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Eminence NSW6021-6

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USSpeaker has them listed for $749, I may snag a pair as they seem to be an upgrade over the RCF LF21N451 I still run in my dual 21s.

After my B&C/18 Sound/RCF showdown that resulted in the N451 years ago, great to see another contender. Also great to see Eminence respectably jumping into the ULF fray.

 

Oh, hey guys :)

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On ‎8‎/‎30‎/‎2019 at 2:17 AM, WiSounds said:

USSpeaker has them listed for $749, I may snag a pair as they seem to be an upgrade over the RCF LF21N451 I still run in my dual 21s.

After my B&C/18 Sound/RCF showdown that resulted in the N451 years ago, great to see another contender. Also great to see Eminence respectably jumping into the ULF fray.

 

Oh, hey guys :)

Damn bro...It's been a long time.

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After doing some modeling in Hornresp on my own cab design, it looks like the IPALs are still a hair above this driver. The latter costing quite a bunch less, having basically the same weight and about half an inch less mounting depth makes it very attractive thou. What I like the most is that it seems to boost the 30-50Hz region in my cab while still modeling pretty smoothly. This is a great addition to the market. It's about 2/3 of the way from the 21DS115 to the 21IPAL imo, judging from the models.

Can't wait for the other manufacturers to up their game in the 21" market. A ~2.5KW 25mm Xmax low inductance driver under 1 grand would be heaven, still kind of realistic and a serious statement.

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Is your modeling with constant voltage or constant wattage?  Depending on your amps, you might be able to get more useful output into the eminence.

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35 minutes ago, SME said:

Is your modeling with constant voltage or constant wattage?  Depending on your amps, you might be able to get more useful output into the eminence.

Constant voltage modeled at 1W into Znom for voltage sensititivy tests and amp limited to 10KW for the maximum output models. 10KW into two series IPALs should be achieveable with a K20 (one channel) or X4L.

This cab is the type of cab that doesn't depend on amps, the amps depend on the cab 😅 I'm very excited about it but I won't spill the beans before I haven't built a prototype and actually measured it. The model uses Ricci's tricks to get to the accurate SKHorn simulation and uses complex inductance, so I tried everything to get it as reliable as possible and it looks damn nice. Just need more drivers, more free time and lots of plywood. Already got the CNC 😁

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On 9/3/2019 at 8:39 PM, peniku8 said:

This cab is the type of cab that doesn't depend on amps, the amps depend on the cab 😅 I'm very excited about it but I won't spill the beans before I haven't built a prototype and actually measured it. 

Looks somewhat similar to a design I had a few years ago but ended up going in another direction. IF it's the one I've seen a few screenshots of. Good luck in the endeavor. 

As far as this Eminence driver goes I hope they get their stock built up soon. I need that 2nd pair eventually. 

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2 hours ago, Ricci said:

Looks somewhat similar to a design I had a few years ago but ended up going in another direction. IF it's the one I've seen a few screenshots of. Good luck in the endeavor. 

As far as this Eminence driver goes I hope they get their stock built up soon. I need that 2nd pair eventually. 

You can see parts of it in the SKHorn thread where I illustrated the vent blocks. Will probably be long til I can even think about building one, but I modeled a downsized version with only a single driver and it looks like I'm at least building a prototype within the next few months. The hornresp model shows a voltage sensitivity averaging 98db from 30-100Hz with the 21DS115-4 and it's +-3db from 30-150Hz in the ballpark of 250-300L external volume. I'm basically aiming for a "compact" 21" cab which is not a direct radiator. This is the first Hornresp simulation I've done without actually recreating the cab in Inventor, but it should kinda work. For the big version it was the other way around, I just had this crazy idea and built it in Inventor. Then measured it and put in the parameters into Hornresp and started tweaking. IPAL models best, no surprises here. Crazy good driver, but also crazy heavy, crazy expensive and amp-crazy.

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Built the cab in Inventor today and simmed it according to the CAD model. First graph is the Eminence at 1W into Znom. The DS also models very nicely (for system EQ) because it looks like only two PEQ points would be needed. In all the models I made (also from the big design) I noticed that the Eminence seems to drop off a little earlier compared to the DS or IPAL.

The interal volume ended up at 40L less than I anticipated, which is why the tuning rose to 33Hz. I will probably make it a little larger and shorten the port (currently 60cm long, no bend). The pic is 300L external, 60kg with the driver.

D6wawUb.png

 

As comparison, here is a sim more to my liking: 30L more rear chamber volume, 5cm shorter port, 21DS115-4 at 2V:

popEoTY.png

 

Looks like a pretty neat cab if not EQ'd for rock live shows. Just don't cross it over any higher than 80Hz to avoid that nasty spike at 170Hz.

I'll make a separate thread once I gathered more info and tested the actual cab. F10 is at 24Hz, roll off is about 26db/octave and group delay about 1 cycle at Fs. Looking good so far

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Quick comparison of the Eminence vs IPAL in my cab. The slightly higher Xmax gives the IPAL .5db over the Eminence when excursion limited, but you can see that the IPAL is about 2db more efficient over the relevant output spectrum.

Red means excursion limited, green is 10KW fed into the driver. So this is an efficiency graph basically.
Red/Green in the Eminence, blue = IPAL.

Edit: Just for reference, the DS hits 130.5db before exceeding Xmax at 45Hz

PCGIyvE.jpg

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After running these for a month or so I'm still impressed at their sound quality and extension. They have some nice weight to the ulf the DS115 did not have and don't exhibit the distortion they did at Fs. I have 2 more to build and can't see myself moving on from these anytime soon.

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