacking arrangements. Low Xmax drivers are routinely loaded in horns with 3 or 4/1 compression ratios. Although the plenum I suggested appears to have the "mark of the beast" compression ratio of 6.66/1, since the plenum unloads directly rather than being loaded on to a long air column as in a horn, I don't share Uwe's concern as to cone destruction. As far as Uwe's statement that " the large plenum of the MTL4 creates the second resonator", I think if he models the chamber, he will find the plenum resonance well above what we find in this century to be a sub's useful band pass ;^). You can see it's primary contribution at 200 Hz in the frequency response. When Dave Gunness designed the MT4 system, the idea was to cram as many drivers in small boxes as possible, with as little collateral sonic damage as possible. The MT4 system could out scream Clair's S4, Turbosounds's TMS-3, Meyers MSL-3, my H-38/L4 system and most anything else I recall at the time. In the mid 1980s after loosing in a direct shoot out to the MT4, I changed my L4 design from an offset horn load to a "V" shaped plenum/BR hybrid to "keep up with the Joneses". The manifold quad driver mid/high in the MT4 system results in too much throat distortion at high levels, but the LF and low mids are still pretty viable, other than the usual Hoffman's Iron Law restriction, low, loud, small-pick two. Back when records were vinyl, there was little LF below 50 Hz in most pop music, so a small, loud bass cabinet that dropped like a rock below 55 Hz was largely accepted. Art "Mr.History" Welter [/QUOTE]

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