So here is a crossover that I think will work for NEAR WALL PLACEMENT
A couple of points...
A couple of points...
- This is the same 4-component topology that Jeff Bagby used in his Quarks.
- The components on the tweeter differ because of differences in the tweeter and also because you plan on using it near a wall.
- The inductor on the woofer is the same, the box volume is the same, and the box tuning (from the 1" diameter by 4" long port) is the same. Thus, from about 600hz down is the same EXCEPT that you are using the speakers close to the wall.
- I filled the cabinet behind the woofer and below the port with polyfill. I grabbed a handful and put it in the cabinet but did not pack it in.
- The cabinet is pretty tiny, so I'd use small crossover components where possible. This speaker is NOT going to handle a lot of watts, so a 5 watt resistor should be fine. Jantzen air coil inductors are a little more expensive than Dayton Audio but they are smaller. I think you said you had a place local, so whatever you can get should be fine.
- Looking at the middle image, you will see the response is rising from about 500hz to 10khz (teal line in the middle image and red line in the bottom image). If you put this speaker out in a room, away from the wall it will not sound good. It will be too much upper midrange and high notes.
- However, if it is placed 2 to 3 inches from the wall on a mantle, the SPL curve will be more like the green line in the bottom figure.
- If the upper bass boost around 150hz to 200hz is too much near the wall, maybe add a little more stuffing or put some cotton balls in the port. If you crossover to a subwoofer at 100hz you should be fine.
You said you were going to put these on a mantle, near the wall, to the sides of your TV. If that is the case, the crossover above should work.
If you were going to put them 1-1/2 feet or more from the walls, here is a crossover that I think will work for AWAY from the WALL PLACEMENT.
If you were going to put them 1-1/2 feet or more from the walls, here is a crossover that I think will work for AWAY from the WALL PLACEMENT.
Depends.
But for the most part not a big deal.
Bookshelf speaker. So would assume
baffle step look a lot different than seen
so far.
rear port is common, might be issue though
if placed against a wall.
But for the most part not a big deal.
Bookshelf speaker. So would assume
baffle step look a lot different than seen
so far.
rear port is common, might be issue though
if placed against a wall.
Not in a way that matters for sound quality or anything. The component values will typically differ as a roll-off at 3khz (or wherever) requires a different capacitor for a 4ohm impedance vs 8ohm. The sensitivity difference between the DX20 and the Dayton ND20FA-6 in the Quarks would require a different resistor, although that's due to the difference in sensitivity regardless of the impedance (but a 4 ohm tweeter is usually going to have higher sensitivity than a 6 or 8 ohm tweeter).
It is indicated in the schematic above, but I want to point out that the tweeter is wired in reverse polarity.
That "looks" right to me. Just to make sure , I drew in some more detail. Remember the tweeter is wired in reverse polarity.
