so i started this project. its not my first project. I used to muck around with diy stereo 40 something years ago.
Anyhow Trawling youtube has reignited my interest.
To make the best sound system that can be shoehorned into a 1 cubic foot plastic milkcrate. If you go to the Introduce Yourself forum New member Peter from Sydney you can get the gyst of how I've started.
There's even a link to the video I've started to record the project. Works on your google drive account.
Anyhow I need your help. I ordered 2 really cheap horn tweeters from Banggood. They claim up to 30khz and 100 watts. I expect they'll be loud and screechy with not much depth in the mid. Here's a link
Seeking recos for good budget horn tweeters that will fit in a box 90x100x300 mm outside dimensions. They must ship to Australia. I'll keep you posted. Thanks ahead.
All I can say is that the piezo will work, but more than likely will be as you said, a bit on the shrill side. Most are in the 90+ dB range. I know the price is extremely attractive, but you might want to spend just a bit more and get something with a real diaphragm and driver coil. Some may still be excessive, but you'll find more often than not that the majority of them are much more detailed and easier on the ears.
I'd suggest looking at Parts Express to get an idea of what to look for, then scour other sites that would be a better buy for you.
Like I said in your "About" thread, I haven't bought horns in many years, and those were cheap Radio Shack piezo horns. Wish I could be of more help.
You could try DIY Sound Group. I don't know if they deliver to Australia, but you will find commonly recommended compression drivers. I'm certain there has to be a source for the SEOS waveguides in Australia. I think Red Spade Audio is based in Australia, but it may only be articles. It's probably a good resource for finding local suppliers in Australia for compression drivers and waveguides.
Quick update. I accidentally bought the amp without bluetooth. So I had to buy a separate BT receiver. Ugh. Only one benefit, it came with a remote. Hmmm not sure how helpful it is since volume and track selection can be controlled from a phone. It also has a USB and a micro memory card input which could be useful.
A little setback. I was working on it on my verandah and a big storm caused some water damage to the woofer cabinet.
Now bought RCA socket cable to 3.5mm plug for the BT receiver instead of male RCA plugs. Grrrr.
Also bought a cheap soldering iron to solder the speaker cables. Should be fun. I haven't soldered for over 40 years.
Ill let you know how it turns out.
I finally got this working today. It needs tweeking. The $3 tweeters as expected are very bright and lacking midrange but great detail in the upper frequencies. and I'm getting distortion at medium volume from the woofer. Pleased with the Fosi amplifier and the BT receiver. I'll post some photos tomorrow. Cheers from Australia.
I can't wait to see the pictures! Would increasing the order or putting a zobel or tank cap on the woofer crossover help out your woofer distortion?
See attached photos. First thing I'll do to address woofer distortion
is shorten the port. Its currently about 175mm long.
I thought I'd start long and reduce it to see what differencit mafe
Would that be a cause? Charlie I think it was calculated
the length for me. Was meant to be only 50mm or so.
I'll have to find the thread.
What an awesome idea. The milkcrate makes it so portable. I love it! Really cool idea!
Quick question - the distortion you hear, is it present if you remove the sub from the crate? Just trying to narrow down the possibilities.
Yes, it was me who came up with the port lengths. From your "About" post on Sept. 3:
Okay, finally got the chance to run the numbers:
Box will be tuned to 54Hz
32mm D x 35mm L
40mm D x 54mm L
50mm D x 113mm L
Any of these will fit comfortably inside the box.
And you said you were going with the 32mm port. 175 mm is the 5th multiple, but it's definitely too long.
As an aside, I use a store bought 2.1 setup for when we work on the weekends. It is intended for desktops and USB powered. I bought a couple of 2100 mAh battery banks and a cheap Bluetooth dongle from Walmart, and it lasts a long time, All told, probably about $35 invested. Next up I am going to use some wood from an old Victrola Case that had to be knocked apart to make a platform with cloth hold-downs for everything to make it more convenient to transport.