Eighteensound 18NLW4000 |
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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1085 |
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@Peter Jan
The PD186 is from that same time IIRC. And something sticks with a topic a few years back where I saw the SB218 processing on a SB28 (they were almost identical). LA48 should still be no slouch against a LA8. I would recommend the TS to buy one of the newer drivers, and build a test cab and compare to the PD186. If in the position to do some measurements, there are many ways to get some real numbers. And in that case I am still very confident that the 18NLW4000 or comparable will come out on top.
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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The real story will be in comparisons of the Bl(x) and L(X) curves for each driver… oddly enough, the small-signal T/S parameters are only a starting point for a design. That goes for the nominal sensitivity value, and all other free-air parameters too.
On the topic of high power, long term usage; the older PD drivers have an advantage of sorts when it comes to thermal compression due to the sheer bulk of the magnet, but I’d wager the NLW4000 remains better controlled and has improved ventilation when being driven with music. Of course, using an optimised port and Class D amplifier with the modern drivers would be another step in the right direction. Klippel data for the 18Sound should be available, if you ask nicely. Edited by toastyghost - 10 June 2021 at 2:26am |
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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When in doubt ... the power compression graph tells you the story. -1dB @ 500W, -3,2dB @ 1000W and - 4,6dB @ 2000W. On a side note : I wonder why so few manufacturers provide those graphs
Fair enough if the cost, time and effort for only that works for you. Whether that or other gains for certain amounts of money, time and effort suits the OP ? That's why I said : "food for thought" and "your gear, your money, your d...."
That statement (initiated by L-Acoustics, I know...) is true by comparing the very, very first (~30 years old) SB218 (with LAB amps - Llc processors) versus the recent SB28 (with LA(X) amps - SB28 setting). The difference in attainable SPL doesn't come all that much from using more recent/better speakers, but rather from the circumstances in which they work (amplification/processing). Not saying better speakers aren't available these days, just putting things in perspective, that's all. As always... your mileage may vary |
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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1085 |
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@Peter Jan
I doubt the 18NLW4000 has that worse power compression figures. A driver like the NLW400 has probably the same amount of coil area and a much more advanced cooling. Let alone the possible SPL with transients would be enough for me. Good example of goinf from an old to a newer driver would be the SB218 vs SB28 from L'acoustics. Though the SB218 did not sound bad, the SB28 could/can replace two SB218's with a smaller VC driver. @tc You could also look at comparable ferrite magnet drivers. To name a few: 18TBW100, 18HW1070 etc.
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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From 4 cabs to 8 cabs (+100% gear) -> +6dB. That equals 4 times louder overall. OR you only need 1/4th of the power and still go as loud as before. Going from 4 cabs to 6 cabs (+50% gear) -> + 3dB. That equals 2 times louder overall. OR you would only need half the power and it'll be as loud as before. Now going from PD186 to 18NLW4000 might seem like a good plan on paper. But both have somewhat comparable sensitivity figures, so in order to get that +6dB extra from a one on one swap, you need to feed about 4 times the power to get that +6dB out of them. In real life use, that's not going to happen, because the 18NLW4000 will run a lot more into powercompression than the PD186. The net result might be a meager 1 or 2 dB when all is said and done. Just adding 50% extra PD186 cabs ( and powering each speaker the same as before ) plain and simple adds a solid +3dB overall, without strsssing any speaker/amplifier more than before and is going to be a lot less costly, compared to replacing all speakers and seriously upping the required power to even get some SPL gain. Food for thought ... As always : your money, your gear, your decision |
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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1085 |
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Note that doubling the amount of cone surface gives you 3dB extra, however total powerhandling doubles, which also gives you another 3dB extra. Thus a total of 6dB potentially when doubling drivers. |
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vertx
Young Croc Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Edited by vertx - 01 June 2022 at 1:36pm |
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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One new speaker 6dB up compared to the old one, will still make for the same 6dB up with all 8 new speakers compared to the 8 old ones. |
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vertx
Young Croc Joined: 14 March 2012 Location: Sydney Status: Offline Points: 578 |
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Edited by vertx - 01 June 2022 at 1:36pm |
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