Radio Shack 40-1197 (aka FE103) - Page 3 - diyAudio
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Old 12th May 2004, 01:20 AM   #21
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Quote:
Originally posted by gmilitano
With regards to the stuffing on the proto-1197-ml-tl, there are no details regarding stuffing.
0.36 lbs

Quote:
does using two drivers increase the efficiency?
Sort of

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You also mentioned that the height of the enclosure is critical. How is this height determined? Is it based on experimentation, or can software be used to model the enclosure. I have been playing with speaker workshop .. is this approprite or do I need something different?
GM (the other one) simmed that box using Martin Kings sw. The driver distance from the end of the pipe is critical because that is what causes the cabceling of the 1st ripple.

dave
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Old 12th May 2004, 01:20 AM   #22
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Quote:
Originally posted by Timn8ter
The old blue box 1197s were of 90db efficiency, the newer ones are less. Two drivers in parallel are usually calculated as having a +6db increase.
I see Tim, that you are still in the grasp of that myth... 2 drivers gives 3 dB.

Differences in amp power due to change in impedance, may (but rarely) give you another 3 dB of volume.

dave
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Old 12th May 2004, 02:30 AM   #23
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Quote:
Originally posted by planet10


I see Tim, that you are still in the grasp of that myth... 2 drivers gives 3 dB.

Differences in amp power due to change in impedance, may (but rarely) give you another 3 dB of volume.

dave
Thanks Dave. The education continues.
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Old 12th May 2004, 04:14 PM   #24
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Default Re: Extended Range Drivers

Quote:
Originally posted by gmilitano
Does anyone have any experience with the PE Pioneer extended range driver?

http://www.partsexpress.com/pe/pshow...number=269-568

How would this driver compare to the 1197. Based on the vauge 1197 specs, the pioneer seems to have a higer resonant frequency and a lower efficiency.

Any comments ... nice price on the pioneer driver.
Not even close. Here's the FR on a raw 1197.
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Old 12th May 2004, 05:03 PM   #25
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Default Re: Re: Extended Range Drivers

Quote:
Originally posted by Timn8ter


Not even close. Here's the FR on a raw 1197.
Wow, the 1197 is much much nicer! I guess you do get what you pay for.

Did you measure that response yourself?

When using the 1197, do you typically low pass at 9k to avoid that peak between 9 and 14kHz

Cheers,
GM.
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Old 12th May 2004, 05:23 PM   #26
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Default Re: Re: Re: Extended Range Drivers

Quote:
Originally posted by gmilitano
When using the 1197, do you typically low pass at 9k to avoid that peak between 9 and 14kHz
Be intesting to see if a tweaked driver has that peak ... at any rate it is only there on axis... if you don't point the privers directly at your head, it isn't going to be s big problem.

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Old 12th May 2004, 06:11 PM   #27
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Default Re: Re: Re: Re: Extended Range Drivers

Quote:
Originally posted by Timn8ter

That graph is from the Single Driver Website and is an untreated driver. Better response is possible by treating the cone, damping the frame and using a phase plug.
Ok, this is getting more complicated than I thought.

How do you "treat" a cone? Do you mean something like waterproofing?

Is damping the frame is using that sealant (ductseal) that Dave mentioned.

What is a phase plug?

I hope I am not annoying you fellows.
GM.
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Old 12th May 2004, 06:20 PM   #28
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A phaseplug is a extension of the pole piece that sticks out instead of a dust cap. It is ususally cone shaped but not always. It can be made of rubber, metal, or wood, etc.. and is used to shape the response of a driver on and off axis.
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Old 12th May 2004, 06:20 PM   #29
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Should we start a thread about the venerable 40-1197?
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Old 12th May 2004, 08:09 PM   #30
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Default RS 40-1197 discussion

I thought I should start a thread about this driver as an off shoot of the Tangband W3-871S thread. There were some questions presented that were off topic for that thread. I hope Planet10 kicks in with some info too as he has a fair amount of experience with this driver. This is the other thread:
TangBand W3-871S
Many users of the 1197 have used Dammar thinned with turpentine to treat the paper cone. Other treatments mentioned have been "puzzlecoat" or Weldbond thinned with water. The frame is stamped and can cause resonance so a minimum of some modeling clay on the frame just above the magnet helps. Some brave souls have placed felt on the inside of the basket legs. Removing the dust cap and installing a phase plug can help HF response.
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