Ricci

Good to hear! Yes REW is an amazing program with a ton of flexibility. It is updated constantly by the author which is something that cannot be said for most other software.

I don't have cabs yet so testing is a ways off. However I'm confident in how it will perform based on previous experience. I'm also confident the B&C DCX464 is going to be a heckuva product. They clearly spent a long time developing it and I'm sure the had the BMS units in their sights while doing so. Competition is great.

Sure you don't want a few more pro 21's?

Results for the NSW6021-6 in the sealed cab are viewable now. 😎

Sealed testing results for this 18 Sound 21 are posted!

Results for the 21NLW9601 driver sealed testing are posted.

There is also the new B&C coax to consider. DCX464-12 The Skram is 4" less deep than the Othorn and a bit lighter, but with comparative performance and more flexibility due to variable port tuning. Might be a consideration.

They are killing me too. I really don't want to have to resort to the bay and eat all of the taxes and seller fees but I have got to get equipment moving out of here. The lone 21ID I may have to put an auction on because I don't know of any DIYers using them. I figured the 9601's would be gone already though. I got a whole pile of 15" car audio type subs I have to offload next. Still got an SI HST-18 MKII sitting here too. $450 shipped and insured.

Still for sale. Qty (2) 18 Sound 21NLW9601 8 ohm drivers. $850 takes both shipped and insured. $750 local pickup. Qty (1) 18 Sound 21ID. $440 shipped and insured. $400 local. I need these gone.

I will be following this. I want to try my hand at a synergy one of these days but just havent gotten around to it.

I dont think it is possible with a sweep signal including low frequencies. Excursion gets too high quickly unless the testing is a much longer duration. I think you would have to use a much different signal type if you want to look at thermal compression only. Something with a lower duty cycle and band limited to Fb and above possibly.

Versatile driver too. Models good in the Othorn, Skram, Skhorn and of course vented cabs and even FLH's if you have the space.

2 Skrams. Smaller and easier to move with 1 person. Larger vent area, even greater tuning options, larger air volume for slightly increased low end. 2 Skrams should be offer a bit higher performance than a single Skhorn assuming that both are using the same drivers.

Huh??? What makes you say that "all of the amps limit"? Speakers are not purely resistive loads. The average impedance is far higher than the nominal and even so 3000 watts or so of true average power into a speaker is a TON of power. You can clearly see trends in the sub compression during the sweeps well before the loudest sweep. There are only a few cases where the amplifier limits during the sweep. Most of them are extremely high power multiple driver cabs (MAUL, Skhorn) or systems with an impedance too low for the bridged K20 ( 1 ohm or 2ohm nominal load,( RF-19, dual 21IPal, SP4 18D1)) or where the SP1-6000 has not enough power. Even in those cases ONLY the loudest sweep runs into amp limitations. In those few cases what is the alternative amplifier that will provide an increase in headroom over a bridged K20 or a SP1-6000? In what case would MORE amplifier than this be put on a single cabinet? The speakers are tested with both a very long duration signal and also very short duration burst signals. The data is there to make judgments on how the cabs respond to both and what will happen with normal signals that are in between. The long term output sweeps do not show heating of the voice coil only. They also show the effects of suspension changes and loss of excursion linearity beyond Xmax as well. There may also be some amplifier limiting in the loudest sweep for passive cabs. All of these things are shown in those graphs. If you want to see the effect of thermal effects only look at the repeat lower SPL sweep taken after the build up to the maximum sweep level. This is the one that shows how much shifting and heating has occurred in the driver with the amplifier and excursion related changes removed.

It should be very close except for the impedance difference. The 2 impedance drivers model almost the same.

Outdoor GP test of this driver in the sealed cabinet are posted. This is a heckuva driver for the money. Enjoy.

I just published the sealed cab testing of this driver. Enjoy! Weekend...Engage!

No thats a front loaded horn or FLH. The back chamber is sealed but otherwise the response and behavior is totally different. That type of cab needs drivers with low Qts/Qes and good inductance behavior.

Exactly...A ton of small boxes sounds like a great idea until you start to consider the amplifier requirements to get their maximum potential. Also wiring and setup is a PITA. Don't forget cost and weight also. Each of those tiny sealed cabs with the MTX driver is about 75lbs or 34kg...multiplied 16x! The GAS comp drivers could be good, or not. I couldn't find an owners manual or complete set of specs. If they do not include shorting rings the inductance will be incredibly high with long 8 layer coils and a big steel pole piece. It looks good on paper but if the inductance is out of control it will exhibit high levels of distortion and a very peaked response shape. There could be shorting rings in the motor but there is no mention of them. I don't even consider long throw subs without shorting rings. The same thing goes for the GZ 15. The main issue I always have with car audio drivers such as this is lack of good information. Also that 12" GAS comp driver probably weighs around 65lbs or more judging by the motor. I couldn't find the weight either. That's a lot of weight if you start using multiple drivers.

Sealed. Also did 4 other pro 21's the same day. Working on getting all of that uploaded to the site. Ill probably run these in the skram enclosure.

Im selling a pair but Im in the US and international shipping would kill any sort of deal on them.

Yes they had to tool a new frame. I have sample drivers with the old frame so I was asked not to post any pics of the back of the driver. Ill be getting a pair with the new frames as well. Also GP testing of this driver is done. It's a beast.

1st post in this thread has the prints.

Near field... That will be something to experience.

Currently I've got a ton of subs that need to move on to someone who will use them more than I do. For sale Sold...Qty (2) B&C 21ds115-4 drivers. 1 of the drivers has a slight kink in the flange of the frame in one area. Driver still functions 100%. Bend could be straightened out by front mounting it or the driver can be sealed using an extra thickness of gasket material. $490 shipped and insured / $440 for the driver with the frame flange issue. $900 takes both. Sold... Qty (2) 18 Sound 21NLW9601 8 ohm drivers. $490 each shipped and insured. $950 takes both. Qty (1) 18 Sound 21ID. $550 shipped and insured Sold...Qty (2) Lavoce SAN214.50 drivers. $420 each shipped and insured. $800 takes both. Sold...