• Re: RS 40-1354 Specs at last Paul Joppa 10:52:05 12/13/99 (4)
  In Reply to: Radio Shack 40-1354 Specs posted by ChristopherC on December 09, 1999 at 08:29:38:

  I took a few minutes this weekend to make some measurements. Please remember, these are initial results on a speaker straight from the box - some breakin will certainly reduce the suspension stiffness.

  RE = 7.09 ohm
  f0 = 56.0 Hz
  SD = 0.0083 m^2
  Mmc = 6.16 g
  QM = 3.46
  QE = 0.537
  QT = 0.46
  Vas = 0.013 m^3 = 0.457 ft^3
  eta (2 pi) = 0.414%
  Sensitivity 88.7dB/2.83v/m
  
  
  

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  • Re: RS 40-1354 Specs at last Craig Stenstrom 21:29:48 12/13/99 (2)
    In Reply to: Re: RS 40-1354 Specs at last posted by Paul Joppa on December 13, 1999 at 10:52:05:

    Thanks for doing the tests.

    So I get enclosure volume of .738 cubic feet and port length of 3.66 inches with a 2 inch diameter. Correct?

    Using

    Enclosure volume Vb = 15 * Vas * (Qts ^ 2.87)
    
    Tuning Frequency Fb = 0.42 * Fs * (Qts ^ -0.9)

    Lv = ((1.463 * (10 ^ 7) * (R ^ 2))/(Fb^2)*Vbi)-1.463 * R

    where Lv = length of the port
    R is radius of the port (diameter /2 ),
    Vbi is Vb in inches (cu ft * 1728)
    
    If you have two drivers in the box do you just multiply by two?
    
    

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    • Re: RS 40-1354 Specs at last Paul Joppa 11:19:34 12/14/99 (0)
      In Reply to: Re: RS 40-1354 Specs at last posted by Craig Stenstrom on December 13, 1999 at 21:29:48:

      That sounds about right. Two caveats though:

      1) I tested drivers right out of the box. With some breakin the stiffness of the suspension will drop, lowering resonance and Q (10%?)and raising Vab (20%?). Should give very similar results though.

      2) Used with no-feedback triode amps, the QE will increase due to the source impedance. Usually 30-50% increase results - see Eduardo deLima's articles in GA. That gives a much bigger box, but another 1/2 octave of bass. If you don't allow for this, the bass may be underdamped and boomy. I have no information on the excursion capability of these drivers, however - there's a limit to how much bass you want from a 6" woofer!
      
      

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    • Re: RS 40-1354 Specs at last Doc B. 09:12:45 12/14/99 (0)
      In Reply to: Re: RS 40-1354 Specs at last posted by Craig Stenstrom on December 13, 1999 at 21:29:48:

      For two drivers you just double the box volume and double the vent area. The vent length stays the same.
      
      

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  • Re: RS 40-1354 Specs at last Ed Faulkner 11:41:33 12/13/99 (0)
    In Reply to: Re: RS 40-1354 Specs at last posted by Paul Joppa on December 13, 1999 at 10:52:05:

    Thanks for the specs Paul...
    
    

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• Let me rain on the 1197 1354 parade. Edp 19:59:11 12/12/99 (1)
  In Reply to: Radio Shack 40-1354 Specs posted by ChristopherC on December 09, 1999 at 08:29:38:

  Well I picked up a pair of each of these last week, spent the weekend making/using existing simple test mule enclosures.

  I don't find these units to be all that special. The draw is that one does not need a xover as that "messes things up" and is more tube friendly. I personally find that these units still need contouring or they are just too squacky.

  The 1197 needs the midband suppressed or it is just too prominate (1200 to 2900). The simple enclosure listed on the Fostex site does little create bass and defraction/baffle step is there. So one is faced with placing a countour circuit in the signal path and out goes the notion of pure simple signal generator. It would be a fine midrange with a super tweeter, but with that seems to be at odds with the initial interest of full range tube friendly setup.

  I have not built a voight or tqwt setup, but my issues were not with the bass output as I was interested in understanding the midband potential. The treble was very suprisingly good and extended for a full range.

  The 1354 I have not spend much time with and will some more, but initially I find that the unit is not really able to to the extention needed in the treble region. I fear that special efforts on working on the whizzer might be needed to make the unit more full range. Then one is faced with pondering the need for a tweeter.

  I ain't really trashing the use of these, just read all the stuff, bought a couple, built a quick set, evaluated, put on the shelf. Not too much of a shame,since they are in some interesting company on that shelf with the rest of the "also rans" from Audax, AR, Scan Speak, Peerless and Vifa. The 1197 does have something, but the 1354 asks one to make too many comprimises to have it meet the design goals and still be considered a refined unit I fear.

  I will spend more time (sometime) in the future, but I either need to do alot more polishing , or these are not the diamond in the rough one might think from reading the web posts.
  
  

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  • Re: Let me rain on the 1197 1354 parade./check this tqwt 19:33:39 12/14/99 (0)
    In Reply to: Let me rain on the 1197 1354 parade. posted by Edp on December 12, 1999 at 19:59:11:

    nt...
    

    • TQWT- Speakers Asylum

    
    

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• Re: Radio Shack 40-1354 Specs Steve Hornsby 15:23:11 12/09/99 (2)
  In Reply to: Radio Shack 40-1354 Specs posted by ChristopherC on December 09, 1999 at 08:29:38:

  New to this really great site. Just ordered a Foreplay - can't wait!
  Radio Shack probably never knew they ran in such seasoned circles. On the topic of Radio Shack. An earlier entry on the 40-1354 mentioned the Vioght? Pipe project. I get the sense that the speaker was turned around, the eight inch hole plugged and a new one created for the 1354 on the slant side. Well - RS makes a full range 8". Two entries below the 8506 just mentioned on the Canadian site. Specs listed - 50-18,000Hz, 15 watts RMS and 30 max - $CDN34.99. Thats all the info listed - can't even tell if its paper or poly - looks poly. I seem to remember a paragraph in Valve that stated that paper rules over poly in this type of application. Anyone know of this driver? and if its poly would ya go near it?
  
  

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  • Re: Radio Shack 40-1354 Specs Groovy 07:58:10 12/10/99 (1)
    In Reply to: Re: Radio Shack 40-1354 Specs posted by Steve Hornsby on December 09, 1999 at 15:23:11:

    Dear dude,

    Went to RS to check it out and it's paper. Looks like the same magnet used in the 1197. I'm going to be in Washington state this weekend. I have afeel for what the 1197 can do, has anyone compared the 1354 to the 1197. Should I get a 1354?
    
    

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    • Re: Radio Shack 40-1354 Specs Stevo 08:29:06 12/10/99 (0)
      In Reply to: Re: Radio Shack 40-1354 Specs posted by Groovy on December 10, 1999 at 07:58:10:

      Thanks Groovy,

      I forgot to mention the product number for the 8" RS Full Range for any one else who is interested - 40-1286 in Canada.
      
      

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• Re: Radio Shack 40-1354 Specs Groovy 09:06:18 12/09/99 (7)
  In Reply to: Radio Shack 40-1354 Specs posted by ChristopherC on December 09, 1999 at 08:29:38:

  Dear Chris,

  I went to Radioshack to look at this speaker and it is a 4 ohm unit. The center whizzer cone is a hard plastic material. It looks okay. I can tell you that the 40-1197 (FE 103) works pretty neat in the little horn setup that I built. As a further note I filled all the empty cavities with sand and that relly tightened up the sound. Lot's of tweaking left to do here and it already sounds woth the $50 CDN I got sunk into it.
  
  

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  • Re: Radio Shack 40-1354 Specs ChristopherC 09:25:19 12/09/99 (6)
    In Reply to: Re: Radio Shack 40-1354 Specs posted by Groovy on December 09, 1999 at 09:06:18:

    Hello Groovy,
    I'll be getting the 40-1197 but I'll be waiting for their sale
    (talked to a salesperson-Jan or Feb sale?)...so if they have a real good sale pick I'll up the 40-8506 as well(if it's RS Canada version of 40-1154).
    Do you like the 40-1197 front loaded or is it better rear loaded
    with the corner re-enforcement?
    Keep us posted on your progress please!!!
    
    

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    • Re: Radio Shack 40-1354 Specs Greg Bianchini 10:05:23 12/09/99 (5)
      In Reply to: Re: Radio Shack 40-1354 Specs posted by ChristopherC on December 09, 1999 at 09:25:19:

      The rumour is that the Radio Shack 40-1354A has been discontinued. I picked up three at my local shack, and I plan on testing them this weekend if I have time. I'll post my results here if anyone is interested.
      
      

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      • Re: Radio Shack 40-1354 Specs Ed Faulkner 11:19:43 12/09/99 (4)
        In Reply to: Re: Radio Shack 40-1354 Specs posted by Greg Bianchini on December 09, 1999 at 10:05:23:

        I could use the T/S parameters, grabbed a couple of these the other day and did not get spec sheets.
        
        

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        • Re: Radio Shack 40-1354 Specs +Rumors End Herbert Jeschke 13:14:57 12/09/99 (3)
          In Reply to: Re: Radio Shack 40-1354 Specs posted by Ed Faulkner on December 09, 1999 at 11:19:43:

          Hi Everyone,
          Sorry I started the Rumor of the discontinued 40-1354.Read below, I posted this Nov 30. When I get home I'll have a close look at them and post whats written on their backside.
          Nov 30 posting:
          I am sure glad I made this posting, because of all the valuable information that was tapped into by this.
          I was had however by that overworked store clerk: the speaker is and will be still available as you can read below, a response e-mail from Radio Shack themselves:
          The speakers are still available through on-line, telephone order, and your
          local RadioShack store. This item is store-stocked and can be purchased
          either at your local store, by phone by contacting RadioShack.com at
          800-241-8742, or on-line at http://www.radioshack.com/ProductSupport/Frames/
          by entering the catalog number in the Cat#: field at the bottom left of the
          screen. You can locate your nearest RadioShack store at:
          http://tandy.know-where.com/RadioShack/
          For more product details, including specification, see this web page:
          http://support.tandy.com/support_auto/7023.htm

          Thank you for your inquiry, and please feel free to contact us if you
          have any further questions.

          And I thank you all, Herbert

          
          
          

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          • Re: Radio Shack 40-1354 Specs +Rumors End JOE_SWO 17:40:55 12/09/99 (2)
            In Reply to: Re: Radio Shack 40-1354 Specs +Rumors End posted by Herbert Jeschke on December 09, 1999 at 13:14:57:

            Herbert,

            I want to know if you are still using the 1354's in the Voigt Pipe? I'm thinking of making a speaker that can be driven by a S.E.T. amp and it sounds like RS speakers can be a good and cheap alternitive speaker.

            Thanks,
            Brad
            
            

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            • Re: Radio Shack 40-1354 Specs +Rumors End Herbert Jeschke 18:13:22 12/09/99 (1)
              In Reply to: Re: Radio Shack 40-1354 Specs +Rumors End posted by JOE_SWO on December 09, 1999 at 17:40:55:

              Hi Joe,
              Yeah I still have them in my Voigt Pipes. I did not get around to whistle them trough with a tonegenerator to check on base-response.
              The other day I thought I miss some base so I tuned all kinds of FM stations in with their spectrum of music and I felt quite good again.Then I played classical CDs with full orchestras and I think there is definetly more low frequency response than I would have exspected from that little thing.
              Thanks again to Valve mag and Hawai 5.0!

              Here is whats written on the rear, the 10 ounce magnet:
              Radio Shack
              Cat.No.40-1354A
              20W NOM
              40W Max
              8 Ohms
              TAIWAN
              06 A 99

              My speakers also had a spec-sheet in the box with a graph that shows considerable roll off below 200 Hertz Like 7 dB down at 100 Hertz
              and 13dB down at 50 Hertz
              50 Hertz is the free air resonance. The Voigt Pipes go down to 40 Hertz.
              It's worth to build! And you can always stick another driver in the Voigt pipe and review your experience.
              I'm building the Hawaii 5.0 for my daughter now. Of course I'm very curious
              how they compare.
              I'm half finished with a parafeed 811-10 design. Have only 1 1/4 watt available without distortion so far. The 1 1/4 watt sounded big on my Voigt Pipes, so there is hope for low power amps on it.
              Happy building!
              
              

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              • Re: Radio Shack 40-1354 T/S Specs Craig Stenstrom 18:57:28 12/11/99 (0)
                In Reply to: Re: Radio Shack 40-1354 Specs +Rumors End posted by Herbert Jeschke on December 09, 1999 at 18:13:22:

                OK, knowing that the speaker is down 7db at 100 hz and the Fs is 50 hz can anyone figure out the Qts and the Vas of the driver?
                
                

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