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Old 19th January 2012, 08:17 PM   #1
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Default Philips 9710am08

long time ago i came accross tqwt drawing and i lovend THE simple design.
I also did some reading about THE Philips 9710. Then i stumbled upon set of these and bought them.

As nooby i have few questions:

Eh can i build good tqwt with this driver? I know its bit stupid to first buy and ask questionnaire later...
Is there someone who has build them Already because all i see is builds with Fostex etc.
What kind of amplifier do i need (to build)

In THE meanwhile i am very Bush with my chipamp....
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Old 20th January 2012, 12:11 PM   #2
IG81 is offline IG81  Canada
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9710 sounds good for a TQWT I'd say. This driver usually wants rather large enclosures though; my guess is you're probably looking upwards of 100 liters for a TQWT.

Almost any type of amplifier should do well on 9710; I've tried mine on both SS and 6BQ5 PP, with good results. It has a very even impedance curve that should make it quite easy to drive. *Edit - I just remembered that the version with the "AM" suffix indicates 800 ohmn impedance. If that's the one you have, maybe the best application for this would then be an OTL tube amp.*

You could use Hornresp to simulate such an enclosure. It's free and not too hard to learn, give it a try! Good luck!

IG

Last edited by IG81; 20th January 2012 at 12:17 PM.
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Old 23rd January 2012, 06:50 AM   #3
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Quote:
Originally Posted by Xerxes75 View Post
long time ago i came accross tqwt drawing and i lovend THE simple design.
I also did some reading about THE Philips 9710. Then i stumbled upon set of these and bought them.

As nooby i have few questions:

Eh can i build good tqwt with this driver? I know its bit stupid to first buy and ask questionnaire later...
Is there someone who has build them Already because all i see is builds with Fostex etc.
What kind of amplifier do i need (to build)

In THE meanwhile i am very Bush with my chipamp....
perhaps you should check this website to find our what your actually bought, Index of /radio/speakers
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Old 23rd January 2012, 11:46 AM   #4
bjorno is offline bjorno  Sweden
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[QUOTE=Xerxes75;2869794]
Quote:
..Eh can i build good tqwt with this driver? I know its bit stupid to first buy..
Hi, One of many possible suggestions: The submitted picture:

Quote:
..In THE meanwhile i am very Bush with my chipamp....
IMO: Perfect to power the drivers as the x-max is low.

b
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File Type: jpg Philips 9710M01_TQWT.JPG (519.4 KB, 114 views)
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Old 23rd January 2012, 12:26 PM   #5
IG81 is offline IG81  Canada
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bjorno, is that design yours and was it ever built?

IG
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Old 23rd January 2012, 12:48 PM   #6
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by IG81 View Post
bjorno, is that design yours and was it ever built?

IG
Hi,

Yes, In the mid sixties to late seventies I've built many different enclosures for this driver, all using volumes in between 50 -120 L but you have to be aware of that the T/S parameters might be aged especially for already used drivers.
For the shown design I just picked a set of parameters I've recently been using.

b
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Old 23rd January 2012, 09:08 PM   #7
IG81 is offline IG81  Canada
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Quote:
Originally Posted by bjorno View Post
Hi,

Yes, In the mid sixties to late seventies I've built many different enclosures for this driver, all using volumes in between 50 -120 L but you have to be aware of that the T/S parameters might be aged especially for already used drivers.
For the shown design I just picked a set of parameters I've recently been using.

b
I don't know what the original parameters really were, but the T/S I measured for my ceramic-magnet pair is pretty much on par with what Troels Gravessen and many others measured.

They pretty much seem to always want large enclosures; strange that the Philips recommended bass-reflex was a mere 40 liters!

IG
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Old 23rd January 2012, 09:29 PM   #8
hm is offline hm  Europe
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Hello,
with such a stroke a horn would be a best solution for the Philips,
the data doesnt show that, but it would work in BLH sat horns
without using the bass, or double horns as the front driver.
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Old 23rd January 2012, 10:15 PM   #9
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Mmh lots to read and to try....having Already this is going to be great project. But totaly against my nature i first going to finish my chipamp... There where some questions there and the anwsers have giving me lost to think about. But thats part of THE fun.
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Old 23rd January 2012, 11:30 PM   #10
IG81 is offline IG81  Canada
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Quote:
Originally Posted by Xerxes75 View Post
Mmh lots to read and to try....having Already this is going to be great project. But totaly against my nature i first going to finish my chipamp... There where some questions there and the anwsers have giving me lost to think about. But thats part of THE fun.
Did you figure out if you have the 800ohm version after all?

IG
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