mrogowski

Interesting....

Another round of testing done this past weekend. This time, using the MJ-18 in a 250 litre Sono-like tube. Check it out if you have a moment: http://testbed.mach5audio.com Best regards, Mark

I got lured here by Denim with the promise of fame, fortune and <insert your favourite beer here>. Mark

Thanks for reposting that..

Here are the T/S specs of it (both coils wired in series): Fs = 32.63 Hz Re = 3.70 ohms[dc] Le = 17374.85 uH Qt = 0.30 Qes = 0.32 Qms = 3.94 Mms = 301.59 grams Rms = 15.686189 kg/s Cms = 0.000079 m/N Vas = 21.93 liters Sd= 444.88 cm^2 Bl = 26.675222 Tm Lp(2.83V/1m) = 89.03 dB

In my latest shipment I received two 'next-gen' 18" protos. The build quality on them is very good, and should make a few folks happy. The Xmax is 27mm but the T/S specs on them are a bit shy of my target, so I am not going to post them here until I speak to the OEM. Here are some shots: Best, Mark

Ok, here's the latest. I received my shipment which included the SPL proto. Here are some closeup shots of it. I will be taking T/S parameters of it today and will be shipping it off to Loyd to pound on tomorrow. Best, Mark

Hi Folks, It doesn't appear that we are going to be getting the more recent data back, so if you want to repost your previous threads, links, or whatever you had, please do so. That way others will have access to them now and in the future. Best regards, Mark

** Update ** A MJ-18 4 Ohm sample will be made up and measurements taken by the OEM in about a week. If all turns out well, and consensus here is positive, a run of them will be done and shipped here in about 7-8 weeks. Thanks, Mark

Hi All, Ok, so a few of you mentioned that a 4 Ohm version of the MJ-18 would be in order. It is coming close to my order time, so a batch of these can be included with the main order. I do however, need some commitment from those who are planning on going with 18" drivers in their setup and are strongly considering an MJ-18 (read buying one). Here are the particulars to this: - The 4 Ohm version will have very similar parameters to the MJ-18. I will request that a sample be made and measured to verify. Any changes in specs will be posted here for all to see. - Consider the price of the MJ-18 to be the starting point - $59.38CA. If I can get it lower, I will, and you will save. - Lead time is ~2 months. Please keep this in mind when deciding. I will keep you in the loop of any changes or adjustments. Also keep in mind that changes in lead times are beyond my control, so please don't get discuraged if it takes an extra week - you will get your product. - I would like to see a $20 non refundable deposit from those who are interested. Payments can be made thru PayPal using sales@mach5audio.com as the recipient. I will require your full name and mailing addy to keep track of things. - The more the merrier, so spread the word. If there's anything I missed, let me know. Best regards, Mark

a 600 watt RMS amp playing music should be fine on 1 of them... I haven't completed enough testing on the box sizes... but judging from its output in 2.25 cuft.. I think it would be fine.. may even help the sq out some... Loyd L. <{POST_SNAPBACK}> I've had good results in a 2.6 cube box tuned to 25Hz. Note however that you will be sacrificing power due to the MAW-12's limited excursion. You run out of excursion at about 225 watts. For SQ, a pair would be more than sufficient tho. Best, Mark

Looks nice and clean. I like it. m

Cool! You have some serious looking product there Best regards, Mark

4 Ohms nominal refers to the driver having a 4 Ohm impedance across most of its operating range. This is different from DC resistance which can measure anywhere from 1.8 to 3.5 Ohms. Hope this helps. Mark

Hey! You stole my avatar! I hereby condemn you to listen to Bose speakers at 125db for 24 hours! That'll teach ya! Mark

Hi Chris, I'm looking at around mid September. Best, Mark

Around $55CA give or take a buck - about the same for the equivilency in MDF. But I was able to bang this off in an afternoon, whereas it would take a couple of days to build a box. Best, Mark

Hi Denim, Nothing yet. I have a pre-order in with the OEM but the rep I deal with is away. Will keep you posted tho... Best, Mark

Hi Everyone, Just thought I'd post here to let those in Winnipeg know that there will be a DIY audio group hosting on September 9 at the University of Winnipeg from 12:00pm to 5:00pm. Location is 2M71 (Manitoba Hall). It will be hosted by Gio M. and your's truly. Home, car, HT, etc will be the topics of discussion including displays of projects from every aspect of DIY audio you can imagine. Swing by and say hifi if you can; stay for a dognut and drink too... Best regards, Mark

Gio has done some cool projects - many he's talked about at his site. Certainly worth checking out: http://ca.geocities.com/gmilitano Best, Mark

Aw man, that's the stuff wet dreams are made of! Mark

Yeah, I laughed out loud when I saw it. I should make that my new Avatar Big thanks to Dan for taking the time to do it. Best, Mark

Holy crap! Those took a real pounding. Thanks for taking a snap of them Chris, it appears I will have to do something about that. Looking forward to reading your review - good or bad! Best, Mark

Hi Unit, You're right, there will be a 15" coming. Its a finish to the MAW line so it will be a dual 4 Ohm (nominal) vc and 500 watts RMS power handling. Here are the specs (from the manufacturer): MAW-15 Fs = 24.6Hz Re = 4 Ohm (both coils connected in series) Qms = 5.06 Qes = 0.35 Qts = 0.33 Rms = 7.2kg/s Cms = 0.18mm/N Mms = 236.7gr Bl = 20.4 SPL = 90.9 VAS = 190L Le = 2.41mH Xmax = 13mm These may vary a bit as I take my own measurements when I receive the order. I select a few units randomly, exercise the suspension and test them before posting the final numbers on the site. Best regards, Mark

Ha! Time will tell my friend... m