Bought these pretty but not so hi-fi full rangers online, they came out of an almost unused stereo cabinet and are in good shape. Range is 75-18k hz., no T/S parameters given in the original literature.
Looking for fun builds/suggestions, so if you've build something with these fullrangers, please let me know! I'm not expecting these to offer earth-shattering performance over what I have now, so I might just go for something like an interesting omnidirectional concept.
I'm also mulling an "akoestische box A5" as it is called in the original Philips build plans. The 8080 is not mentioned as a recommended driver for this box (a tallish, square column, no ports), but the famous 9710 is; maybe I could just build the boxes and hope for a pair of 9710's to show up.
IMG_6070 by ctjr
IMG_6071 by ctjr, on Flickr
Looking for fun builds/suggestions, so if you've build something with these fullrangers, please let me know! I'm not expecting these to offer earth-shattering performance over what I have now, so I might just go for something like an interesting omnidirectional concept.
I'm also mulling an "akoestische box A5" as it is called in the original Philips build plans. The 8080 is not mentioned as a recommended driver for this box (a tallish, square column, no ports), but the famous 9710 is; maybe I could just build the boxes and hope for a pair of 9710's to show up.
IMG_6070 by ctjrIMG_6071 by ctjr, on FlickrHi,
I used them in tqwp about 1.1 high (folded ie the pipe was longer; probably 1.8). The mouth was about 9x22cm. I liked them very much with a decaware zen clone. Maybe not very hifi but very charming and envolving. They had lots of presence with not too demanding music.
I used them in tqwp about 1.1 high (folded ie the pipe was longer; probably 1.8). The mouth was about 9x22cm. I liked them very much with a decaware zen clone. Maybe not very hifi but very charming and envolving. They had lots of presence with not too demanding music.
Great, thanks. I figured as much re the open baffles, but since I've sacrificed a lot of real estate already for a pair of open baffles, I don't think I can get away with another pair 🙂
I also have a slightly newer pair from the same line, the 8082s. They indeed have a pretty weak magnet and thus high QTS. One possibility for them is an aperiodic box.
Also, sent you a PM concerning the 9710s.
Also, sent you a PM concerning the 9710s.
Figuring I could do foldaways (as per the Philips handbook anyway), what size would I be looking at?
the original philips manual suggests a flat, slightly trapezoid board with a kind of threstle-like back legs with hinges as support, so the whole shebang folds flat.
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
dave
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.
Regards
Sachin
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.
Regards
Sachin
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
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.
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
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
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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
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...