Soundimports sell the GRS woofers at.very reasonable prices. I just ordered 20 of the 10” version.
I want to stick to the 6 1/2 inch size. Some have mixed results with deviating from the original design.
Soundimports unfortunately ran out of the original woofer.
Soundimports unfortunately ran out of the original woofer.
I think that looks great. It says 8ohm but an Re of 3.3ohms indicates 4ohm nominal.
Fs of 38Hz is good and Qts of 0.40 is good but I suspect might be inflated as low Qts like that usually means an expensive magnet.
Give it a try though. You will have to do the passive crossover yourself though or use DSP.
Fs of 38Hz is good and Qts of 0.40 is good but I suspect might be inflated as low Qts like that usually means an expensive magnet.
Give it a try though. You will have to do the passive crossover yourself though or use DSP.
Thanks X
I may have to dust off the Behringer DCX.
Sadly there is no source for the PVR mid in Europe.
I may have to dust off the Behringer DCX.
Sadly there is no source for the PVR mid in Europe.
I sure wish I could of built these great speakers but when I did more research I had to come to the conclusion just not going to work in my limited RV space🙁
Neither will me beloved fully upgraded Edgarhorns. I wanted to use the 8" drivers to see what I could gain on the bottom end to hopefully not need subs to free up more space as the only place to put them was behind the XSD.
I have sold the PVR drivers but I still have the GRS tweeters and 18 of the 8" GRS woofers available.
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I decided to build the Frugel Horn Jain with the Mark Audio M200 in copper with solid walnut baffles, something simple without crossovers, etc as can run them with my also beloved and fully upgraded Baby Sophia 10 watt PP amp as plenty of power and should do very well with bass and though a bit big will fit and should work well in the space.
Later on I may build other speakers to try out and none likely to be sealed or ported traditional designs, I like things to be different than the norm though I have build some dang fine versions of each so I might end up doing so eventually.
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I hope someday I get to hear the XSD speakers, never going to have the space for them so never going to build them🙁
Rick
Neither will me beloved fully upgraded Edgarhorns. I wanted to use the 8" drivers to see what I could gain on the bottom end to hopefully not need subs to free up more space as the only place to put them was behind the XSD.
I have sold the PVR drivers but I still have the GRS tweeters and 18 of the 8" GRS woofers available.
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I decided to build the Frugel Horn Jain with the Mark Audio M200 in copper with solid walnut baffles, something simple without crossovers, etc as can run them with my also beloved and fully upgraded Baby Sophia 10 watt PP amp as plenty of power and should do very well with bass and though a bit big will fit and should work well in the space.
Later on I may build other speakers to try out and none likely to be sealed or ported traditional designs, I like things to be different than the norm though I have build some dang fine versions of each so I might end up doing so eventually.
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I hope someday I get to hear the XSD speakers, never going to have the space for them so never going to build them🙁
Rick
I finally got around to measuring the system, setting it up and do some listening.
The SLOB midbass sounds amazing! Much, much better than the naked 18". A lot more impactful, meaty, yet defined midbass.
I decided for no-wings, xo at 70 and 400Hz for now. Will try going up to 470Hz and loer that 70Hz.
Big thank you!!! @xrk971
Your MTM horn top looks awesome. I bet this speaker sounds amazing. Very cool.
The wings will add a little more depth to the bass extension. Not much but should bring it to 50Hz -3dB.
The wings will add a little more depth to the bass extension. Not much but should bring it to 50Hz -3dB.
Thank you @xrk971
I need to give it another pass with wings. I probably tested with wings that were too narrow. How wide are the ones you are using?
My MTM top is work in progress, as can be told from the looks 🙂
The midranges are B&C 8PE21. Originally I was targeting a 45-type SET to drive the pair, just like the 45 Ihave driving the tweeters. Thise Beyma TPL are very efficient!
But for now I'm driving 8PE21 with A/B KT88 and now I'm only using one midrange per side. Toying with these and thinking about other MT options. Too bad nobody is trying the Radian LM10n as it looks interesting to pair with a tweeter like yours!
I need to give it another pass with wings. I probably tested with wings that were too narrow. How wide are the ones you are using?
My MTM top is work in progress, as can be told from the looks 🙂
The midranges are B&C 8PE21. Originally I was targeting a 45-type SET to drive the pair, just like the 45 Ihave driving the tweeters. Thise Beyma TPL are very efficient!
But for now I'm driving 8PE21 with A/B KT88 and now I'm only using one midrange per side. Toying with these and thinking about other MT options. Too bad nobody is trying the Radian LM10n as it looks interesting to pair with a tweeter like yours!
I still plan to build it and have almost everything, minus the baffles.
The woofer unit is finished, some rework is missing.
But my own development sounds so good... I need to find motivation 😀
So many projects...
The woofer unit is finished, some rework is missing.
But my own development sounds so good... I need to find motivation 😀
So many projects...
We had plans but priorities moved around. I would still like to do as commercial produc one day.
I find your setup very interesting. Why are you not fully happy with this mid/high solution?
Does the 8 x 6.5" driver setup seem balanced with one 8PE21?
Are you testing with an active crossover/DSP? Do you have a measurement of the 8PE21 on the baffle you are using?
I have thought of using 8" o 10" divers for SLOB and the 8PE21 (or a 10") on top, that would limit of the SLOB to 300-350Hz, and that still might be ok with the 8PE21.
It certainly is deserving of it. Very special, greatly appreciated your sharing!
Russellc
Hello everyone,
First of all thanks for sharing!
Starting the wood work. have everything internal cncd out of through and through black mdf. The parts look and feel promissing. During conversion from inch to mm the holes where the speakers are supposed to fall into, became a mm too small. They almost fit..... Does any one know what happens if you fit all the speakers outward facing in? in my opinion they would also gain some WAF wich is part of the reason i build these. Current system in the living is Heresys on a b300 tube amp.
some pics...
Thanks in advance for answering!!
First of all thanks for sharing!
Starting the wood work. have everything internal cncd out of through and through black mdf. The parts look and feel promissing. During conversion from inch to mm the holes where the speakers are supposed to fall into, became a mm too small. They almost fit..... Does any one know what happens if you fit all the speakers outward facing in? in my opinion they would also gain some WAF wich is part of the reason i build these. Current system in the living is Heresys on a b300 tube amp.
some pics...
Thanks in advance for answering!!
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The general consensus is that mounting speakers in a push-pull configuration is supposed help with sound quality and would be the best scenario.
That said, there are plenty of SLOBs built with both speakers opposed and firing into the chamber with no complaints.
You would have to reverse polarity on all your drivers to get them to fire into the slot in reverse.
I have no idea if having all the frames in the way would have an affect on output or distortion negatively…or if the proximity of the opposing driver magnets to each other would affect performance.
Are you sure you have room for opposing driver magnets to clear inside the chambers?
That said, there are plenty of SLOBs built with both speakers opposed and firing into the chamber with no complaints.
You would have to reverse polarity on all your drivers to get them to fire into the slot in reverse.
I have no idea if having all the frames in the way would have an affect on output or distortion negatively…or if the proximity of the opposing driver magnets to each other would affect performance.
Are you sure you have room for opposing driver magnets to clear inside the chambers?
If both drivers push in and out simultaneously you still get the vibration-cancelation effect, which is significant.
However, my understanding is that if you have both baskets facing out the increased air volume inside the chamber will lower the frequency where response drops (470Hz in the XSD). This may or may not be an issue for you, depending on your midrange drivers.
However, my understanding is that if you have both baskets facing out the increased air volume inside the chamber will lower the frequency where response drops (470Hz in the XSD). This may or may not be an issue for you, depending on your midrange drivers.
I had the same issue and used a Dremel to enlarge the holes a little bit to fit. It will work with magnets both facing out but you will get a little higher distortion as the asymmetry does not allow full negation of suspension induced distortion. However, the distortion you would get is even order harmonics so it might not sound bad at all. Give it a try with both magnets facing out and see how it goes. Use a 1.5v battery to check for drivers polarity on wiring.
Nice work on XO’s and cabinets! Great looking build.