There might be a photo in this thread somewhere. But basic idea is that you want to line any hard surface adjacent to the back of the cone with felt or foam to prevent a reflection. Further into the cone you can use stuffing without the lining because the angle of the cone is steep.
Does this illustration help?
The poly-fill stops a little behind the driver, so that the cone has a little breathing space, and the poly-fill doesn't get into the driver basket assembly. The felt lining material is fixed to the insides of the walls of the cone (or similar structure).
Attachments
Yes, the light brown area is where the felt is placed. Thickness would be around 10mm - 12mm (roughly 1/2 inch), and a single layer stuck to the walls of the cone shaped cabinet. If the felt is thinner like 6mm (1/4"), then 2 layers.
Good luck! Any more pictures or description of the packaging? The boxing up must be crazy…
Do they get their own aircraft? 😀
Do they get their own aircraft? 😀
These are for a DIYA member in Hawaii, not Walter.🤣
They get packed with EPS foam panels and hard cardboard reinforced corners. Then wrapped in corrugated cardboard box. I’ll see if we can get more photos of how they are packed. I know it takes about 30min to unpack them. FedEx freight is usually how they travel.
They get packed with EPS foam panels and hard cardboard reinforced corners. Then wrapped in corrugated cardboard box. I’ll see if we can get more photos of how they are packed. I know it takes about 30min to unpack them. FedEx freight is usually how they travel.
I'd like to put the rs225-8 in a 2ft3 ported.
The porting would be more for motion control than max output at 30hz.
Would it be fine so long as it it 10-11" wide ?
The porting would be more for motion control than max output at 30hz.
Would it be fine so long as it it 10-11" wide ?
It will be fine. You are on the edge of E(xtended) B(***) T(uning), which gives a shelving(droop, but fairly flat) in the lower bass.
You can diminish this by using an air-core coil in your lowpass(the small extra resistance will raise Qt slightly).
Or, and I like this, you can use a huge port, which will reduce internal volume a bit, and "chuffing?! We ain't got no steenkin' chuffing!!"
I have had the 225-8 be very happy in 44l, just be prepared to try a few tunings to find what's best in situ.
You can diminish this by using an air-core coil in your lowpass(the small extra resistance will raise Qt slightly).
Or, and I like this, you can use a huge port, which will reduce internal volume a bit, and "chuffing?! We ain't got no steenkin' chuffing!!"
I have had the 225-8 be very happy in 44l, just be prepared to try a few tunings to find what's best in situ.
RS225-8 on stock on the UK through the Dayton importer via Amazon. I did buy another pair!
Dayton Audio RS225-8 8" Reference Woofer https://www.amazon.co.uk/dp/B00I9UF...t_i_786BZ84EVH5JGVAVQWRF?_encoding=UTF8&psc=1
Dayton Audio RS225-8 8" Reference Woofer https://www.amazon.co.uk/dp/B00I9UF...t_i_786BZ84EVH5JGVAVQWRF?_encoding=UTF8&psc=1
2cu ft ported could work - I think Aatto had a rather large ported box earlier in this thread but he might have been using an SB29. Just work out your tuning. The nice thing with the TL is that it gets cone control and deep bass extension. 2 cu ft sealed might be pretty good too - easy to check by plugging up the port.
I agree, transmission line should limit excursion all the way down, but for me, that's a big box to mail.
if the 1.2ohm wasn't there (the inductor's resistance), I get.......................
.707 sealed
vb= .81 ft3
f3=fsb=52.6
ported
Vb=1.64 ft3
F3=31
Tune= 30
So, qts gets a squeek higher with the resistor. Using
http://www.mh-audio.nl/Calculators/newqts.html
assuming re=8, I punch in 0 ohms, qts ends up at .38
but add 1.2 ohms resistance (inductor), qts is now 4.2
.707 floats up to 1ft3 for f3=fsb=50hz (basically the same)
while 4th goes to 2.2ft3 with f3 and tune below 30hz
so, 2ft3 tuned to 30hz should work fine.
if the 1.2ohm wasn't there (the inductor's resistance), I get.......................
.707 sealed
vb= .81 ft3
f3=fsb=52.6
ported
Vb=1.64 ft3
F3=31
Tune= 30
So, qts gets a squeek higher with the resistor. Using
http://www.mh-audio.nl/Calculators/newqts.html
assuming re=8, I punch in 0 ohms, qts ends up at .38
but add 1.2 ohms resistance (inductor), qts is now 4.2
.707 floats up to 1ft3 for f3=fsb=50hz (basically the same)
while 4th goes to 2.2ft3 with f3 and tune below 30hz
so, 2ft3 tuned to 30hz should work fine.