The idea:
It all started when a friend asked me for a small minimonitor for his home. I initially thought of an RS28 / RS125 speaker. After running a couple of sims, it was obvious this was not going to work, since a single RS125 could not handle too much load. The speaker grew, as my friend's interest got smaller (due to the size of it).
The speaker itself isn't that big. But Bose and the like have made people think they can get awesome sound in a 3x3x3 package. Since I wasn't very interested in building a bad speaker in the name of size, I built this speaker to be used at my office. It still had to be built as small as possible, but not to the extreme.
From previous experience, a 4" driver isn't exactly a great idea if dynamics and maximum power are desired - especially dynamics. Then again, this is a speaker for smaller rooms - a 6" would make the enclosure too big, which defeats its purpose. The RS150 driver is a better deal than the RS125, IMHO- but this design really requires the smallest driver possible. As it is,the box may be a bit big for some rooms!
Bass alignment:
It was time to find out what size a pair of RS125's would be comfortable in. To my surprise, they needed less volume than a pair of W4-1370s, which was good. I tried to shoot for 11L, so the external size (considering 3/4" MDF) was 45 x 18 x 26 cms. This would give me an 11.72 liter volume, which I'd tune to 55 Hz for an F3 of 54.98 Hz. Nice.
I used a 2" P-E flared port I had around. At 12.5 cms, the size would not be a problem.
I can't complain about FR - considering the driver is more like a 4" one!
At 25 Watt, I can expect the driver to survive. I wouldn't want much more power than that, though. Don't expect this speaker to work well in big rooms - although there's full baffle step compensation, there's a very real risk of smoking the woofers.
It all started when a friend asked me for a small minimonitor for his home. I initially thought of an RS28 / RS125 speaker. After running a couple of sims, it was obvious this was not going to work, since a single RS125 could not handle too much load. The speaker grew, as my friend's interest got smaller (due to the size of it).
The speaker itself isn't that big. But Bose and the like have made people think they can get awesome sound in a 3x3x3 package. Since I wasn't very interested in building a bad speaker in the name of size, I built this speaker to be used at my office. It still had to be built as small as possible, but not to the extreme.
From previous experience, a 4" driver isn't exactly a great idea if dynamics and maximum power are desired - especially dynamics. Then again, this is a speaker for smaller rooms - a 6" would make the enclosure too big, which defeats its purpose. The RS150 driver is a better deal than the RS125, IMHO- but this design really requires the smallest driver possible. As it is,the box may be a bit big for some rooms!
Bass alignment:
It was time to find out what size a pair of RS125's would be comfortable in. To my surprise, they needed less volume than a pair of W4-1370s, which was good. I tried to shoot for 11L, so the external size (considering 3/4" MDF) was 45 x 18 x 26 cms. This would give me an 11.72 liter volume, which I'd tune to 55 Hz for an F3 of 54.98 Hz. Nice.
I used a 2" P-E flared port I had around. At 12.5 cms, the size would not be a problem.
I can't complain about FR - considering the driver is more like a 4" one!
At 25 Watt, I can expect the driver to survive. I wouldn't want much more power than that, though. Don't expect this speaker to work well in big rooms - although there's full baffle step compensation, there's a very real risk of smoking the woofers.
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