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    Always late to the party: Another ER18 build (Rosewood & Maple, Experiments with Joinery)

    I don't know how much it might affect what you're hearing, but the port diameter and length I specified is only applicable if neither end is flared. A flare on either or both ends requires the port to be longer in order to create the same tuning frequency for the same diameter. So if your...
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    Always late to the party: Another ER18 build (Rosewood & Maple, Experiments with Joinery)

    I wasn't quite as clear as I wanted about increasing the stuffing density. You certainly could increase it just to see if it solves your problem, but I don't think it will without possibly also causing other problems. I use Martin King's software for all of my TL modeling and Martin limited...
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    Always late to the party: Another ER18 build (Rosewood & Maple, Experiments with Joinery)

    On stuffing changes... I took a look at the cabinet design info and I used a stuffing density of 1 lb/ft3 in this design. This is the highest stuffing density whose effects I can confidently predict and more than this should not be required. On a personal basis regardless of the stuffing...
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    Always late to the party: Another ER18 build (Rosewood & Maple, Experiments with Joinery)

    Dennis alerted me to the questions about boomy bass. First, though, the cabinets are absolutely gorgeous and you should be very proud of your handiwork. As far as the boomy bass is concerned, I have the very same problems on some CDs and I suspect the boominess is occurring around 100-125 Hz...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    Reporting coverage has been kind of slim (pun intended) and I'd sure like to see more. On another note, I was watching The Bridge on FX last night and noticed one of the co-producers was named Dennis Murphy. So I guess we all now understand how Dennis can keep his speaker manufacturing...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    I wouldn't think this is their official name, but don't actually know, and if it is, I could think of far worse. Paul
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    Of course you could but that would show you only what the woofer is doing, not what the system is doing. The modeled response shown for the P2 is the predicted system bass performance, which is the woofer and port outputs combined properly in magnitude and phase in an anechoic environment. Paul
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    To be completely fair, as best I can tell, the graph for the EMP subwoofer is an actual measurement, whereas the graph (of mine) you show for the Phil 2's woofer is a modeled graph, not an actual measurement, which is idealized and does not take into account room effects. Not saying in the...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    You probably hit on something in wondering about John's take on TLs. John said that the response of a TL ought or should be aperiodic, which makes me wonder if that's simply his preference or there's some old technical "rule", real or mythical, that he's quoting? John further said he thinks...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    Surprise, you not only got a direct reply but rather quickly! I may be biased but there's no way I'd call the bass in a properly designed and implemented TL as being ponderous, nor would it be disconnected from the rest of the system unless the crossover design wasn't up to snuff (anyone here...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    Here's his email address: john.atkinson@sorc.com Reference his comment about the Philharmonic Audio speakers at the 2012 Capital Audio Fest having "slow bass" and ask him what he means by the comment and why he thinks TLs have that characteristic (what is it that makes TLs have slow bass in...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    That would be interesting to do, but if either I or Dennis were to ask, our query might be viewed as combative and based on "sour grapes". So, would someone else be willing to ask? For complete fairness, here's exactly what John said in his comments about the Phillie 3s at this year's...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    It's difficult to know for sure the reason for the comment, but there are a number of "myths" about TLs that, while they have been disproved, especially once rationale models were built and tested, leading to really good modeling software, still crop up from time to time. Slow bass is just one...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    Actually I like John's objective tests (measurements) quite a lot. He doesn't really pull any punches and has often commented on why the subjective reviewer didn't mention hearing something amiss which John's measurements indicated ought to be audible. It might be interesting, however, if...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    Glad to be here. Independent of your explanations below, the slow bass thing has caused a few laughs. The most recent came from Dennis. At the last two Capital Audio Festivals in D.C., a Stereophile reviewer (John Aktinson, I think) made some very favorable comments about the Philharmonic...
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    Thanks for the welcome, Richard, and the compliments. Every now and then Dennis would ask me to comment, through him, on a post here, so I thought it was about time I went direct. Paul
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    Philharmonic Audio - 3-way open back ML-TQWTs designed by Dennis Murphy

    I thought it was about time I registered on Audioholics so I can directly respond to some posts about Philharmonic Audio designs I've been involved with. Every now and then someone mentions "slow bass" as being a typical characteristic of TLs. I have no idea what they're talking about as...
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