can anyone help point me towards someone in oz that can help me to get my front baffles for my 2 ways done? i dont have the skill or tools to do this and do not intend to add building mountains of speakers to my already out of control diy habit. i am building 2 ways with scanspeak 21w/8554k and d2905/9700. they are only 2 days away from arrival. i will be driving them with aleph jx for bass and f5x for highs, sourced with dual ackodacs and digitally crossed. i will add a pair of subs powered by lme49830 and semisouth r100 or toshiba 2sk1530/j201 down the track after these are done.
i can probably wrangle the design/cad and build the rest of the cabinets, but need someone to help me execute the baffles. payment can be skillshare, cash, or a mix of the above, i can also source many fantastic amp and cable parts at very good prices for bater. i'm open to all sorts of ideas and not set on a design as yet, but if someone can help point me in the right direction that would be great.
first speaker project here too in case you didnt guess. i like the idea of mdf with tassie timber veneer and it would be ideal if it were in brisbane so i could pop my head in and possibly learn something
i can probably wrangle the design/cad and build the rest of the cabinets, but need someone to help me execute the baffles. payment can be skillshare, cash, or a mix of the above, i can also source many fantastic amp and cable parts at very good prices for bater. i'm open to all sorts of ideas and not set on a design as yet, but if someone can help point me in the right direction that would be great.
first speaker project here too in case you didnt guess. i like the idea of mdf with tassie timber veneer and it would be ideal if it were in brisbane so i could pop my head in and possibly learn something
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Thanks mate, don't waste too much time looking for them, you've already done me a favour.
I'm sure someone here will be able to give you a hand or point you in the right direction.
It will do 200W into 4 ohm at the same rail voltage as 135W into 8 ohm so should be plenty.
Always remember if you do 4 drivers series - parallel, the power required is only 25% of the single driver to achieve the same SPL, so 135W on 4 series - parallel would be equivalent to 540W on a single driver (which of course it could not handle).
Moondog55 might remember but there was someone here (might even been in this thread) that was offering to do this work for a fee. I know Aslan in Sydney has offered to help diyers for a fee with his new CNC gear. Russel Storey from Stones Sound Studio (close to Queensland border) might be able to point you to someone.
cool, cnc from someone who is not a stranger to working on speakers would be perfect. easy enough to find somewhere to get cnc done from a file, but someone who is able to look at my design and ask me if i really want it like that, or make an assessment of the design when its done for the entire cabinet would be great. i'll search the thread again with that in mind, but moondog55, if you see this can you drop me a pm? or its its helpful to the thread post in here, i dont mind. i'll drop aslan a line also
Yeah, I was looking at the wrong amp initially (K5150).
Ok, I didn't realise it worked like that, good to know.
Long time since I've made a post. Finally had a day that I could put towards the amplifier. Still have plenty to go before it's completed and it's unlikely to be done for another month due to a lack of time (I prefer to work on things consecutively rather than in dribs and drabs). Considering I've already broken my own rule by half building the amp and PSU, I want to knock over the rest in one big swoop.
Still need to buy a toroid and a rectifier, the PSU board has a section for an auxiliary supply (think it's a regulated 15 volt supply). Don't know if I really need it so I've left those components off the board. Main reason for not doing it would be to reduce the cost of the transformer that I will be buying. In saying all that, I was half toying with the idea of putting a fan inside the enclosure I will end up building for this amplifier. I'm not sure what the effect of putting a fan on the amplifiers power supply would do, something tells me that the electric motor would introduce a lot of noise. Maybe building the auxiliary supply up isn't such a bad idea, but I would want it at 12V max. I'm aware that the fan isn't really needed, I just thought it was a neat thing for me to try.
Still need to tap the heatsink (thanks again for those, Moondog) before I solder the driver & output transistors onto the board. Need to wind the inductor too, that's going to be something new for me.
Still need to buy a toroid and a rectifier, the PSU board has a section for an auxiliary supply (think it's a regulated 15 volt supply). Don't know if I really need it so I've left those components off the board. Main reason for not doing it would be to reduce the cost of the transformer that I will be buying. In saying all that, I was half toying with the idea of putting a fan inside the enclosure I will end up building for this amplifier. I'm not sure what the effect of putting a fan on the amplifiers power supply would do, something tells me that the electric motor would introduce a lot of noise. Maybe building the auxiliary supply up isn't such a bad idea, but I would want it at 12V max. I'm aware that the fan isn't really needed, I just thought it was a neat thing for me to try.
Still need to tap the heatsink (thanks again for those, Moondog) before I solder the driver & output transistors onto the board. Need to wind the inductor too, that's going to be something new for me.
I remember the mention but I cannot remember who it was that was offering the CNC service and a quick search revealed nothing either
Fan inside is not a great idea unless absolutely necessary. As long as the heatsink is close to the required °C/W, then it's not required.
It's surprising how annoying fan noise can be.
Point taken, the heatsink I have is fairly large and the same that was recommended by altronics on their site. Based on that, I haven't looked into how much heat this sink is capable of dissipating but I'd be fairly confident that it will be enough. Assuming that this same sink is capable of keeping the chips cool on a 4 ohm load (as you know, this amp is capable of producing 200W into 4 ohms), it should have no trouble keeping cool on my 8 ohm load.
If it's the recommended size then it will handle it easily. SC usually has a good bugger factor in their designs. All my SS amps run luke warm and never get hot so I have the feeling that the designers over rate the heatsink requirements to be cautious or to cover the head bangers.
I'm back after a lot of being busy designing amps and generally with everything. Ended up ordering a 41Hz kit since ordering all the components looked like it was going to be a pain and I knew I'd forget something.
Now back onto ordering speakers!
Got a quote today for PL18 + XT25GT and the PL18 are $150 each and XT25GT are $45 each or thereabouts. I'm guessing a lot of the problem with the PL18WO is that it has been discontinued. Any ideas on what I could substitute in to either reduce price / sound better at same price? If PL18 is just the ducks nuts and there aren't really good alternatives I'll just suck it up.
It's best to stick with an established design unless you want to go down the design it yourself path. You might save a few dollars on the drivers but you will spend more than the cost of drivers with crossover parts to do the crossover design and tweaking.
If you are looking for a cheaper alternative driver, the Peerless 830875 is a good performer at a bit more than half the price of the PL18. I've used it with the DX25TG05-04 tweeter as well as the SEAS 27TDFC. You just need to find a suitable design. Another could be the Scan Speak 18W8434G00 but I've never used it or seen a design for it.
If you are looking for a cheaper alternative driver, the Peerless 830875 is a good performer at a bit more than half the price of the PL18. I've used it with the DX25TG05-04 tweeter as well as the SEAS 27TDFC. You just need to find a suitable design. Another could be the Scan Speak 18W8434G00 but I've never used it or seen a design for it.
Unsure of price of building enclosure but the higher cost of PL18WO means I may as well go the whole hog and build the full Troels XO as well. I'm guessing when that combined with cost of enclosure I'm going to be well and truely entering the price range of a set of F5s from TLSK. Think it's worth me just going with a pair of F5s instead?
If it's probably going to sound a lot worse I obviously won't. Just seems at this stage a lot of what's involved is beyond me. I'd like to get into DIY a bit later so I'd probably start from scratch with a couple of bookshelves and smaller amp when I have time to research and tweak.
Ideally I'd love something like Zaph|Audio - ZA5 Speaker Designs with ZA14W08 woofer and Vifa DQ25SC16-04 tweeter in both price range, design, basically everything. Just sucks that can only get those drivers / kits in US and the shipping to Aus is quite the expensive.
I wouldn't look at the F5 as they use the PAE drivers which are good value but not in the same league as the PL18 and the tweeters I think are the D19.
If your heart is set on the ZA5 then go for it. The Aus dollar at the moment is very good and if it's this kit, then will be a lot cheaper even with shipping than the PL18, XT25 and xo parts.
https://www.madisound.com/store/product_info.php?cPath=35_468&products_id=8648
If your heart is set on the ZA5 then go for it. The Aus dollar at the moment is very good and if it's this kit, then will be a lot cheaper even with shipping than the PL18, XT25 and xo parts.
https://www.madisound.com/store/product_info.php?cPath=35_468&products_id=8648
Thanks for all the help. Sounds like the Troels PL18+XT25 is worth it so I'll just cut out the umm-ing and ahh-ing and order it all. Goodbye budget but oh well what is money for except toys :-D.
Also decided since I'm spending that much on drivers I'll just build his XO since skimping $70 at that point is just silly.
Would consider the ZA5.* series more, but I just hate the idea of spending such a large fraction of the price on shipping since it seems like a "waste".
In other news I drew up schematic and did a full layout for a LM4780 design based on the PA03. However ordering the components (ie online store) was just too annoying and I knew I'd forget bits and somehow end up making it not work. Instead 41Hz Amp10-Basic should be here soon and ordering the transformer for it this week! Any advice on cases? I have a few random stores online but thought it better to ask incase there are some well known gems.
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