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#501
Actually they look right to me, given the .33Qts that is; actual drivers seem to have higher Qts, but that is why we use Equalization, give those drivers +6dB@30Hz and they will be reaching their physical limits very quickly.
Given you stated budget I don't think you will do much better.

Increase your budget when you are able and look at real subwoofers in the Subwoofer forum, as pointed out many many times that last octave costs really big dollars and/or really big speakers
 
#502
nipper575 said:
Did you settle on a crossover, I recall reading that you had an external XO for it. That would use a 3 way XO, wouldn't it? Also, are those little dash marks on the cone a cosmetic thing, or sonic?
Click to expand...

I'm on the 3rd iteration of the XO, going by ear and the parts i have on hand. Next step is to break out the measure kit and see how much fine tuning it needs. It is a 2-way MTM with XO (i guess) somewhere 300-400 Hz.

The "measles" are very much sonic enhancements. Check out some of the EnABL threads.

dave
 
#503
rabbitz said:
I haven't built this speaker but I do know what Ralph's speakers sound like and this would be close to the early Richter Merlin of around 1990.
Click to expand...

Hey Rabbitz
I have a pair of those Merlin Richters. I also have built a pair of Usher U2.5, which sound quite nice.

Do you have any suggestions on a new design that would blow these out of the water.

What do you think about the Vifa drivers for sale at jaycar at the moment could they be put to good use?
Or do I need to spend more?
 
#504
Moondog55 said:
Actually they look right to me, given the .33Qts that is; actual drivers seem to have higher Qts, but that is why we use Equalization, give those drivers +6dB@30Hz and they will be reaching their physical limits very quickly.
Given you stated budget I don't think you will do much better.

Increase your budget when you are able and look at real subwoofers in the Subwoofer forum, as pointed out many many times that last octave costs really big dollars and/or really big speakers
Click to expand...

Thanks. So from those plots and considering the Qts is on the lower end, the vented looks more appealing to me, but you suggested a sealed box earlier, using EQ (from my sound card's software, yes?) to compensate for the lack of low end. What volume, doesn't seem like it makes too much of a difference from the graph.

Ultimately, I'm hoping someone can tell me what it is I should be doing with these enclosures as I have too little experience to know what's best.

As Christmas is around the corner, dearer drivers are not out of the question but as strange as it may sound, I'd like to try and get these cheap woofers going as it will then give me something to compare to when I do build some true sub woofers. In any case, I'll have a look in the sub forum and see what the damage will be.

planet10 said:
I'm on the 3rd iteration of the XO, going by ear and the parts i have on hand. Next step is to break out the measure kit and see how much fine tuning it needs. It is a 2-way MTM with XO (i guess) somewhere 300-400 Hz.

The "measles" are very much sonic enhancements. Check out some of the EnABL threads.

dave
Click to expand...

Interesting. That strikes me as a low CO point for those mids, so I'm guessing that is no ordinary tweeter either if it has to go that low.
 
#505
nipper575 said:
Interesting. That strikes me as a low CO point for those mids, so I'm guessing that is no ordinary tweeter either if it has to go that low.
Click to expand...

Certainly no ordinary tweeter. In uFonken we get <100 Hz out of it. And it specs to 32kHz. It is unfortunately discontinued. I really hope Mark's new A6s reach the standard these have set (he does have a set of uFonken as a reference)

microFonken.jpg


dave
 
#506
Wow, that's quite a range. I like the look of your PC speakers. Since I built my loudspeakers, it makes my logitech Z-2300 speaker system sound very plain on my main PC. Maybe I'll have a look at the Alpair 6s for a future project.

With your MTM speakers, how do you wire the mids? In parallel? What is the resulting impedance?
 
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#511
Quick box design, roughly 80 litres. Is the driver placement ok, or should they be close together at the top/bottom/centre?

An externally hosted image should be here but it was not working when we last tested it.


I've made it this size so I can choose to either run the box with a port (just a simple Bass Reflex), or block it to run it sealed.

An externally hosted image should be here but it was not working when we last tested it.


Let me know what you think.
 
#512
Actually, after reading this.

ESP - The Linkwitz Transform Circuit

I'm not so sure that I even need to port. I don't need to go that loud. It looks like I can apply EQ through my sound card software. I understand that the site is speaking of a physical circuit, but I'm thinking I can simulate a similar thing with software.

An externally hosted image should be here but it was not working when we last tested it.


I'm think this is what you were getting at from the start, Moondog.
 
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#513
Yes but I think you will need to find some dedicated audio software that is a little more sophisticated than that. My pre-amp uses parametric EQ, you need the digital version of it, I'll search and see what I can find, i may want it also
 
#515
Thanks, that looks very useful. I'm downloading it now.

Can somebody comment on my enclosure? I'm dying of anticipation to get building, haha. How should my woofers be positioned, close to each other or far away? How much planning needs to go into bracing? I just whipped this up and placed a brace at random intervals.

An externally hosted image should be here but it was not working when we last tested it.


I'm completely lost at this stage, I need & would very much appreciate guidance.
 
#516
OK first post (epic noob) but I'm from Australia (Perth-ian) and looking to build some multi ways so this seemed like the thread to ask questions. I went and bought a 58" Plasma last week and it is situated in 6m x 6m lounge room with at the moment no extra audio setup besides TV speakers. I could have bought cheap commercial setup while there but decided DIY would be cheaper, sound better and more fun. Since then I have just been confused 🙂.

I'm not fussed about surround sound at this stage and thought a good 2.0 / 2.1 would be a lot better investment than 5.1 but would build everything with option of expanding at a later date.

At this stage it looks like I'll be building an LM4780 gain clone and use the TV monitor out as the preamp. No idea about speakers and drivers really. I've been looking into building two full range speakers with appropriate horns, which fit due to the size of the room. The other option (based on this thread) would be two multi way floor stands, once again due to not much in the way of size constraints.

I asked some guys I know and I got sent the Wes brochure and recommended Scan Speak, Vifa and Peerless. That is around where my knowledge ends. I'm thinking for the price of a pair of F5s ($650AU) I'll be able to buy the parts and build it with the help of my mates something as good for cheaper or better at the same price. Quick looking around indicated a mid woofer + tweeter would be around 200 or so for each speaker.

That's all I know at the moment 🙂. Not looking for answers looking for points in the right direction of how to study this stuff. I tried earlier in this thread but most of the links to wiki / ebay are now dead. Basically what types of things should I be taking into account for design / budget required / good brands etc.

Thanks, any and all help is very much appreciated.
 
#518
As P10 says, run the brace up the long side, even some 42*19 Hardwood with a bit of MDF between them will work, I find the getting the woofers a little closer together looks neater, just put a spare piece of that 42*19 on the baffle between the woofers for a little extra strength and stiffness.
Go sealed and stuff the box
 
#519
#520
planet10 said:
The bracing would be alot more effective run vertically (each brace should divide a panel such that the sub-panels have a higher aspect ratio than the original).

dave
Click to expand...

Haha, just let me get my head around that one. Is this what you mean? I used Moondog's idea of using the little hardwood horizontal bracing too if I interpreted it correctly.

An externally hosted image should be here but it was not working when we last tested it.


Moondog55 said:
As P10 says, run the brace up the long side, even some 42*19 Hardwood with a bit of MDF between them will work, I find the getting the woofers a little closer together looks neater, just put a spare piece of that 42*19 on the baffle between the woofers for a little extra strength and stiffness.
Go sealed and stuff the box
Click to expand...

I'll place the woofers closer together towards the centre of the box (look at the pic, tell me if that's the idea) and stiffen up the baffle between the drivers like I did with my bookshelf speakers. Do you have any recommendations in regards to cheap stuffing material?

Thanks for the advice, guys.
 
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