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Old 7th July 2016, 05:47 PM   #11
planet10 is offline planet10  Canada
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Philips AD 8080/m4
Sounds like you are describing an OB? Should be OK. The bigger you make it the lower they should go, but there will be an optimum size.

dave
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Old 7th July 2016, 05:51 PM   #12
sachu888 is offline sachu888  India
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Default Boston Acoustics HQ48002

I am also looking to suggestion for Boston Acoustics HQ48002. Earlier they used to come as Philips Hi Q International speakers, now BA has acquired Philips speakers here, so the name changed. I have posted here because TS looks similar to OP's drivers.

Someone posted TS parameters of HQ48002 on another Hifi forum.

Fs = 83.86 Hz
Re = 7.10 ohms[dc]
Le = 787.75 uH
Qes = 1.46
Qms = 6.12
Qt = 1.18
Mms = 9.70 grams
Rms = 0.834214 kg/s
Cms = 0.000371 m/N
Vas = 26.88 liters
Sd= 226.98 cm^2
Bl = 4.980546 Tm
Sensitivity(2.83V/1m) = 92.80 dB

My friend has ried them in 40 Lt front ported bass reflex enclosure. I think similar like 7910 enclosure, but bass was not upto the mark.

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Sachin
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Old 7th July 2016, 05:55 PM   #13
planet10 is offline planet10  Canada
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Quote:
Qt = 1.18
Vas = 26.88 liters
The Q on this is a bit lower. As big an aperiodic box as you can live with. You aren't going to get deep bass out of these with an Fs near 90.

They would work in an OB too, but would likely need bass help.

dave
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Old 7th July 2016, 05:55 PM   #14
Lohengrimas is offline Lohengrimas  Netherlands
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Maybe a transmission line in the vein of the TABAQ would be cool... Bjohannesen explicitly designed those around high q drivers (tang band) with not too much extension.
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Old 7th July 2016, 06:17 PM   #15
sachu888 is offline sachu888  India
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Thanks Dave. I think will looks for another driver then.

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Sachin

Last edited by sachu888; 7th July 2016 at 06:19 PM.
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Old 21st July 2016, 05:53 PM   #16
sachu888 is offline sachu888  India
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Hi Dave,
I recently got another 8" FR drivers. Someone has posted TS parameters on another forum.
Bolton 20BF22 8ohms 40W Fullrange
Thiele-Small parameters:

Fs = 58.93 Hz
Re = 7.70 ohms[dc]
Le = 352.98 uH
L2 = 469.44 uH
R2 = 3.77 ohms
Qt = 1.35
Qes = 1.68
Qms = 6.81
Mms = 13.70 grams
Rms = 0.745250 kg/s
Cms = 0.000532 m/N
Vas = 30.23 liters
Sd= 201.06 cm^2
Bl = 4.817540 Tm
ETA = 0.35 %
Lp(2.83V/1m) = 87.75 dB

Fm friend is using same drivers in Sealed 35Lt enclosure. He has posted a video here https://www.youtube.com/watch?v=3Ex9s_ZsP1k

Can you suggest me any good enclosure fr them.
PS: My drivers are 4 Ohms.

Regards
Sachin

Last edited by sachu888; 21st July 2016 at 05:58 PM.
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Old 21st July 2016, 06:47 PM   #17
planet10 is offline planet10  Canada
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Qt is > 1 which indicates an OB of some sort.

dave
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Old 21st July 2016, 06:56 PM   #18
sachu888 is offline sachu888  India
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Thanks Dave, can I put them in sealed design as space is concern for OB.

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Sachin
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Old 21st July 2016, 06:58 PM   #19
planet10 is offline planet10  Canada
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If you can't put them in an OB, an aperiodic box as large as you can live with is your best bet.

dave
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Old 21st July 2016, 07:02 PM   #20
Lohengrimas is offline Lohengrimas  Netherlands
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Quote:
Originally Posted by planet10 View Post
If you can't put them in an OB, an aperiodic box as large as you can live with is your best bet.

dave
Yes, that's why I was wondering if a TABAQ (WiBAQ?) enclosure would be suitable, since that is also designed for a high Qts/100+ Hz driver. Bjohannesen mentioned a 2:1 ratio for the lowest reach vs the rating of the driver, so something like a 47/48 Hz low end should be possible in a TABAQ-style enclosure with the 8080, if I read the docs right. Probably not, since I'm a n00b of the worst kind...
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