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Old 11th January 2011, 11:30 PM   #101
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Quote:
Originally Posted by Don Snyder View Post
Poseydon - It would work (see pic) but not nearly as well. X-max is only 8 mm for the BMS, while the LAB 12 is 12 mm.
Kepp in mind that both manufacturers use different xmax-values in the spec sheet. Eminence measures with a klippel, BMS states the geometrical value. So the "measured" xmax on the BMS is much higher (or the geometrical xmax of the LAB is much lower, works eather way)
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Old 12th January 2011, 05:57 AM   #102
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Thanks a lot guys!
It is obvious that the simulation with the BMS is not as good as the LAB12 and probably I am going to give up the idea. I was looking for a multi-purpose solution speaking of subwoofers /usable frequency 20-150hz/ but unfortunately there is none.

Here is what i would like to accomplish:
1. Front Stereo Channels should be a combination of fast, dynamic and detailed bass response. Probably a good idea is to build 2 subs like MTH-30 or something like it. Lower usable frequency >= 45hz.
2. Subwoofer channel speaker should go deep down to 20-25hz. Probably only one sub.

So the separation should look like this way:
20-40/45hz - subwoofer channel
45-150 - front stereo channels.

Speakers available here in Bulgaria:
Most of the BMS speakers
All Visaton Speakers
Some of the Eminence Speakers

Thanks a lot.
Greetings!
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Old 12th January 2011, 10:25 AM   #103
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by poseydon View Post
I am going to give up the idea. I was looking for a multi-purpose solution speaking of subwoofers /usable frequency 20-150hz/ but unfortunately there is none.
A very large corner loaded horn could give you three octaves.
A tapped horn that is considerably smaller is unlikely to get more than two octaves.
Two or three 18inch drivers could get to three octaves, but either box volume gets very big or power goes through the roof.
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Old 12th January 2011, 11:27 AM   #104
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AndrewT, I understand your idea but unfortunately the room is not big enough.
I have two free corners in which I can place 250*40*40 cm box.
If I use a single folded design /tapped horn?/ with 12" speaker probably I will get down to 25hz?

Probably my questions is not placed in the correct thread...Sorry for that!
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Old 12th January 2011, 12:32 PM   #105
AndrewT is offline AndrewT  Scotland
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Hi,
if the 12inch is the eminence driver and you build a tapped horn then you are in the correct thread.

If you set your TH to achieve 25Hz then expect ~100Hz as a reasonable maximum frequency.
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Old 12th January 2011, 01:13 PM   #106
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by poseydon View Post
...I was looking for a multi-purpose solution speaking of subwoofers /usable frequency 20-150hz/ but unfortunately there is none...Here is what i would like to accomplish:
1. Front Stereo Channels should be a combination of fast, dynamic and detailed bass response. Probably a good idea is to build 2 subs like MTH-30 or something like it. Lower usable frequency >= 45hz.
2. Subwoofer channel speaker should go deep down to 20-25hz. Probably only one sub...So the separation should look like this way:..20-40/45hz - subwoofer channel...45-150 - front stereo channels...Speakers available here in Bulgaria:..Most of the BMS speakers..!
Hi, If you consider the MTH-30 using the BMS-12S330, you're leaving, IMO, Hi-Fi SQ for live PA Mid sound colorations/artifacts. See a simulated example using this driver in a system capable of THX levels and superior SQ:

b
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File Type: jpg Dual_BMS12S330_T-TQWT+closed-Mid.JPG (488.4 KB, 1000 views)
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Old 12th January 2011, 01:30 PM   #107
AndrewT is offline AndrewT  Scotland
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Hi B,
I'm confused.
Which column of reports belong to which arrangement?
I see Tapped Horn and T-TQWT and sealed box.
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Last edited by AndrewT; 12th January 2011 at 01:35 PM.
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Old 12th January 2011, 01:38 PM   #108
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by AndrewT View Post
Hi B,
which column of reports belong to which arrangement?
I see Tapped Horn and T-TQWT and sealed box
Hi Andrew,

The first vertical column concerns a T-TQWT-sub and the second to a closed mid-bass box: suggested to be a part of a main speaker system.

b
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Old 12th January 2011, 02:03 PM   #109
AndrewT is offline AndrewT  Scotland
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Then,
why does the TQ show 290W (effic~0.3%) for 30.98V input,
but the sealed shows 9W (effic~2%) for 30.98V input?
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Old 12th January 2011, 04:06 PM   #110
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by AndrewT View Post
Then,
why does the TQ show 290W (effic~0.3%) for 30.98V input,
but the sealed shows 9W (effic~2%) for 30.98V input?
The efficiency depends on the different specific system load impedance given as a function of the frequency in use : See the picture for more comparisons.

b
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File Type: jpg Efficiency-comp.JPG (195.6 KB, 930 views)
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