X-tro with ferrite magnets
Printed From: Speakerplans.com
Category: Plans
Forum Name: Punisher and X-tro
Forum Description: Discussion / Questions about the Punisher and X-tro
URL: https://forum.speakerplans.com/forum_posts.asp?TID=93733
Printed Date: 27 March 2026 at 8:46am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: X-tro with ferrite magnets
Posted By: vmh
Subject: X-tro with ferrite magnets
Date Posted: 01 November 2015 at 7:54pm
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So. i have been trying to sell my MT128s to fund the next project but not had any luck and while thinking of what to do instead realised i have a pair of double 15 Peaveys taking up space that i don't use. If i use the 15s from them with the XT8s and 1'' tops from the MT128s i have, i can build a pair of X-tros for just the price of the wood.  (I never loaded the 12s properly as i could not afford the drivers and had to use some old RCFs i had kicking around so it won't be a loss to spit them. And if i sell on all the empty cabinets it could pay for the wood. The XT8s are loaded with the correct B&Cs) While the Peaveys are a long way from ideal, with an EBP of 138 and BL of 17.70 they could work OK. I am happy to loose a bit of quality for saving 1000 euros, or so. The only issue is they have a very low Xmax of 0.9. However i will be using them on top of 4 ASS BS600 and can cross them over around 150 hz, maybe higher if nec. The other issue is i have read here that the X-tros have very tight rear chambers, even with neodymium magnets. I have also read people saying Eminence Kappas are a good cheap alternative and fit with Ferrite magnets. The peaveys i have are quite shallow, with an overall depth of 13.3 and a magnet diameter of 21.5. Anyone know if these will fit and work ok? ------------- It's not how big it is, it's what you do with it! |
Replies:
Posted By: tv00
Date Posted: 02 November 2015 at 9:21am
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Whow, xtro is a crazy heavy cab already! 1: Peformance: Do a simulation if you've got specs, should be fairly easy, specs does not sound good to me, xmax of 0,9 for a 15" is too little, but 0,9 inch is too big, could it be 0,9 cm = 9 mm? 2 Fit: You should be able to detmine this fairly easy, open plan in drawing program, open side view of driver into doc, add transparency, scale to same aspect ratio, see if it fits. ------------- www.facebook.com/babysoundsystem |
Posted By: vmh
Date Posted: 02 November 2015 at 9:31pm
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1: Yea, i was thinking about that Xmax. Is 0.9 mm even possible? Maybe they got it wrong on the website and it is actually 9.0 mm or as you say 0.9 cm. I do have horn resp but i wouldn't know how to work out the horn input parameters. 2: I'm not much of a computer guy. More a builder. it would be easyer for me to draw the plan to scale by hand and put in the driver measurements to see if it will fit. I was just hopeing someone could save me some time. Maybe i'm getting too old. ------------- It's not how big it is, it's what you do with it! |
Posted By: Timebomb
Date Posted: 02 November 2015 at 11:07pm
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From memory the VC overhang on a kappa 15 is only 1.6mm and they do quite well in this type of application, that peavey might only have 0.9mm overhang but usable excursion should be a bit more than that, they might be ok. ------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: tv00
Date Posted: 03 November 2015 at 10:23am
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Whow timebomb your thumbnail looks like turboconcentric ------------- www.facebook.com/babysoundsystem |
Posted By: Timebomb
Date Posted: 03 November 2015 at 11:09am
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Its kinda similar, its an 8" + 1" coax hid-high horn. ------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: tv00
Date Posted: 03 November 2015 at 1:48pm
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Interesting, b&c? I've seen these tops on ebay, what make are they? Anything to do with Mykey? EDIT: I see now they're yours, whow they look really handy, would love to try one, wonder how the range is from 200-400 siwth that fold? When I get rich I'll buy a pair, just to try it:-) ------------- www.facebook.com/babysoundsystem |
Posted By: Timebomb
Date Posted: 03 November 2015 at 1:58pm
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Hi, no nothing to do with Mykey i make and sell them myself as my brand Soundgear. Theres more info on my webpage and my facebook page if your interested. Cheers. James ------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: C-Audiofreak
Date Posted: 05 November 2015 at 4:11pm
| I understand the xtro is a fairly old design so would it have originally had ferrite drivers in it any way? Am curious as I want to build some using oberton 15's as am quite impressed with the quality and sound of the oberton stuff |
Posted By: tv00
Date Posted: 05 November 2015 at 7:34pm
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No it didn't. You have to make a simulation to compare or buy both drivers & test, there's some tricks for driver comparison ------------- www.facebook.com/babysoundsystem |
Posted By: C-Audiofreak
Date Posted: 05 November 2015 at 8:12pm
| Ok please share said tricks 😊 |
Posted By: tv00
Date Posted: 05 November 2015 at 9:12pm
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Google around for xtro hornresp input, I'm sure it's around out there. Happy weight lifting:-) ------------- www.facebook.com/babysoundsystem |
Posted By: C-Audiofreak
Date Posted: 05 November 2015 at 9:14pm
| I'm used to it my amps ar SR707mk1's and I own 6😊👍 |
Posted By: vmh
Date Posted: 07 November 2015 at 1:08am
Just did google search for hornreps input details and got 3 completely different results  ------------- It's not how big it is, it's what you do with it! |
Posted By: Dutchman
Date Posted: 10 November 2015 at 7:27pm
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I don't know why everybody says that is a heavy box, its about 70-80kg. Eaw kf850 at 120 kg that is a bloody heavy box!! Why don't you just build the kick section from xtro? Place the mid and HF box you have on top and that will work out great. The kick horn is about 90cm iirc. Bandpass like, many decent drivers will sound good and push air forwards!!. ------------- We need more SPL! |
Posted By: Dutchman
Date Posted: 10 November 2015 at 7:32pm
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Xtro is not an old box. Its about 10 years old and use really good drivers. 18sound 15ND930 , nd stands for neodymium duh. Why wont ferritte drivers work in them? Ofcourse they will. Put pd1550 in them and you will rip people apart or b&c15nw76 or just a good 15" driver. Just build the kick section apart and the mid and HF horn in a seperate box. Won't be heavy. ------------- We need more SPL! |
Posted By: cravings
Date Posted: 10 November 2015 at 7:43pm
| i may have read it said that the pd drivers don't physically fit in the space in the xtro.. there have been a lot of threads on xtros and cheaper drivers etc.. much worth reading before spending. |
Posted By: C-Audiofreak
Date Posted: 10 November 2015 at 8:44pm
| I'm going to just use the nd930's as if that is what the cab is designed for they are the drivers that sound best I will still build box as one unit |
Posted By: Andy Kos
Date Posted: 10 November 2015 at 11:23pm
 ------------- just a guy with a warehouse and a few speakers... www.bluearan.co.uk |
tv00 wrote:Posted By: Andy Kos
Date Posted: 10 November 2015 at 11:27pm
Ive just built a prototype cab, 800W 15" + 150W 8" + 70W 1" compression driver, all neo components and total weight is 33.4kg so to me.. 70-80kg is HEAVY ------------- just a guy with a warehouse and a few speakers... www.bluearan.co.uk |
Posted By: tv00
Date Posted: 10 November 2015 at 11:36pm
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Bring some pics! U can't just say that & show nothing:-( ------------- www.facebook.com/babysoundsystem |
Posted By: tv00
Date Posted: 10 November 2015 at 11:47pm
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Is it woth the sonitus horn? Hope you found some small 1" horn:-) There's no need of any big horn above 3khz Look at bullits, orbit 4, F1 & tms-2, they're small I really like small horns with a bms 4538 on top of a good high-mid! ------------- www.facebook.com/babysoundsystem |
Posted By: Andy Kos
Date Posted: 11 November 2015 at 12:16am
I'll drop you an email ------------- just a guy with a warehouse and a few speakers... www.bluearan.co.uk |
Posted By: Andy Kos
Date Posted: 11 November 2015 at 12:23am
I did.... but the minimum order quantity for this horn is a touch on the big side.. and once you add in the shipping costs it becomes a bit of a big lump of money for something 'unbranded' with unknown demand. Sticking with 1" horns that are easily available in europe for now. ------------- just a guy with a warehouse and a few speakers... www.bluearan.co.uk |
Posted By: tv00
Date Posted: 11 November 2015 at 11:31am
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Can't you talk bms into making a 60 degreed version of the 2193? :-) It's a cheap small and extremely nice sounding horn with 4538 & 4540nd, I' amazed about how they can play so loud & clear with so little power, they have extremely high sensitivity, so high that the background noise from the xilica xd8080 is a problem! And i have to add xlr-attenuators between this and amp unless I turn down the amp (which is not the safest when renting out) ------------- www.facebook.com/babysoundsystem |
Posted By: vmh
Date Posted: 11 November 2015 at 4:14pm
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Dutchman. I'm not worried too much about the weight. The 15s i have are not so heavy and i'm used to lugging my BS600s around on my own so i can't see it being too much of a problem. If i'm going to go to the trouble of building the kick section it's not much more to build the propper cab and fit the XT8s i have rather than having them seperate. Also i want to use better top horns than i have already. It's not wether the ferrite magnets will work in the cabs but wether they will phisically fit. I have read everything i can find about the X-tro and it sounds like they will fit, even if i have to route a bit out of the access hatch for a bit more clearance. The original plans show them with ferrite magnets. It's just where the clearance between the magnet of the bottom driver and the bottom of the top horn that could be a problem.  ------------- It's not how big it is, it's what you do with it! |