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About almikel

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  1. almikel

    Ported or not

    Thanks guys - I wasn't aware of that rule/guide - even if it may be ok to break it, it's still good to know
  2. almikel

    Catman's Analog Musings

    agree completely - that's my point. Felix is questioning why a phono amp requires the additional circuitry of an input op amp buffer. I'm saying the buffer is to provide a low impedance source to the 2nd opamp which makes the RIAA phono filter circuit. Using a single op-amp for the RIAA filter without an input buffer does not provide a low impedance source, so linearity of the RIAA filter (op-amp and feedback) may be compromised. Mike
  3. new load of Foobar done - same deal - just can't seam to be able to get a "file structure" view. "View" -> "layout" -> "quick setup" gives no joy - everything is album based, not artist then album??? struggling - using JRMC instead atm (which has it's own issues, hence Foobar was my preference) Foobar used to be so simple - the Files option in JRMC is approx what I used to run in Foobar Foobar left window (used to) look like Music artist1 album1 song 1 song 2 album2 Artist2 album1 Click on artist1 and all the albums/songs for artist1 appear in the right side window for playing. My brain just likes the file structure. I hate the "Artist"/"Album" structure of JRMC where you may have a FLAC and MP3 version of the same album, and it shows and plays the double ups - I'm sure there's some config around it, other than resorting to the "files" structure?? If I could get back to the Foobar file structure that would be great. cheers Mike
  4. Thanks FD, yes it's a windows PC, but I've changed config in the Foorbar app, not something that requires a "system restore" approach, nor I suspect would be fixed by a "system restore" approach, I just need to undo what I've done in Foobar. A reload of Foobar could be warranted though... Thanks for your input cheers Mike
  5. almikel

    Catman's Analog Musings

    ^this Exactly - in writing my last post I initially wrote, "that's what the 1st op-amp does in Rod's design", but edited it out prior to posting. what more do you need? Rod says that's what the 1st op amp does - provides a buffer to provide a low impedance source for the 2nd op-amp filter that does all the work (carefully filters according to the RIAA EQ)... cheers, Mike
  6. almikel

    to veneer or not to veneer

    mmm, make me wonder what else is hidden under the vinyl - if there's swelling on the bottom of the cabinets, then they may be rooted 😂
  7. almikel

    DEQX Owners Thread

    Hi @ghost4man I thought I said that? was there another MiniDSP product better suited for the OP's requirements I missed? cheers Mike
  8. almikel

    Catman's Analog Musings

    Hi Felix, an op-amp filter works better when driven from a low impedance source - I learned this from Rod Elliot. An example is here: http://sound.whsites.net/project09.htm Input Buffer - ensures that all filters are driven from a low impedance source, to prevent frequency and phase shifts Rod re-iterates this elsewhere on his site, and other sources for op amp filter design say the same. Given your understanding of electronics and familiarity/respect for Rod Elliot's work (as I have), I'm surprised you trot out: A great many typical "audio anythings" are driven by marketing, not good engineering... ...for an op-amp filter to operate properly, it needs be driven from a low output impedance source - hence buffering is an issue (and why Rod has 2 op-amps in his phono). cheers, Mike
  9. Hi all, I mucked with my Foobar settings when my MonkeyMote iPhone app stopped working, now I can't get Foobar back to what I had before... I'm a simple person - my previous Foobar settings worked perfectly for me - left side was a "file" view of artists with albums as sub folders. Click on the artist and get all the albums present on the right hand side and click the top song and play them all. I've now got a different interface where I need to drag albums/songs from the left into the right side to play them Apologies - hard to describe without screen shots (wrong laptop)... any advice appreciated to get back to what I had previously... ...also what do others recommend for an iPhone app to manage Foobar and/or JRiver? cheers Mike
  10. almikel

    to veneer or not to veneer

    if the cabinets are still still solid/sound, then I wouldn't bother making new boxes, just peel the old vinyl off and re-finish any way you want (veneer, paint, duratex etc). If the cabinet material has been compromised (swelling, splitting etc), then look at new cabinets Mike
  11. almikel

    Catman's Analog Musings

    Hi Felix, so is your Bruce Heran single op amp phono stage connected directly to your cartridge? If so, what is providing the buffering? ie a source with a very low output impedance? cheers Mike
  12. almikel

    DEQX Owners Thread

    Thanks Andy that's my definition of a pre-amp @shogo33 I had a surf around the MiniDSP site MiniDSP 10x10HD here: https://www.minidsp.com/products/minidsp-in-a-box/minidsp-10x10-hd It doesn't have USB audio in, which is a pain if you run music on your laptop (a strike against your "simplification" requirement), and only has 2 digital "in" connections - a big strike if you happen to run 3 digital sources It also doesn't do the FIR speaker correction that DEQX can do (which I use extensively with my 4 way active setup - but your SGRs are likely pretty well sorted). It does do IIR room correction, but you would have to do it manually (measure with REW, use MSO to calculate EQ and delays, then apply them in the MiniDSP 10x10HD) Looking at a different MiniDSP product, the DDRC-88A : https://www.minidsp.com/products/dirac-series/ddrc-88a It can apply FIR filters for speaker/room correction - but it has no volume control or digital inputs , so can't function as an audio pre-amp... ...and it's digital brother DDRC-88D - has no volume control or analog outputs so can't function as an audio pre-amp... based on your requirements: "I'm hoping to do away with my analogue preamp and use a DEQX unit as a preamp for my digital sources to simplify my setup and also do speaker and room correction?" A DEQX unit will do this very well all in a single box with one interface. Within the MiniDSP range the 10x10HD comes closest to your requirements, but with no USB audio input (assuming you have music on a PC) and/or if you have a requirement for more than 2 digital sources - these are big strikes against a MiniDSP solution for your "simplification" requirement. I'm a happy DEQX customer starting 8 years ago, and I added another a few years ago for my double DEQX 4 way active setup. Apologies if I took you down a rabbit hole - I was just trying to present other options - which didn't exist 8 years ago. cheers Mike
  13. almikel

    Twin 15" subwoofer

    a little OT - but relevant to producing the lowest octave - is an interesting comparison discussing power and excursion on one of @Paul Spencer's blog pages comparing a sealed cabinet with a tapped horn... http://redspade-audio.blogspot.com/2012/02/how-does-sensitivity-of-tapped-horns.html @ Paul, if you object to me re-posting your image I'll delete it... The dark blue line is a sim of 2 x 12" subs in a sealed box at their excursion limit using around 185W for each driver - half of the plate amp capability for each driver. The red line shows the sim of the tapped horn at the driver excursion limit which also uses the full power of each plate amp (370W each). (the lower curves are at 1W, light blue is sealed and black is the tapped horn). In the example of the tapped horn, the design of the enclosure (ie tapped horn instead of sealed) helps to hit the bottom octave within excursion limits of the driver using "moderate" power (740W). cheers Mike
  14. almikel

    Catman's Analog Musings

    generally op-amp filters benefit from being driven from a low output impedance source to improve linearity (in this case compliance to the RIAA curve), so you put an op-amp buffer at the input. Mike