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Alpine SWR-1241D is a trooper
This enclosure also works great with the original series SWR-1241D!
I saved this old driver from the bin!
Measured (blue) compares great to Hornresp sim (green).
May she live-on loudly....
This enclosure also works great with the original series SWR-1241D!
I saved this old driver from the bin!
Measured (blue) compares great to Hornresp sim (green).
May she live-on loudly....
Attachments
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Greetings,
This my attempt to revive this thread because I'm planning to build this sub with different woofers.
What type of cone is preferred? Paper based or polypropylene? What's the compression ratio of this design and which of these cones are more suitable?
I won't be driving these woofers to the limits since my modified nad 214 is only capable of delivering around 130 Watts @ 4 ohm per channel. Minidsp will provide high pass @ 18hz/48dB and low pass @ 60hz/48dB. In the future some basic eq to optimize response for listening position. If the first tapped horn is a success I will likely build a second one.
Okay since the lab12c (350 euro) and the r2-w12d2 (300 euro) are quite expensive over here I've been messing around with some other drivers:
- gziw 300 (around 120 euro)
- gziw 300x-II (at the moment 95 euro with discount)
Since Sd wasn't specified I choose the same value as the w12d2. I've even used the Sd of the lab12 and made some spl graphs for comparison (not posted). These came within 1 dB difference. The other problem was Xmax value. There are apparently different standards for measuring and on top of that it is not specified in the pdf whether these are linear 1 way, both ways or Xlimit... I've used these values to get to the max input voltage while approaching max diaphragm displacement. Given the large surrounds on these woofers it just might be the desired realistic Xmax....?:
Specs:
Hornresp gziw 300 @ 2,83V and 45V max spl:
Hornresp gziw 300x-II @ 2,83V and 32,5V max spl:
300:
300X-II:
This my attempt to revive this thread because I'm planning to build this sub with different woofers.
What type of cone is preferred? Paper based or polypropylene? What's the compression ratio of this design and which of these cones are more suitable?
I won't be driving these woofers to the limits since my modified nad 214 is only capable of delivering around 130 Watts @ 4 ohm per channel. Minidsp will provide high pass @ 18hz/48dB and low pass @ 60hz/48dB. In the future some basic eq to optimize response for listening position. If the first tapped horn is a success I will likely build a second one.
Okay since the lab12c (350 euro) and the r2-w12d2 (300 euro) are quite expensive over here I've been messing around with some other drivers:
- gziw 300 (around 120 euro)
- gziw 300x-II (at the moment 95 euro with discount)
Since Sd wasn't specified I choose the same value as the w12d2. I've even used the Sd of the lab12 and made some spl graphs for comparison (not posted). These came within 1 dB difference. The other problem was Xmax value. There are apparently different standards for measuring and on top of that it is not specified in the pdf whether these are linear 1 way, both ways or Xlimit... I've used these values to get to the max input voltage while approaching max diaphragm displacement. Given the large surrounds on these woofers it just might be the desired realistic Xmax....?:
Specs:
Hornresp gziw 300 @ 2,83V and 45V max spl:
Hornresp gziw 300x-II @ 2,83V and 32,5V max spl:
300:
300X-II:
Last edited:
I had done a tapped horn with the reference 1260W but do not now these are
still available, good woofer for not to much money.
Car subwoofers do work more easel y in tapped horns because of the strong and heavy cone and sometimes long throw.
Also I have upload pics of a dual chamber, one closed other a pipe with slot. do not bad with 1260w.
still available, good woofer for not to much money.
Car subwoofers do work more easel y in tapped horns because of the strong and heavy cone and sometimes long throw.
Also I have upload pics of a dual chamber, one closed other a pipe with slot. do not bad with 1260w.
Attachments
![DSCN5317[1].JPG](/community/data/attachments/1117/1117829-6961865f7f50ce7385527deae9b31b0b.jpg)
It doesn't look like a driver with that kind of Xmax nor does it have the price of one. Some other Groundzero drivers have (p2p) mentioned, so it's safe to assume the Xmax is peak-to-peak.
+1 on the Infinity 1260, I couldn't tell the difference with the Lab12 in Cubo Infra, unfortunately discontinued years ago in the Netherlands. With the power and processing you've available, I wouldn't care much for the cone material and compression ratio tbh, it should stay well within its limits