We're building 20 pair of original Pass SLOBs with Moth drivers next month and you're invited!
Speaker Camp - July 2023 - Pass SLOB - Northern California
Speaker Camp - July 2023 - Pass SLOB - Northern California
I'm very excited, Nelson! I've been thinking about building open baffle speakers, but don't have good wood shop tools - all tied up in automotive and electronics. I'm already diggin' the features and appearance. Thanks for doing this!
Greg
Greg
I wish there was a Speaker Camp like this somewhere in Europe....
There are good designs available in Europe, just requires someone to take initiative for coordination and planning 😉
Thanks.
I receive great pleasure from sending my circuits out into the world.
What artist would lock his creations in an attic?
😎
I receive great pleasure from sending my circuits out into the world.
What artist would lock his creations in an attic?
😎
I only know of one, and this was a fictional person in a magical novel:
https://en.wikipedia.org/wiki/Killing_Commendatore
https://en.wikipedia.org/wiki/Killing_Commendatore
And...You will be baffled! 😀You won't be sorry. I'm just wrapping up the active crossover/eq boards.
I won’t be able to make it to California for speaker camp, but maybe I will have my own. I just need to finish the bases under the slot, and mount the woofers and the speakers will be complete. I have a MiniDSP for initial testing and the LX mini/full range EQ to set up right after. I still need to work out all the values and make a digikey order. I will also need to re-arrange my listening space, and find a home in my home for my current speakers. I am running out of space.
I was finally able to find the time to get my SLOBs up and running. I am using the Lii fast8 for the full range, SB bianco 150B350 woofer for the slot. I am using a MiniDSP 2x4 HD to handle crossover and eq for the time being. The fast 8s are being driven by ACAs, and the Bianco by a Emotiva A-150 75w amp. Below is the initial measurement with no eq. The UMIK was at ear height, 1 meter from the baffle.
Crossover set at 80 hz low pass, 160hz high pass. Not too shabby right out of the gate, but that peak around 8k was noticeable. I pulled down the peak at 8800k and pushed up a little at 700hz and got pretty flat. I also boosted at 20hz a little because well, why not.
Here is the final curve versus the original. Made for a great listing session. I am really surprised at how good these sound with minimal correction. I will probably play with the eq a little, but for now I am really happy. A big thanks to Nelson for this project! This really beats my other speakers, and at a fraction of the cost.
The next step to this project will be the LXmini/full rang eq.
Crossover set at 80 hz low pass, 160hz high pass. Not too shabby right out of the gate, but that peak around 8k was noticeable. I pulled down the peak at 8800k and pushed up a little at 700hz and got pretty flat. I also boosted at 20hz a little because well, why not.
Here is the final curve versus the original. Made for a great listing session. I am really surprised at how good these sound with minimal correction. I will probably play with the eq a little, but for now I am really happy. A big thanks to Nelson for this project! This really beats my other speakers, and at a fraction of the cost.
The next step to this project will be the LXmini/full rang eq.
Read the whole thread but could find an answer to my question: Would it be possible to run this slot loaded driver up to say 350Hz without any issues?
It depends on your drivers' frequency response. My Definimax/Lowther combo sound best crossed over at about 120Hz.
Max upper bandwidth is controlled by depth of slot chamber and 1/4-wave cancellation. For example, an 8in dia driver would need a circa 9in deep slot to accommodate the driver bezel and baffle thickness. That’s a 0.229m deep slot and speed of sound is 342m/sec. 342m/sec / 0.229m /4 = 374Hz
A 15in dia driver and 16in deep slot depth on the other hand, will be about 210Hz upper bandwidth.
On my SLOB, I use 6.5in drivers and can achieve about 470Hz upper bandwidth. I use this natural falloff coupled with an electrical low pass at the same frequency to get a 4th order slope for 2nd order electrical filter in complexity.
A 15in dia driver and 16in deep slot depth on the other hand, will be about 210Hz upper bandwidth.
On my SLOB, I use 6.5in drivers and can achieve about 470Hz upper bandwidth. I use this natural falloff coupled with an electrical low pass at the same frequency to get a 4th order slope for 2nd order electrical filter in complexity.
The XSD uses inexpensive drivers with 75Hz fs and achieves -6dB of about 44Hz (nominal sensitivity of 93dB at 2.83v and 1m).
More info here: https://www.diyaudio.com/community/threads/the-xsd-speaker.385717/
If you pick a more premium driver with a lower Fs, you can do a lot better. But since it uses 8 drivers per speaker (same Sd as two 12in drivers), the cost can add up fast.
More info here: https://www.diyaudio.com/community/threads/the-xsd-speaker.385717/
If you pick a more premium driver with a lower Fs, you can do a lot better. But since it uses 8 drivers per speaker (same Sd as two 12in drivers), the cost can add up fast.