Next project: 3-way with open baffle

[50 watt head]

Re: Next project: 3-way with open baffle

Why do you place the resistor in front of the x-over? It will change other values needed, but I'd put a resistor in series, and one across the terminals.

It's just another way to help shape the tweeter response/level. A series resistor before the filter is easy to simulate in PCD, and I've found that sometimes it helps eliminate the need for an Lpad.

[Soundslike]

Re: Next project: 3-way with open baffle

Wow Phil, barely enough time to catch your breath from the Gila Monsters and you're tackling another design. It looks like this one could be even more challenging. Can't wait to see how it turns out.

[50 watt head]

Re: Next project: 3-way with open baffle

It looks like this one could be even more challenging..

Yep, it's a 3-way design, so it'll be a challenge!

On the other hand, I can't help but think that other aspects of this project will be less complicated, due to the fact that the woofer can be dealt with separately from the mid/tweeter. The woofer will just be in a simple box, with a simple 2nd-order LP filter. Once that's taken care of, the prototyping could begin by grabbing a random piece of pine 1x8 out of the scrap pile and mounting the mid and tweeter on it. Adjusting driver offsets and alignments and acoustic centers suddenly became really easy And, when one baffle turns out to be a dud, I can grab another scrap and try another alignment. (All of this would be informed and guided by the simulations I've already done in PCD.)

It just occurred to me just now that this isn't *that* much different from a typical subwoofer and satellite design. What my idea has more or less turned out to be is much like what you would have if you had a subwoofer on each channel, crossed really high (~600 Hz), to a small box-less TM satellite.

Aesthetically, I'm thinking of finishing the bass bins in black, and using a really nice light-colored hardwood (e.g., quilted maple) for the TM baffles. That would look sharp! I won't have access to my tools for awhile, though, so actually making some sawdust on these will have to wait until later this summer :(

[Pete Schumacher]

Re: Next project: 3-way with open baffle

Yep, it's a 3-way design, so it'll be a challenge!

On the other hand, I can't help but think that other aspects of this project will be less complicated, due to the fact that the woofer can be dealt with separately from the mid/tweeter. The woofer will just be in a simple box, with a simple 2nd-order LP filter. Once that's taken care of, the prototyping could begin by grabbing a random piece of pine 1x8 out of the scrap pile and mounting the mid and tweeter on it. Adjusting driver offsets and alignments and acoustic centers suddenly became really easy And, when one baffle turns out to be a dud, I can grab another scrap and try another alignment. (All of this would be informed and guided by the simulations I've already done in PCD.)

It just occurred to me just now that this isn't *that* much different from a typical subwoofer and satellite design. What my idea has more or less turned out to be is much like what you would have if you had a subwoofer on each channel, crossed really high (~600 Hz), to a small box-less TM satellite.

Aesthetically, I'm thinking of finishing the bass bins in black, and using a really nice light-colored hardwood (e.g., quilted maple) for the TM baffles. That would look sharp! I won't have access to my tools for awhile, though, so actually making some sawdust on these will have to wait until later this summer :(

One suggestion . . . offset both mid and tweet on the baffle, and keep them aligned vertically. The 2" mid will benefit from the baffle offset, just like the tweet.

[50 watt head]

Re: Next project: 3-way with open baffle

One suggestion . . . offset both mid and tweet on the baffle, and keep them aligned vertically. The 2" mid will benefit from the baffle offset, just like the tweet.

Will do -- thanks!

[rpb]

Re: Next project: 3-way with open baffle

It's just another way to help shape the tweeter response/level. A series resistor before the filter is easy to simulate in PCD, and I've found that sometimes it helps eliminate the need for an Lpad.

The L-pad may make it easier to shape the lower end of the midrange response. I don't like a sharp knee in a response.