What enclosure for those subs?

Status
Not open for further replies.
Jump to Latest
#201
High aspect ratio slot port?
I don't really need lots of power below 30hz, but ofcourse it's fun sometimes to show off with some really deep bass like none of my friends have heard before.
So, you think the new SDX10 will play music nicely in a 50l 25hz box?
 
#210
Take the port you have modeled (and model a fairly long one -- i usually try to get it close to one of the dimensions), and then take the cross-section of the port and change it to a rectangle... if you can get it as wide as the side that the vent fires out of and then as short a height as needed to fit the calculated xSection. For a woofer you probably want to keep it at least 2 cm high. You can add vent spacers to reduce the width if it is too long to fit the depth of the box without making it into an L.

An example attached

dave
 

Attachments

  • sprow-pp-extremis-vA1.gif
    sprow-pp-extremis-vA1.gif
    35.8 KB · Views: 150
#211
Well, i guess i will have to make it an L to be able to get the port to get to the front. The box will be max 40cm deep. Or wait... If i mount the woofer on the side i can still have the slot port at the front of the box.

While checking in WinISD i can have a port that is 250x30x604mm.
How wide does the box have to be to be able to fit a SDX10? Should the driver be placed as low as possible or as close to the Mar-Kel70 as possible?
One of the boxes will be placed in a corner and the other next to a door, anything i can do to even out the boost?
 
#213
planet10 said:
In a room, you will have a peak at the bottom of its passband.
Click to expand...

The question is where?

For example, mine's around 12 Hz, so is down where it doesn't matter even if it causes a technically under-damped alignment due to how we hear.

It can matter though if the peak is strong enough to resonate such things as TT tonearms, a problem I 'chased' for quite awhile since I had nothing that could measure it, ergo couldn't figure out for sure what was causing it until in desperation I moved the TT around the room until I found a large enough null along a side wall. Even then, I had to 'borrow' one of the wife's macrame' plant slings to suspend it from the ceiling...........

Rooms, ugh! I'm way past ready for the elastic bio-dome 'home of tomorrow' that was prophesied by the 21st century!

GM
 
#214
Rullknufs said:
How wide does the box have to be to be able to fit a SDX10?

Should the driver be placed as low as possible or as close to the Mar-Kel70 as possible?

One of the boxes will be placed in a corner and the other next to a door, anything i can do to even out the boost?
Click to expand...

Don't know, look it up on the CSS site.

Ideally you want drivers to be < 1/3 WL apart (Pi is what I use) at the XO's -12 dB point to sum ~ as one large point source. For example, you use an 80 Hz/2nd order XO:

Since each order is a 6 dB octave increase in slope roll off, 2nd order is rolling off at 12 dB/octave, making the -12 dB point one octave away at 160 Hz. < 1/3 WL of 160 Hz then is ~34,400 cm/sec/160/pi = ~68.44 cm apart.

In this case, the (sub)woofer can be down at the floor for max boundary gain loading and the mids/HF can be up at ear height without sounding as two separate sound sources.

One really needs to measure these two different speaker locations at the listening position (Lp) since the doorway is acting as a large reflex port that is only 'active' over 'x' BW.

IME, a doubling of 'subs' by the door plus an acoustically large enough vertical baffle (narrow 'wall' extension gasketed to the room's wall) to make the mids/HF 'feel' a corner has worked well enough. That, or mass quantities of EQ to even them out with the obvious loss of system efficiency/dynamic headroom.

GM
 
#215
Don't know, look it up on the CSS site.
Click to expand...
Seems to be atleast 154mm to be able to fit the driver. 170mm when flush-mounted. So i guess it has to be around 200mm wide?
Making the box 81x20x31.1 inside dimensions gives 50l. Having the box just 35.6cm deep (including 22mm material thickness) makes it possible to get a slot port at the front.
Ideally you want drivers to be < 1/3 WL apart (Pi is what I use) at the XO's -12 dB point to sum ~ as one large point source. For example, you use an 80 Hz/2nd order XO:

Since each order is a 6 dB octave increase in slope roll off, 2nd order is rolling off at 12 dB/octave, making the -12 dB point one octave away at 160 Hz. < 1/3 WL of 160 Hz then is ~34,400 cm/sec/160/pi = ~68.44 cm apart.

In this case, the (sub)woofer can be down at the floor for max boundary gain loading and the mids/HF can be up at ear height without sounding as two separate sound sources.So, you recommend placing it as close to the floor as possible?
Click to expand...

One really needs to measure these two different speaker locations at the listening position (Lp) since the doorway is acting as a large reflex port that is only 'active' over 'x' BW.
Click to expand...
Only "active" over "x" BW?

IME, a doubling of 'subs' by the door plus an acoustically large enough vertical baffle (narrow 'wall' extension gasketed to the room's wall) to make the mids/HF 'feel' a corner has worked well enough. That, or mass quantities of EQ to even them out with the obvious loss of system efficiency/dynamic headroom.
Click to expand...
So i will have to make a wall in my room? That will be impossible :S
 
#217
Status
Not open for further replies.
Top Bottom