Which subwoofers would you like to see being tested? - Page 7 - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #61 of 269 Old 03-29-07, 04:00 PM Thread Starter
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Re: Which subwoofers would you like to see tested?

I will soon open a new thread about the upcoming measurement session. Though not every requested sub will be there, many interesting ones will. And of course we still have around month to go so anything can still happen...
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post #62 of 269 Old 03-29-07, 04:03 PM Thread Starter
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Re: Which subwoofers would you like to see tested?

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I'd imagine he will have some TC 2000 results fairly soon
I should have a lot more info regarding this tomorrow...
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post #63 of 269 Old 03-30-07, 01:20 AM
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Re: Which subwoofers would you like to see tested?

Excellent.


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post #64 of 269 Old 03-30-07, 08:00 AM
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Re: Which subwoofers would you like to see tested?

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I should have a lot more info regarding this tomorrow...
Well? Today is yesterday's tomorrow...

Sorry, I'm just (very) curious, because I've made one or two TC-2000 thingies myself...
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post #65 of 269 Old 03-30-07, 04:54 PM Thread Starter
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Re: Which subwoofers would you like to see tested?

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Well? Today is yesterday's tomorrow...

Sorry, I'm just (very) curious, because I've made one or two TC-2000 thingies myself...
Almost done, not quite yet though. Hopefully tomorrow is the day.
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post #66 of 269 Old 03-31-07, 05:24 PM Thread Starter
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Re: Which subwoofers would you like to see tested?

Okay, a little sneak peak to something that has been cooking for some time now. Not completely OT since this sub will be participating in my next measurement session.

Pic of the other end. Guess what the other end has??



In-room frequency response with mains. Some EQ in the upper bass range, but no L/T or similar. 11-13 Hz dip is room induced.



Just a quick SPL/THD test at 15 Hz (mic at LP). Nowhere near max output as one can see from the THD figure.



Lots of more to come in the near future.
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post #67 of 269 Old 03-31-07, 08:49 PM
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Re: Which subwoofers would you like to see tested?

AWWWWWWW-SUMMMMM!

Your room and that 16Hz mode looks almost perfect with the sub's roll off. (You cheated picking 15Hz for the THD graph)

When did you get the Sound Tech software?

Did you experiment with placement, or just stick it where you always have the sub?

What kind of wood? Looks like maple or alder. Looks excellent!

Is it passive?

What power plant?

How many cubes?

What material for the tube? Is it painted or other?

Stuffing?

Everyone knows that engineer geeks can't build stuff, so who helped you with the baffles?

Looking forward to all the info.

Bosso

Last edited by bossobass; 03-31-07 at 08:56 PM.
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post #68 of 269 Old 04-01-07, 11:17 AM
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Re: Which subwoofers would you like to see tested?

Interesting that the room doesn't create a lot of distortion at 15hz - I thought non close mic in room THD measurements down low were useless because the room itself will resonate and such. Guess not. Looking forward to the full gamut


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post #69 of 269 Old 04-01-07, 02:17 PM Thread Starter
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Re: Which subwoofers would you like to see tested?

Quote:
bossobass wrote: View Post
AWWWWWWW-SUMMMMM!

Your room and that 16Hz mode looks almost perfect with the sub's roll off. (You cheated picking 15Hz for the THD graph)

When did you get the Sound Tech software?

Did you experiment with placement, or just stick it where you always have the sub?

What kind of wood? Looks like maple or alder. Looks excellent!

Is it passive?

What power plant?

How many cubes?

What material for the tube? Is it painted or other?

Stuffing?

Everyone knows that engineer geeks can't build stuff, so who helped you with the baffles?

Looking forward to all the info.

Bosso
Whooah, a lot of questions considering how much info you have given from your own sub(s).

I will promise to open a new thread, but here are some basics before that.

2 TC-2000 15", opposed firing
5 cu ft / 140 L net
508mm ID, 12mm / 1/2" thick sonotube, lined with 1 1/2" eggcrate foam, covered in black felt
30mm end caps made out of heat-treated birch with a CNC machine
two 18mm inner end caps per end made out of HDF
total weight around 55kg / 120lbs
2.4 kW pro amp (drivers in series, amp bridged)
Behringer DCX2496
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post #70 of 269 Old 04-01-07, 02:18 PM Thread Starter
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Re: Which subwoofers would you like to see tested?

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Interesting that the room doesn't create a lot of distortion at 15hz - I thought non close mic in room THD measurements down low were useless because the room itself will resonate and such. Guess not. Looking forward to the full gamut
It is a problem IF the room resonates. Mine doesn't have problems at those levels.
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