Mach5 UXL-18 vs IXL-18 - AVS Forum
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post #1 of 5 Old 08-01-2013, 08:07 PM - Thread Starter
 
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What is the advantage of the UXL-18 over the IXL-18, is it better for ported? I can't justify the extra 400 bucks for two based on this graph



I can see the LMS Ultra is a few dB better, and probably lower distortion, as well as a smaller box, so I can see why it's the most expensive, still would be hard to justify 3x the price compared to the IXL I think though. In sealed it appears the IXL and UXL are practically identical.

These are all eq'd to xmax.
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post #2 of 5 Old 08-01-2013, 09:45 PM
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Hmmm, I get different results in winISD. My numbers show the IXL in a 4 ft^3 enclosure (Qtc 0.796) is down by 4 dB as compared to the UXL in the same enclosure (Qtc 0.582).

I calculated at Xmax for each driver, with LT (f0=35.71; Q0=0.58; fp=20.00; Qp=0.71).

If one looks at the maximum SPL tab which does not factor in EQ, the IXL isn't far behind the UXL at 20 Hz (-2 dB) and exceeds the UXL from 35 Hz and above (by less than 1 dB). Depending on amount of EQ I can see where the are pretty much the same. With a different enclosure size this difference may be even less. $400 is a lot of cash, 3 for less than price of 2. 4 of the IXL's would be pretty cool.

Current Gear: PJ – BenQ PE7700; Receiver - Onkyo TX-SR805; Blu Ray - OppoBDP 103; Turntable - Dual CS-515 w/ Ortofon Super OM10; Amplifiers - OdysseyKhartago, Adcom GFA555, QSC RMX 1850HD; PEQ - Behringer FBD2496 [Near FieldSub], miniDSP 2×4 [Flanking Subs], REW; Speakers - 4 Pi (w/B&C DE250/JBL2226H) × 3 [LCR], Yamaha Crap × 2 [surrounds], Exodus Audio Maelstrom-X18" sealed sub [near field sub], LAB-12 based ported sub tuned to 22 Hz x2 [flanking subs, XO set at 40 Hz]
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post #3 of 5 Old 08-01-2013, 09:49 PM - Thread Starter
 
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hmm, with that EQ I get huuuuuugely over the cone excursion, do you have power set to 800 watts per driver for ixl and 1200 watts per driver for uxl?

and they still are practically identical on SPL. I wonder if my drivers are bad or something.

I changed the LT a bit so the excursion wasn't over xmax.

I'm getting about 2.5 dB increase with 2 UXL over 2 IXL


I get the same Qtc as you

I guess the 2.5 dB makes sense for an extra 12 mm of excursion and 50% more power. I don't think the $400.00 extra for 2.5 dB is worth it though, do you?
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post #4 of 5 Old 08-01-2013, 09:57 PM - Thread Starter
 
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post #5 of 5 Old 08-01-2013, 10:38 PM
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I have the power for the IXL at 150 watts, however the apparent power level is at 950 watts at 10 Hz for maximal cone excursion.

I don't think 2.5 dB is considered significant.

Current Gear: PJ – BenQ PE7700; Receiver - Onkyo TX-SR805; Blu Ray - OppoBDP 103; Turntable - Dual CS-515 w/ Ortofon Super OM10; Amplifiers - OdysseyKhartago, Adcom GFA555, QSC RMX 1850HD; PEQ - Behringer FBD2496 [Near FieldSub], miniDSP 2×4 [Flanking Subs], REW; Speakers - 4 Pi (w/B&C DE250/JBL2226H) × 3 [LCR], Yamaha Crap × 2 [surrounds], Exodus Audio Maelstrom-X18" sealed sub [near field sub], LAB-12 based ported sub tuned to 22 Hz x2 [flanking subs, XO set at 40 Hz]
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