Quentin Jarrell

that calculator is pretty damn close to doing it by hand. Remember Winisd doesn't model bandpasses correctly. It seems to make the gain on the low side. I calculated about 10 by hand using the Loudspeaker cookbook and the car stereo calculator was extremely close on all of them

My Nemess pucking rocks. There is a Nemesis Copper clone that is out there... I want it for work. still dont understand why this stuff isnt mainstream. it seems like a no brainer.

use the same parameters. The two ohm coils I use have the same OD as the dual ones there for motor force factor remains the same. there fore parameters remain the same.

not a problem just keep bumping my product page

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ideally you would want a 9.7 inch diameter port for two 12s tuned to 30 hz. However you may not "hear" any port noise. If you have the space build a port with 75 square inches of surface area.

you would use a subsonic filter as normal to limit unloading.

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sounds like its gonna wang

One good note is the new coil is WAY WAY cheaper. The way its looking now I just might be able to sell the 15 for ~$525-$550 plus shipping. So you could have it at your door for $600-$625

no, I won't offer the spl coil. due to inductance the daily coil will be louder on less power. When the new coils come I'm gonna build it into a 12 and slap it in my DD and throw a few IA 20.1's on it.

It does now that you say that. I like to micro manage, i'm just gonna make a bunch of stuff then hand it over to a professional and let them perfect it.

should have it playing in a few weeks. The current gap is larger than it needs to be but it'll give me a close idea of where the soft parts need to be and what it'll do on power.

The formula used to calculate this rating uses the FS of the system as it's the point of greatest xmax. High pass filter is not a concern as cone movement is reduced with higher frequencies.

So I screwed up the modeling. Had twice the amperage set. BL should be 19.4 at 1.6 ohms with a mff of 235. below is the fea screen shot and coil sheet.

adjustments made

ok, adjustments made

Just received an email on the finalized coil that'll be in the Magnetar. As soon as photobucket is back up I'll upload the FEA and coil spec sheet. I will have to adjust the top plates and make the gap tighter as this coil is a good bit smaller than the spl coil. The finalized one ohm coil will have an Re of .8 ohms. Seriesed at 1.6 ohms the motor will have a modeled 38.7 BL which gives it a motor force factor of ~937. Still pretty stout for a daily driver. With this coil it'll have a linear xmax of ~47.5mm and will have a rearward mechanical clearance of 62.5mm. The new soft parts for the frame being worked on that'll be avaliable this fall will be linear to ~55mm one way so they will support this motor. The coil is a 8 layer flat alluminum coil so it should handle ~3,000 - ~4,000 rms and 10 k for burps. we will see what happens once I get the coils in.

You'd be better off with two ported. Cheaper, a ton cheaper when considering power. Would be louder with a MUCH lower roll off and will not have any less "SQ". There is something we call masking effect. In laymen's terms it means that the louder you play your system the more distortion you can induce into the system and it not be audible. When you get above 140 db especially in the sub realm you have to get into 40 to 50 percent distortion for it to be audible. So don't get TOO concerned with SQ when trying to get loud. Also I use a true progressive spider pack on my drivers. This basically means the spider exponentially gets tighter as the cone moves. This does several things but the most important is it creates 4th order distortion. This does two things. First it gives a phsycoacoustical effect making the sound appear to be louder and second it increases the appearance of transient response making the sound appear to be warmer and tighter. So in some cases distortion can be your friend.

No I used the 12 templete for the 15 and looked over it. I'll address the transfer function.

PM or email me your list with your paypal address and I'll send a paypal invoice. I do t like accepting money unless we both have a proper receipt.

This is the deal with ratings. Smaller companies I don't have a clue how they come up with their ratings. All of the big boys use Klippel to verify parameters. They then use the CEA rating (Pat actually had a hand in setting those specs). Basically CEA ratings as power is considered is the power given the will cause a shift in parameters that will make the driver act differently from its original parameters. Basically is says the driver need x amount of power to act as intended. I do the same thing but take it a step forward and give the recommended enclosure for the power needed. It's a bit complicated as this will change in given alignments. The thing to remember that all this all about a rough round about figure NOTHING dealing with transducers are concrete as eveverything changes as the driver is played. We only try to get as close to real world as possible. The main thing as a consumer you want to look at is Large Signal Parameters. Most engineers do not understand this and it very easy to understand. Parameter of a sub played to Xmax and warm is Very different from that same driver played to 1mm. So would you want specs that showed the driver at 1mm (who only runs to 1mm Xmax) or do you want specs that show how the driver acts under normal operating conditions.

Finally someone with a good taste in demo music.

mTwo all it takes is a little money. Getting it built right is the key.