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123Toid
(@123toid)
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30/01/2020 3:47 pm  

I'm introducing the Mini Dinas here. Want to give you guys some ideas of the trials I've had while building these. So here's my first design. I thought I'd use the Fountek Fe85 and the Tang Band W5-1138 subwoofer. The thought was to make it a boenicke W5 clone. But the more I researched that speaker, I quickly realized I did not want to clone it. I'll go more detail later. so I decided to try these two out and see how they would work. I got a few measurements and I'm honestly not impressed with the FE85. It has a really weird response. But here are the test enclosures in the original design. I tested everything and created a crossover, which was a lot more complex than it should be.

IMG 20200106 115050
IMG 20200106 115050

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123Toid
(@123toid)
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30/01/2020 3:50 pm  

Once I designed the crossover, I built these enclosures. But there were two problems, The first was the first crossover I created just dipped down a little too low in the impedance for mini desktop amplifiers to handle. That was fine with something like a ice power amplifier, would I envision most people using something more like the SMSL that I recently reviewed.  The second problem, was when you gave it significant power you did have chuffing at certain frequencies. No it was rare, but it was definitely audible.

IMG 20200127 140934
IMG 20200127 140920

 

In order to combat that, I decided to widen the enclosures a little which would give me more room to make a taller port. This did make a big difference, but it still hasn't gotten rid of it completely. 


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123Toid
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30/01/2020 3:53 pm  

I'm going to be trying at least one more enclosure, but this one with passive radiators. The cost will go up, but I'm hoping for a much better sound. The only issue that I'm still debating is whether to switch out the full range driver. I'm thinking of switching to the RS100-4. It'll match the radiators better and honestly I think it will sound a lot better as well. Especially since I haven't really been that happy with the FE85

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The look I'm considering is one passive radiator on the front and one on the rear. The speaker will need two passive radiators. The way that would look, would almost be like a tweeter up top with a mid-range underneath it and then a subwoofer on the side. now most people are going to wonder if you can use these on the normal Dinas and the answer is no. At least not the way that it's currently designed. I would have to make some changes to the volume in order for it to work properly. Right now it's all theoretical and whether it's going to work anyway. So I plan to build some enclosures hopefully next week to see how it works. 


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Mumbles202
(@mumbles202)
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22/02/2020 10:27 am  

These look promising. The idea of the Dina's I loved but the real estate was something I didn't have. Are these aimed at HT or a desktop setup? How about the driver you used in the Reveal line or the PS95?


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DIYAudiphileElliottBridge
(@diyaudiphileelliottbridge)
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22/02/2020 10:43 am  

I know you say they are mini-DINAS, but because they are small are they still worthy of the name Do I Need A Subwoofer? I suppose we'll just have to see when Toid has finished. ;D


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123Toid
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23/02/2020 11:14 am  

@mumbles202

This is more assumed for the desktop. With only a full-range driver handling the highs, your off-axis suffers. 

@diyaudiphileelliottbridge it does have powerful bass, but since I shrunk the size, it doesn't go down as low. Still pretty good for a desktop unit.

 


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Mumbles202
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23/02/2020 8:39 pm  

@123Toid that's good to know about the desktop setup. Any ideas as to driver you're going to use to replace the full range driver? Won't adding a passive radiator increase the size of the box even if you're just allowing for the physical dimensions of the radiator?


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123Toid
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23/02/2020 8:48 pm  

@mumbles202

Technically, yes. Realistically, with the amount that would be inside the box, the tuning frequency would be very minimalistically changed, if at all.  Keep in mind the port is going away, which gives would account for some of that internal volume. Of course I'm assuming front mounting the passive radiators. Then all you have is very little actual cubic feet being taken up. Keep in mind, they have no motors and the space in between the basket is all free air. 

 


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123Toid
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24/02/2020 1:35 am  

@mumbles202

I may have decided against changing out the full range.  At first, I thought I definitely would, but on axis, on a desk, they sound pretty good.  They have a slightly darker sound to them..  I have tried out movies and music and do like them.  I haven't made a passive radiator version yet, since the new box design took away all my fears.  I am not sure the passive radiators are really necessary.  I probably will build one more test version with a different full range.

 


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Mumbles202
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24/02/2020 8:44 pm  

@123Toid

That's interesting. So sticking with the same sub/driver and same ported box design? What are rough dimensions if you don't mind me asking? Curious what kind of footprint they have.


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Mumbles202
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11/04/2020 12:45 pm  

Ever make any headway with these? Seemed like a nice desktop option.


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123Toid
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13/04/2020 12:00 am  

@mumbles202

 

The Fountek really aren't a  good match, so I am switching back to RS100-4.  I haven't got a chance to cut out the new front baffle yet. It is approximately 12" tall, by 6" wide and 9.5" deep. About the perfect size to sit right next to a computer screen. 

I ended up getting side tracked with the Dinas Boombox and a soundbar I am making my sister for a present for her new house (closing this week).  I also started on a custom project for a movie studio.  I can't reveal details about that right now.  Hopefully I can in the future.  But I am hoping to have the Mini Dinas up real soon.   


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Speaker Toni
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13/04/2020 10:40 am  

What exactly is wrong with the Fe85? I wanted to use it for some projects as well because it looks good on paper. Thankfully I never got one as it apparently seems to have some issues. 

Im curious to see the final crossover plans in the future. The Boenicke W5 looks similar but isn't a speaker I'd ever consider buying. As far as I know the woofer has no crossover whatsoever and it didn't sound that great at most shows I visited. The frequency response looks awful as well. 

This would make a Dinas Mini vs W5 comparison interesting for sure. 


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123Toid
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13/04/2020 11:48 am  

@speaker-toni

This started out as a clone as the Boenicke W5.  The more I researched it, the more I realized I never wanted that as a baseline.  How they designed their crossover and the choices they made, were questionable at best (as you mentioned).  And that frequency response...yuck.

So Id ecided I would improve it, by using the first two set of drivers they used the Fountek FE 85 and the W5 (decided to forgo the rear firing tweeter for the time being). The problem as been, they are so close to sensativity, that the W5 actually ends up overpowering the FE85 even without an Lpad on it.  So that is why I decided to drop the W5 clone and switch it to a Dayton Audio Rs100-4 and still use the W5 woofer.  It's been a hassle gettign here, but I am glad I did.  Seriously, who runs a W5 full range without a crossover?


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Speaker Toni
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13/04/2020 3:35 pm  

Yes, I completely agree. The W5 rolls of nicer than many other drivers but it still requires a crossover. I tried to run it without a crossover for fun but it didn't work at all. According to Boenicke less parts equal better sound in every way, so I guess this kinda explains their weird choices. 

This is surprising. The Vifa is about as loud as the W5 in my set up, they just match up. Since the Fountek is a bit bigger I would expected it to be a few db louder than the W5. It'll be interesting to see how the Dayton compares.

I wouldn't use the rear firing tweeter anyways. Why would they put a tweeter in the back when there isn't even one in the front.


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