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Old 21st June 2005, 06:56 PM   #31
agent.5 is offline agent.5  United States
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Just wondering what is the verdict? Will a 5-7W SET amp be enough to drive Visaton B200 on OB, assuming that the system is bi-amped (with active crossover) and Visaton will not be responsbile for frequency below 150hz?
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Old 22nd June 2005, 02:46 AM   #32
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It is all dependent on how loud... i wouldn't hesitate to use such an amp.

dave
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Old 22nd June 2005, 09:35 AM   #33
el`Ol is offline el`Ol  Germany
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Default Re: help me choose a wide range driver

Quote:
Originally posted by johnmark
My project is envisioned as follows;


Below 120hz I will use an active crossover to 2-10" woofers also on open baffle. The lowpass to woofers will be 24db and the highpass to the wide range will be 12db .


What can be used below 120Hz in OB
Would a Tymphony LAT in a Linkwitz or Attack Dipole work?


Oliver
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Old 22nd June 2005, 03:23 PM   #34
DeonC is offline DeonC  South Africa
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Default Thanks for the heads-up re. Bessel arrays

I was at times seriously considering a Bessel array, but imaging is somewaht important to me so that idea has been shelved. OTOH for an HT system where imaging capability is of lesser importance (thanks to the center channel speaker) Bessel arrays might still be worth it. IIRC Stryke has some $3 drive-units that will work nicely in a 5 X 5 element array.

Enjoy,
Deon
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Old 22nd June 2005, 09:40 PM   #35
Sjef is offline Sjef  Netherlands
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I'm using a Phy-Hp 8" wide range driver on an open baffle from 120HZ to 4kHz with 60db/oct fir crossovers. The Phy's are driven by a 9W 300B set amp and have a effiency of 93db (97db/1w/1m/16Ohms but only 93dB/2.83V/1m). Power of the 300B amp is just about enough, in fact I would like to see at least the double amount of power on them for better transient response at higher volumes. So I think the use off a 300B set amp with the visaton's in a similar configuration would not be such a god advice unless you only play at lower volumes.

In a setup like this forget about using anything smaller than 8", they all run out of steam very easily no matter how high the xmax is.
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Old 25th June 2005, 04:20 PM   #36
DeonC is offline DeonC  South Africa
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I recently looked at a few drivers that might just be what you are looking for. They are the Madison Knight 8, Archer 8 or Warrior 10 (the name corresponding to the size). The specs look like this:

Model Knight 8
FS 90hz
VAS (cu.ft) 0.15
SD 38.484
Qts 0.683
Qes 0.812
Qms 4.313
BL 47.57
Re 5.3
Nominal Ohms 8
Le 232.92u H
Mms 64
X max 0.25
X mech 0.5
SPL 95db
Freq.Res. 80-8000hz
Cone type treated paper
basket type cast aluminum
Magnet size 30oz.
Power RMS 200 watts
Power Peak 400 watts

Model Archer 8
FS 81hz
VAS 0.643
SD 38.484
Qts 0.97
Qes 1.08
Qms 8.91
BL 7.07
Re 5.81
Nominal Ohms 8
Le 242.38u H
Mms 18.31
X max 0.187
X mech 0.375
SPL 98db
Freq.Res. 80-8500hz
Cone type treated paper
basket type stamp
Magnet size 20oz.
Power RMS 100 watts
Power Peak 200 watts

Model Warrior 10
FS 65hz
VAS 0.555
SD 63.61
Qts 0.867
Qes 0.915
Qms 16.35
BL 13.84
Re 6.17
Nominal Ohms 8
Le 362.56uH
Mms 53.06
X max 0.25
X mech 0.5
SPL 99db
Freq.Res. 80-7000hz
Cone type paper
basket type stamp
Magnet size 50oz.
Power RMS 200 watts
Power Peak 400 watts

If I use Thorsten's XL Baffle, and I plot them on an open baffle with a width of 12" (300mm), and a height off the floor of 27.5" (700mm), then both the Archer 8 and Warrior 10 give more than 110dB down to 100Hz (this is for a single driver). In fact, they both are around 115dB down to about 300Hz, but the version of XLBaffle that I am using here (I am not on my home PC right now) is an older version of XLBaffle, and the newer version also takes into consideration the height of the baffle (this version does not). If height is added to the calculation (for say a baffle that is about 43" (1100mm) high) then the total SPL will probably be flat at around 115dB right down to 100Hz, which should be ideal for your use. Consider though that this is for the full power handling spec of the driver (which is 100W for the Archer 8, and 200W for the Warrior 10). Still not too bad though. You can then use your two 10" drivers to fill in the lower octaves. Just a thought.

Enjoy,
Deon

PS. The link to have a look at the specs for the Madison drivers is:
Madison drivers T/S parameters

Their website is:
Madison Speakers

PPS. Their quoted VAS specs seem to be odd. I am not sure in what unit it is. I multiplied it by 100 to get to liters, as that seems to fit the rest of the specs best.
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Old 26th June 2005, 05:14 AM   #37
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Default Re: Thanks for the heads-up re. Bessel arrays

Quote:
Originally posted by DeonC
I was at times seriously considering a Bessel array, but imaging is somewaht important to me so that idea has been shelved. OTOH for an HT system where imaging capability is of lesser importance (thanks to the center channel speaker) Bessel arrays might still be worth it. IIRC Stryke has some $3 drive-units that will work nicely in a 5 X 5 element array.

Enjoy,
Deon
For HT with a big image I highly recommend a pair of real line arrays, then you can play around with the bessel as a center channel and horizontal mounting.
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Old 26th June 2005, 07:45 AM   #38
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Default Re: Re: Thanks for the heads-up re. Bessel arrays

Quote:
Originally posted by johninCR
For HT with a big image I highly recommend a pair of real line arrays, then you can play around with the bessel as a center channel and horizontal mounting.
Keep in mind that for a bessel array you need to be listening in the far field for it to integrate and with the line arrays you want to be in the near field.

dave
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Old 26th June 2005, 08:39 AM   #39
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Default Re: Re: Re: Thanks for the heads-up re. Bessel arrays

Quote:
Originally posted by planet10


Keep in mind that for a bessel array you need to be listening in the far field for it to integrate and with the line arrays you want to be in the near field.

dave
I agree, but since you're talking about apples and oranges, it's pretty easy to be in both fields at the listening position. The bigger problem is the efficiency mismatch with the line arrays being much more sensitive.
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