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  1. #271
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    Quote Originally Posted by Dennis Gardner
    Passive radiators are just passive...............they are acting as a tuned port. They have no voice coil or magnet to power and simply move in and out from the pressure of the mid woofers. Pull one out of the cabinet and you will be surprised how simple they are. It is just a basket, a plywood board and woofer surround.

    The bottom binding posts are mid woofer posts.
    Thanks Dennis.:)

  2. #272
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    Quote Originally Posted by hearingimpared
    Very cool. One day I would like to tri amp my 1.2 TLs. I am currently going to biamp them but I just haven't decided what amp I want to use on the high freq. I also asked a question is the threads about using a crossover between my pre and amp. I got mixed opinions. Please let me know how you make out with yours.
    I was finally able to try the new active crossover on the weekend and I will say that it is big improvement over the passive one it replaces.

    If you wanted to add an active crossover between preamp and amp you would need to remove the passive one built into the speaker.But there is a good chance the change will not be for the better.There are several factors that are involved in doing this that must be considered if it is to be an improvement.If done correctly some big improvements can be expected.
    Last edited by GV#27; 11-13-2006 at 08:07 PM.

  3. #273
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    Quote Originally Posted by GV#27
    I was finally able to try the new active crossover on the weekend and I will say that it is big improvement over the passive one it replaces.

    If you wanted to add an active crossover between preamp and amp you would need to remove the passive one built into the speaker.But there is a good chance the change will not be for the better.There are several factors that are involved in doing this that must be considered if it is to be an improvement.If done correctly some big improvements can be expected.
    I'm glad to hear you were able to improve your system DIY STYLE!!!.

    I, however, am confused, how is an active crossover between my Spectral preamp and my two Adcom mono blocks seen by the 1.2 TL's passive crossover?

  4. #274
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    Quote Originally Posted by hearingimpared
    I'm glad to hear you were able to improve your system DIY STYLE!!!.

    I, however, am confused, how is an active crossover between my Spectral preamp and my two Adcom mono blocks seen by the 1.2 TL's passive crossover?
    Thanks.

    Thought that this article would be able to explain it better than I could.
    Hope this is helpful.
    http://sound.westhost.com/biamp-vs-passive.htm

  5. #275
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    Quote Originally Posted by GV#27
    Thanks.

    Thought that this article would be able to explain it better than I could.
    Hope this is helpful.
    http://sound.westhost.com/biamp-vs-passive.htm
    Wow I already read that about a month ago. Come to think of it I think you turned me onto the site.

    I better read it again.:o

  6. #276
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    Yes it is a bit technical but informative.

    Basically you use either a passive or an active crossover but not both.The speaker with a passive network should get a full range signal from the amp so that it can do its job of dividing the bass from the treble.
    Then it routes the bass to the woofers and the treble to the tweeters.If you put an active unit between the preamp and amp it does the frequency dividing before it gets to the amp and speaker.If a passive network is still in the speaker than you will get some unpredictable frequency response errors.
    Last edited by GV#27; 11-13-2006 at 10:20 PM.

  7. #277
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    Quote Originally Posted by GV#27
    Yes it is a bit technical but informative.

    Basically you use either a passive or an active crossover but not both.The speaker with a passive network should get a full range signal from the amp so that it can do its job of dividing the bass from the treble.
    Then it routes the bass to the woofers and the treble to the tweeters.If you put an active unit between the preamp and amp it does the frequency dividing before it gets to the amp and speaker.If a passive network is still in the speaker than you will get some unpredictable frequency response errors.
    Gottcha, I do remember reading about that, I just printed the article again to peruse before bed tonight.

    Thanks for all the information.
    Joe:) :)

  8. #278
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    You are very welcome Joe.

  9. #279

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    Ain't seen any guts in a while.

  10. #280

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    Well, hasn't been much on the slab lately at Casa Hardy, but I did clean the pots on a couple of little Sherwoods Sunday.

    Two pictures of an early/mid 1970's S-7200 receiver. The SS Sherwoods are considered "sleepers" in some circles: demand and price is low, sound quality is good. The FM tuners were especially good. Sherwood built top quality tuners for many, many years, starting as "Radio Craftsmen" in the early 1950's (or even before?).

    The other photo is a later (ca. 1980??) Sherwood S-702 CP ("certified performance") integrated amp. These were apparently made in Korea by Inkel (according to AK member "Nakdoc").
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    all the best,
    mrh

  11. #281

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    For comparison, and FWIW, here is a very old Radio Craftsmen AM/FM tuner. I thought I'd posted this semi-nude in this thread already, but danged if I can find it...

    all the best,
    mrh

  12. #282

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    Marchand XM44 active crossover for my Innersound Eros MKII speakers. The first design Innersound bass amp/active crossover only had one knob to control bass/mids. The XM44 has seperate low and high controls for my bass amp and panel amp, with a 5dB mids boost control in the 5Hz to 2KHz range allowing me unlimited, picky bastage flexibility.
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    Last edited by SCompRacer; 11-28-2006 at 02:19 PM.
    Make yourself necessary to someone. Ralph Waldo Emerson

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  13. #283

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    I'll be stealing my gf's or 'rents digital camera to post some pics, hopefully of my HK 635, both B&K late 80's gear, and maybe even one of my carver tfm-6cb (love those little guys, so damn versatile).

    All this green I drop on audio gear, and I can't drop $250 on a camera. . . just seems silly.
    Stereo Rig: Hales Revelation 3, Musical Fidelity CD-Pre 24, Forte Model 3 amp, Lexicon RT-10 SACD, MMF-5 w/speedbox, Forte Model 2 Phono Pre, Cardas Crosslink, APC H15, URC MX-950, Lovan Stand
    Bedroom: Samsung HPR-4252, Toshiba HD-A2, HK 3480, Signal Cable, AQ speaker cable, Totem Dreamcatchers, SVS PB10-NSD, URC MX-850

  14. #284

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    Good stuff!:)

  15. #285
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    Quote Originally Posted by SCompRacer
    Marchand XM44 active crossover for my Innersound Eros MKII speakers. The first design Innersound bass amp/active crossover only had one knob to control bass/mids. The XM44 has seperate low and high controls for my bass amp and panel amp, with a 5dB mids boost control in the 5Hz to 2KHz range allowing me unlimited, picky bastage flexibility.
    I like that xm44.Nice neat layout on the PC boards and by the look of it ,it uses stepped attenuators for level control instead of pots which is a nice touch.

  16. #286

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    CJ PV-7 Tube Pre-Amp....look at that MINT faceplate and guess what year it was manufactured? 1987.
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    Last edited by dorokusai; 12-01-2006 at 10:29 PM.

  17. #287

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    Mark,
    very nice piece !

    does she sound as good as she looks ?

  18. #288
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    Quote Originally Posted by dorokusai
    CJ PV-7 Tube Pre-Amp....look at that MINT faceplate and guess what year it was manufactured? 1987.
    No matter how old or out of style CJ gear is always beautiful.

  19. #289

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    Guts of Marsh A200S...

    BTW -- what are those 4 little circular thingys on each side of the chassis?
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    HT/2-channel Rig: Sony 50 LCD TV; Toshiba HD-A2 DVD player; Emotiva LMC-1 pre/pro; Rogue Audio M-120 monoblocks (modded); Placette RVC; Emotiva LPA-1 amp; Bada HD-22 tube CDP (modded); VMPS Tower II SE (fronts); DIY Clearwave Dynamic 4CC (center); Wharfedale Opus Tri-Surrounds (rear); and VMPS 215 sub

    "God grooves with tubes."

  20. #290

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    Quote Originally Posted by Early B.
    Guts of Marsh A200S...

    BTW -- what are those 4 little circular thingys on each side of the chassis?
    They look like the output transistors, but I don't see the reasoning for having them lay flat without a surface against those huge heatsinks. The heatsinks look like they are serving no purpose in those photos to me. I'm sure I'm missing something.

  21. #291
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    Quote Originally Posted by Early B.
    Guts of Marsh A200S...

    BTW -- what are those 4 little circular thingys on each side of the chassis?
    Very nice amplifier Early,those circle thingies are the output transistors.

  22. #292
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    Quote Originally Posted by Dennis Gardner
    The heatsinks look like they are serving no purpose in those photos to me. I'm sure I'm missing something.
    They are mounted to a metal L bracket which is screwed to the heat sink.You can see white thermal grease around the edges of the L bracket where it attaches to the heat sink which helps heat transfer.
    Last edited by GV#27; 12-02-2006 at 04:52 PM.

  23. #293
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    Early,

    They are mosfets. Cool amplifier.. one of the better sounding class A/B amp's I've heard for the price (at least, when ran direct). I hope she sings for you!

  24. #294
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    Quote Originally Posted by Zero
    Early,

    They are mosfets.
    Actually those are bi-polar transistors.Marsh uses fets elsewhere in the gain stages but bipolars for the outputs.

  25. #295

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    Bipolars can look like Mosfets when they are in a "can" (the metal encasing). Not all bipolars come in a "can". It just depends on who/how they are manufactured.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  26. #296

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    Quote Originally Posted by Zero
    ...Cool amplifier.. one of the better sounding class A/B amp's I've heard for the price (at least, when ran direct). I hope she sings for you!
    Sounds great so far. Still waiting on my tube pre to arrive. Then we'll see how the Marsh with tube pre stacks up against the Jolida tube int. amp.
    HT/2-channel Rig: Sony 50 LCD TV; Toshiba HD-A2 DVD player; Emotiva LMC-1 pre/pro; Rogue Audio M-120 monoblocks (modded); Placette RVC; Emotiva LPA-1 amp; Bada HD-22 tube CDP (modded); VMPS Tower II SE (fronts); DIY Clearwave Dynamic 4CC (center); Wharfedale Opus Tri-Surrounds (rear); and VMPS 215 sub

    "God grooves with tubes."

  27. #297
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    Quote Originally Posted by heiney9
    Bipolars can look like Mosfets when they are in a "can" (the metal encasing). Not all bipolars come in a "can". It just depends on who/how they are manufactured.
    Yes correct I have seen Mosfets and bipolars in TO3 metal can's and both in the now more popular TO3P plastic case.Marsh does use bipolars for his outputs though.

  28. #298

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    Quote Originally Posted by GV#27
    Marsh does use bipolars for his outputs though.
    Agreed
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  29. #299
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    GV and H9,

    Thanks for the correction boys.

    Early,

    I look forward to reading your impressions.

  30. #300

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    Quote Originally Posted by Zero
    Early,

    I look forward to reading your impressions.
    Yes, impressions once you have had a chance to break her in.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

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