Drivers arrived, boy are they heavy. Now to decide on an enclosure to build, will make a great fall project.
Got another keyboard so have done a measurement for VAS and this came out as
13.0 litres
If anyone is interested, using Winisd and a Quasi Butterworth alignment one gets:
Box volume: 8.9 litres
Tuning freq. : 53.12
Vent: 47mm x 170mm
-3db @ 55 Hz
Or
An Extended Bass shelf alignment one gets
Box volume: 18.8 litres
Tuning freq: 39.4 HZ
Vent: 47mm x 143mm
-3db @ 40 Hz
Should see the Fs go down after running in I guess so it’ll be worth re-measuring then.
13.0 litres
If anyone is interested, using Winisd and a Quasi Butterworth alignment one gets:
Box volume: 8.9 litres
Tuning freq. : 53.12
Vent: 47mm x 170mm
-3db @ 55 Hz
Or
An Extended Bass shelf alignment one gets
Box volume: 18.8 litres
Tuning freq: 39.4 HZ
Vent: 47mm x 143mm
-3db @ 40 Hz
Should see the Fs go down after running in I guess so it’ll be worth re-measuring then.
I just booked up these drivers to break in for a while in their boxes. I noticed there is no polarity marked on the wire tabs. Does anyone have any idea of the polarity?
There is a red mark on the voice coil. That side is positive. The black piece of insulating plastic that holds the to solder tabs, is backwards. The positive is marked as negative, and the negative as positive.
There is a + mark on mine but it’s not very clear. part of it is under the metal on one of the tabs
Mine are in 9l sealed cabs with no stuffing at the moment they sound great in near field in my desk. No Weak bass issues at all. They sound very very tight and snappy. In this situation I’m not sure I’d even bother with venting them.
Mine are in 9l sealed cabs with no stuffing at the moment they sound great in near field in my desk. No Weak bass issues at all. They sound very very tight and snappy. In this situation I’m not sure I’d even bother with venting them.
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Did you connect positive wire on + tab or on tab where is red mark. It seems to me that red mark is by the wire connected to tab with - on plasticThere is a + mark on mine but it’s not very clear. part of it is under the metal on one of the tabs
Mine are in 9l sealed cabs with no stuffing at the moment they sound great in near field in my desk. No Weak bass issues at all. They sound very very tight and snappy. In this situation I’m not sure I’d even bother with venting them.
On my copies there are no marks either on the metal tabs, or on the black plastic thingy holding them. There is only a red felt tip pen slach mark on one side of the cardboard voice coil former. I'll post some pics when I get the chance.
Cindra,
Thanks for sharing the pics - looks like you guys have identified the right tabs.
And as one poster has already suggested, the polarity can be tested using a 1.5v battery if required.
Thanks for sharing the pics - looks like you guys have identified the right tabs.
And as one poster has already suggested, the polarity can be tested using a 1.5v battery if required.
The polarity does not matter really, as long as you connect your positive lead to the same driver terminal on each driver. It’s nice to know though.
My driver's have been breaking in for about 30 hours now so I've begun thinking of a box for them. I've settled on a golden ratio box of near 18 liters or so with a slot port. From the pictures and specs I've seen the CHN-110 looks to be very close to the SOTA-11R. The specs are Almost dead on with Jerryo's measurements with the exception of The (49 vs 44) and VAS (13 vs 24.7). I would think that with break in these specs should come much closer. So for now I'm going to run some cases in Unibox using the CHN-110 specs to see what I can come up with.
Hey there PJN,
you’re getting on well by the sound of it. Seems like you will be using an EBS alignment at 18 litres. As mentioned this gets you to 40 Hz at -3db if Winisd is anything to go by. Excursion will become more of an issue though depending on max SPL aimed for. I’d go with a variable port length so you can change the tuning as the driver shrugs off any stiffness with use, and the Fs drops a little.
you’re getting on well by the sound of it. Seems like you will be using an EBS alignment at 18 litres. As mentioned this gets you to 40 Hz at -3db if Winisd is anything to go by. Excursion will become more of an issue though depending on max SPL aimed for. I’d go with a variable port length so you can change the tuning as the driver shrugs off any stiffness with use, and the Fs drops a little.
Going with a golden ratio box makes the baffle width really set the rest of the box dimensions, and a reasonable width puts you near 18 liters. Unfortunately the tuning required make the port length a challenge. I need to play around some more to see if I can avoid a long or curved port that will fit nicely in the box.