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Lenehan Audio

Commercial Member
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About Lenehan Audio

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    Queensland
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    Australia
  1. LenehanAudio Loudspeaker Design Thread

    This is a place to start ! Yes nearly flat maybe 1 db attenuation . Regards Mike
  2. Lenehan LK1 Kit speakers Reviews

    Hi Cardiiiii Fully built but not painted $2000 or finished in 2pak gloss $2500. Regards Mike
  3. LenehanAudio Loudspeaker Design Thread

    Hi Simon this is the beginning of all the horrible complexity I'm afraid . Determining what type of responses are optimal on axis and at varying degrees off axis means first setting up the drivers on your proposed test baffle And working out response step characteristics. different shaped domes have different flaring and high frequency extension characteristics. Flatter type domes have a very different off axis performance to more curved or round domes ! So the first question is tough to answer Simon . I can say that with a speaker say like the ML1 the flattest response should be around the 30degree mark . The on axis response will of course have a slight rise in the extreme top . With different speakers ! 2 way , 3way and floor standers I'm afraid it's all different because of the beaming and flaring of different diameter base and mid drivers . Then of course all the slightly different shapes of dome drivers and there flaring characteristics . 1m is the default distance for measuring ! The reason is that with gated sinusoids or MLS ( maximum length sequences) the lowest frequency you can measure with is around 350hz because this is where the floor reflection is . It's a mistake to measure wideband because under around 200 hz all rooms are subject to significant but different room gain ( room gain at 40hz is usually around 6db) The subject is way too complex for simple answers 🙀. Also from 0degrees to 45 degrees your Xover anti phase must also remain at a minimum of 25db deep. To round this up I would try and design at 1m and 30degrees off axis with a slight downward tilt with increasing frequency. Then see where it's at 15degrees and at 45 degrees. If you can take say an average measurement of 4 samples 0 to 45 degrees ( one at 0 , 15,30 and 45 )you may find it sounds like the measurement looks Whoo that was a beauty . Regards Mike Lenehan
  4. LenehanAudio Loudspeaker Design Thread

    Hi Simon . Let's look at the 45 degree off axis measurement above . this is a three way speaker but the measurement is only relevant down to about 300hz. Having said that one can see how the 6 inch midrange is beaming as its output is well down at 1500 hz . Next we can see that the tweeter output is at full level at 3000hz ! This is because the tweeter is a dome unit so it's lower frequency output is very linear and flat across a 0 degree to 45 degree arch ! But it's linear only at the bottom of the passband then it collapses at higher frequencies just like a cone driver does (but for different reasons ) Because of the shape of a dome and the fact that the dome is being driven at its edges by the voice coil ,it's obvious that the most efficient air moving part of the dome is the front face . As the frequency goes up a dome tweeter becomes less efficient at producing higher frequencies off axis . This is a function of the diminishing frequency wavelengths of higher frequencies which tend to just get slid out of the way by the diaphragm off axis instead of being effectively pushed forward by the diaphragm . I have usually found that speakers sound more like their off axis response than their on axis response . You can imagine how many speakers can sound a bit HiFi like and Glarey when this tweeter flared response is being aimed at every floor ,wall and ceiling in the place. This is is why a speaker with a very smooth flat off axis response can sound musical and detailed in a less than fully treated dead room . ljmac said exactly this in his previous post !! He prefers his ML2Limited with no damping or rugs on the floor ! A testiment I think to the very smooth flat off axis response of the ML2. Im exhausted I need a decent Red !! Bass driver beaming is another story as well of course. Regards Mike Lenehan
  5. Lenehan LK1 Kit speakers Reviews

    Thanks Dan. But I think after much R&D a CurveFloor with a concaveball will sound better 😜😳. Mike
  6. Lenehan ML2Limited with Duelund Silver Bypass

    Hi Jeff . That pair of Limited you have are using Cast Duelund caps . The Cast definitely benefit in a way I would never have predicted. The Value of the bypass cap is only 0.01uf so how Duelund does this is beyond my capacitor knowledge ! ! The positive effect they have had on your Limiteds is exactly the same as what they did to Assisi's Limiteds . The Jury is still out on how they will go over the Duelund VSF ? I know that Rawl99 has tried them and prefers the VSF without the bypass. Regards Mike Lenehan
  7. Lenehan ML2Limited with Duelund Silver Bypass

    Hi Rob. That pair of Limiteds of yours that Jeff has now use Duelund Cast not VSF. 😱. Mike
  8. Lenehan LK1 Kit speakers Reviews

    Thanks Marc They took forever to get to this level ! I’m feeling a bit guilty for taking so long 🤷🏼‍♂️ Anyway there’s another pair going out on tour next week So hopefully I can redeem myself. And yes I think we will offer them as a fully built option . Keep Lisnin Bros Cheers Mike Lenehan
  9. LenehanAudio Loudspeaker Design Thread

    Hi Lee have to say that what everyone said is usually right ! a rug on the floor between the speakers and listening chair normally works well . Again it's the tweeter flare energy off axis that causes excess energy in the upper midrange lower treble area . When the woofer beams off axis it's more a sin of omission ! So basically a tweeter flaring sounds like a glarey bright sound > the information and detail is there but it's covered up by a facade of one note whiteness. Now a Woofer beaming is less obvious > the information isn't there in the first place usually the midrange area is simply not there and varies between 4 and 10db down. I'll post some measurement pics over the weekend and describe in a bit more detail whats Happnin Lads Regards Mike Lenehan
  10. Hi Simon Yes indeed they are superior ! And unless there are scientific , acoustical or reasonable arguments to the contrary a speaker with the flattest power response will sound more accurate,musical and real than one with a wild off axis response. We we are speaking here about dynamic speakers with cone bass drivers and dome tweeters ! And in respect of these speaker types it's the Dome tweeters flare at the bottom of its passband that is the main offender in respect of that hard brash sound that is the signature of most less than 3 dimensional conventional loudspeakers . You know what lads I think I might start a new loudspeaker design thread and continue from there . Mike
  11. Lenehan LK1 Kit speakers Reviews

    Hi Simon Yes indeed they are superior ! And unless there are scientific , acoustical or reasonable arguments to the contrary a speaker with the flattest power response will sound more accurate,musical and real than one with a wild off axis response. We we are speaking here about dynamic speakers with cone bass drivers and dome tweeters ! And in respect of these speaker types it's the Dome tweeters flare at the bottom of its passband that is the main offender in respect of that hard brash sound that is the signature of most less than 3 dimensional conventional loudspeakers . You know what lads I think I might start a new loudspeaker design thread and continue from there . Mike
  12. Lenehan LK1 Kit speakers Reviews

    The first reflection is always the floor ! But of course this is a constant so can be accounted for in the Xover for a listening distance window . The next reflection is usually the roof or side walls , the roof is not as constant as the floor but it can still be averaged in the Xover The last two are I believe the most important ! That is the direct sound and the 45 degree off response . The 30degree off response usually sums behind of where the listener is and the 60 degree off usually sums well in front of where the listeners ears are . ( of course this obviously also depends on loudspeaker toe in or out ) 45 is quite critical because it defines the power response or dimensional resolution of the loudspeaker in an average room ( no such thing of course I know ) BUT the idea is to give the speaker the best possible average chance . Here's a question for the dedicated ! Would you pay to rent a high end system in a high end super tuned room for a night or two ? In other words a speaker system with a Xover designed for an exact room with near perfect acoustics . Mike
  13. Lenehan LK1 Kit speakers Reviews

    That candy paint is bloody magnificent . Mike
  14. Lenehan LK1 Kit speakers Reviews

    Hi Pops Definitely haven’t forgotten you guys ! I’ve sent one pair out which will ship forward in about 10days and I’ll have a second pair going out midweek . Not sure who’s next cause I’m at home sipping on a red [emoji485] I’ll be updating early next week . Mike
  15. High Efficiancy Speakers From Mike

    Hi Bill . Does this little amp have 4 ohm taps on the output transformers ? For valve amps its capacitive loads that are a problem not lower impedances ( as long as the transformers are set up for 4ohms of course) I have some very nice Dayton 8inch drivers here that I could run in diappolito which could give us 101db sensitivity ! . Mike
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