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combining two same full-range:does the low-range increase?
combining two same full-range:does the low-range increase?
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Old 20th February 2018, 11:11 PM   #41
norman bates is offline norman bates  United States
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I'm trying to run woofers with the full range driver setup.

But not many 12-15's have a flat Impedance that will play well with a simple inductor.

I run my avatar wide open with the receiver rolling my 15's at 200hz at unknown steepness. My midbass needs needs a higher rollover point for the woofers.
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Old 21st February 2018, 03:34 AM   #42
ewollowe is offline ewollowe  Australia
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Chrisb, Planet10 I've done a castle too with some 3" tang bands but without an angled top. What are the benefits to the angle?
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Old 21st February 2018, 09:23 AM   #43
midrange is offline midrange  United Kingdom
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combining two same full-range:does the low-range increase?
To answer the original question, which seemed to be 2 full range drivers run full range. The following figures should be fairly self explanatory. Using the Monacor sph 135 AD midbass speaker which I know.

If the box is 4.9 litres with a single speaker the system Q would be 0.9, the box resonance would be 100Hz and the bass -3dB would be at 82Hz.

For 2 speakers in the same box the system Q would be 1.25, the box resonance 135Hz and the -3dB 98Hz

So you get LESS low bass with 2 drivers, and a bigger hump in output centred at the box resonance.

The sp 205 has a high 100Hz resonance, and allegedly a very high Q to start with. This means that this affect will be very pronounced.
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Old 21st February 2018, 12:27 PM   #44
hm is offline hm  Europe
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someone tested it:
HiFi als Hobby: Mal wieder einen Breitbander ausprobiert - Monacor SP-205/8
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Old 21st February 2018, 03:46 PM   #45
midrange is offline midrange  United Kingdom
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combining two same full-range:does the low-range increase?
My response No 43 is talking about a closed box. Other types of box will be different. For instance with an open baffle, a 2nd driver would not have a lot of affect on the bass response (both run full range).
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Old 21st February 2018, 03:59 PM   #46
planet10 is offline planet10  Canada
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combining two same full-range:does the low-range increase?
Quote:
Originally Posted by midrange View Post
For 2 speakers in the same box...
No point in using the same box, you really need to "double" it.

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Old 21st February 2018, 04:09 PM   #47
hm is offline hm  Europe
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Hello,
no problem, but the driver has a Qts ~ 2,7, so if you get selected matched driver and 18 dB under 200 Hz, you might get a cheap solution with an aktiv sub below 130 Hz.
But an 8" for over 200 Hz is imho to large, take a good 5"FR and extra bass.
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Old 21st February 2018, 04:16 PM   #48
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by midrange View Post
My response No 43 is talking about a closed box. Other types of box will be different. For instance with an open baffle, a 2nd driver would not have a lot of affect on the bass response (both run full range).
Am I misunderstanding you? Multiple woofers are used in open baffle to get more bass output
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Old 21st February 2018, 07:22 PM   #49
midrange is offline midrange  United Kingdom
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combining two same full-range:does the low-range increase?
The question was 2 Monacor sp 205 with an Fs of 100Hz. I think with both run FULLRANGE on the same size baffle as one, the bass is not increased in relation to the midband+treble.
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Old 23rd February 2018, 12:52 PM   #50
jimbro is offline jimbro  United States
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Quote:
Originally Posted by ewollowe View Post
Chrisb, Planet10 I've done a castle too with some 3" tang bands but without an angled top. What are the benefits to the angle?
I waited awhile to see if chrisb or planet10 would answer but I guess they missed your question so my thought is that it lengthens the distance to the ceiling delaying the reflection a bit. Front or back tilt may depend on your room size, ceiling height and listening distance. For me with my small room and ~8ft listening distance a back tilt worked best with the speakers about 2ft from the Front wall. I built 4 small sealed boxes for chr70's and tried several different orientations.

Last edited by jimbro; 23rd February 2018 at 01:07 PM. Reason: clarity
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