Have you modelled or measured your listening room?
I would always start there as your room might have a notch at 40Hz for any suitable speaker position making it impossible for a small sub. Conversely it might have a peak there making it easy
Brian
I would always start there as your room might have a notch at 40Hz for any suitable speaker position making it impossible for a small sub. Conversely it might have a peak there making it easy
Brian
No I haven't. The room is 3m wide, 5m long and has a slanting ceiling 2.4m tall on one side and 2.7m on the other. This will be on a corner stand against one long wall about 90cm off the ground and in a one box Bluetooth speaker type form factor
Trying to get my head around this. How much amp power would be needed for a 10db boost at 30hz? The reason for asking is that I am trying to model a 23hz tuned box for testing what it will take for this OEM to play flat to 20hz. This results in a very long port, but this might be further folded beyond the simple capacity of the online ported box modeller. How is a foldback calculated for length?
The TS parameters though 😥.
Eek! Are These things are pretty floppy if stretched to 35 hz in a ported box? Measured TS parameters suck compared to factory spec😥 I tried a T-tqwp and it was a bit ‘better’ than the BR for some reason
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Hi, with "floppy" you refer to cone movement and running out of xmax? Or you are talking about sound quality?
We have to be realistic about the limits of a medium quality 5 inch driver (is not a SEAS or anything like that) in a small ported enclosure
The idea was to give a few more hertz of bass to a small pair of speakers (Dali Spektor 2, with and F3 of around 50 hz) in a small room in a near field listening situation and it does that without any issue, will it rattle the whole neighborhood as some 4 x 18 inch setup of some guys around here? Absolutely not
Sounds very clean and way better that any cheap HT sub that you can buy for the cost of the driver + box + amp and it's a simple box so it's a very nice begginer proyect
Cheers
Alex
Thanks for that,
I know this is addressed to someone else, but I would like to raise something regarding implications of such things re my project. I don't know enough to trust manufacturer specs, but do have the equipment to take readings. This is something I have to learn to do. The thing is that I am totally happy with my current setup but have the leisure and materials to peruse some fun and take up a silly target like 20-40hz out of an ice cream container
Mine is just a bite and see approach, so please just take in the spirit of fun DIY tinkering. I might actually get something out of this, if folks are interested in buying such cabs from me. It would be a nice support for a working retirement
Anyway, back to the test box. It doesn't gel with me to make something without a clear purpose, plus there are size implications to 4L with 23hz port. External folding results in a cab size that is similar to 8L with 23hz internal port. 8L models with higher SPL numbers and F3 of 20hz. This is about 10L external and due to port length results in some awkward boxes. So I have decided to give the awkward size a purpose. A 2.1 soundbar with full spectrum at near field. I have given it a generous 3L of extra volume for any built in satellite speakers and amps. The DS18 3.5" FR and DS18 ZR6.2D are the closest off the shelf fit drivers for this cab. I'll have some very similar subwoofers with extended upper range, but I have use for all of them
Post up some width dimensions that you folks would like me to play with in CAD
I tried the same driver in these 2 boxes with the ~same Fb. The ‘bass reflex’ setup sounded strange when driven hard. Upon further investigation the dats v3 revealed the TS parameters where conpletely different than the manufacturer specs. (High Fs/high qts) .
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Is that one of the drivers that I can try in my project? Regarding the specs, surely you wouldn't have been the first person to have used the model. I am surprised that an issue like that hasn't been picked up on already and reported back to the brand! I am sure that they would check for consistency if reported. The DS18 FR that I referred to earlier in the thread has the overview of a completely different speaker up on their site
https://www.parts-express.com/Tang-...per-Cone-Subwoofer-Speaker-264-917?quantity=1
https://techtalk.parts-express.com/forum/tech-talk-forum/58008-voxel-a-mini-sub
I have one more i should try in the ‘voxel’ sub ?
https://techtalk.parts-express.com/forum/tech-talk-forum/58008-voxel-a-mini-sub
I have one more i should try in the ‘voxel’ sub ?
Mine sounded nice and clean, maybe I got lucky and mine was closer to spec (or close to what Paul used for the design), but again, I did not drive it very hard, just to medium volume, and I think that the tuning of the enclosure (in the Voxel case) does not help the driver at higher volumes and that is one drawback of the design
If you want to drive it hard, go with a higher tuning or better / bigger driver and bigger box
Thanks man, I tried to get some tang bands including this initially but the shipping from US is crazy unaffordable. They are not in contention for me
Is the voxel 7L net or does that include driver displacement and port volume? What is the external volume of the voxel? I think we can better that
I think it’s 7.65 liters (gross) minus the port/driver motor gets ~7 liters? That sure is a little port though? 12 cm2?
Thanks, !'ll try for a 33hz tune next. At the moment I am working on the 23hz tune. Fitting this port is a challenge that needs a disguise
I listen to loud bass heavy dub reggae and have to say that I must have been around speakers with good ports as I have never had to remark on port noise. Even on dub with synth bass. It will be interesting to see if the 23hz port is noisy at these small volumes
One thing that I have noticed is that at such small scale, little linear changes have a large effect on volume, so shared space for electronics is a bad idea. A dedicated compartment locks the box in. Being a soundbar format, it is resembling a two segment TL at the moment
One thing that I have noticed is that at such small scale, little linear changes have a large effect on volume, so shared space for electronics is a bad idea. A dedicated compartment locks the box in. Being a soundbar format, it is resembling a two segment TL at the moment
I am punching in those and other numbers into HR tonight. Looks promising. I am inclined to route the exit in CAD around to the front and have it close to the driver and in phase. Is there any merit to taking this effort? Or is a side exit more preferable?
I have come up with this, does it make any sense? 998mm wide x 240mm deep x 120mm tall. Tuned to 20hz and fit for drivers from 3" to 6.5". Cab accommodates 2x 3.5" FR drivers per side. This is a distraction from my goals of a tiny 40hz sub though. Once I have this soundbar Cad model sorted, I'll get back to the 40hz one
