mistenker at 2x15" er hakket for stort for dette designet, men det kan kanskje gå hvis man dropper H-baffel og bein.
Mon tro hvordan denne kan skaleres opp med 2x15" - får prøve å tegne litt
mistenker at 2x15" er hakket for stort for dette designet, men det kan kanskje gå hvis man dropper H-baffel og bein.
Mon tro hvordan denne kan skaleres opp med 2x15" - får prøve å tegne litt
Du er ikke alene!
Jeg har da sveiseapparat - må øve litt mer på TIG 10-15 meter med firkantstål koster da ikke all verdens. Så må den lakkeres. Mulig dette kan gjøres med boks?Om du har plass, er det ikke mange kronene for ei grei plateknekke. Alternativt, fins blikkenslagere overalt
Kommer vel på ca. 12-13k ink frakt, moms og gebyrer. Sendes fra Tyskland.Syntes dog ikke prisen var ille med såpass grei finnish...
Ja!Siden dette er en OB tråd til inspirasjon og jeg snart kaster meg ut i et forsøk på dette, kommer jeg med et spørsmål - Er tre elementer på 7 Ohm i parallell en samlet impedans på 2,33333 Ohm?
Takk for svarJa!Siden dette er en OB tråd til inspirasjon og jeg snart kaster meg ut i et forsøk på dette, kommer jeg med et spørsmål - Er tre elementer på 7 Ohm i parallell en samlet impedans på 2,33333 Ohm?
Parallel Resistor Calculator R1 + R2 = equivalent resistor R resistance circuit equiv total resistor finder made easy piggyback = parallel - sengpielaudio Sengpiel Berlin
These consist of a pair of open MDF baffles housing full-range Alpair units plus an 18" AE (Acoustic Elegance) Dipole woofer......simple, 2 drive units & no cross-over to sap efficiency & resolution.
The bottom line for every speaker system is always the sound. These speakers produce a very large sound stage with excellent dynamics. By having such a large woofer cone surface area, the reproduction of a drum solo is getting closer to feeling and hearing the drummer. The bass is not overwhelming or boomy on any recording I have tried to date. The bass response is tight and in proportion to the Lowther mid range and high end SPL response. Once the crossover slopes and frequencies, along with the amount of bass boost, have been dialed in to mate with the room the two drivers mesh seamlessly.
Open baffle bass is different from a boxed enclosure, there is no dominant one note resonant response sometimes heard in boxed designs. Instead the H frames have the capability to reproduce different bass notes clearly and distinctly. This nonresonant bass reproduction makes it easy to distinquish between a string bass pluck and a drum strike. At the same time, these speakers can shake the house if required when playing the 1812 Overture or Micky Hart's Temple Caves for example. Yet they still generate an effortless reproduction of an up-right acoustic bass in small group jazz recordings with precise imaging that I really enjoy.
One of the interesting things I have noticed in the past with this type of driver combination is that the driver cones barely moved even at very loud volume levels. You have to touch each driver to convince yourself it is connected and contributing to the system SPL output. This minimal deflection of the four bass drivers has to help reduce distortion from the woofers. At the same time removing the bass duty from the Lowthers greatly reduces cone motion cleaning up the mid range performance. The full range driver sound is retained with the four woofers handling output below 300 Hz and having all the drivers correctly integration at the crossover frequency.
However nothing is perfect in audio and the Lowther OB / Acoustic Elegance H frame combination does have a couple of problem areas that I am not sure continued tweaking will ever improve. For the acoustic jazz I listen to most, the system performs very well. But large scale complex classical music can get a little garbled / confused and even slightly harsh at times if the recording is particularly dense. A second down side is that poorly recorded material really sounds poorly recorded, the system is not very forgiving. However, on the other side of the coin really well recorded material sounds great. Even with these slight problems I am still enjoying this design and combination of drivers and will use it as my reference system for the foreseeable future.
It will be difficult for upcoming speaker builds to perform at this level.
Husk at en H-frame må være like dyp framme og bak!Dette kan jo være noe. Hva med 2 x H frame i høyden, U frame med 203 og T500 på toppen.
enclosure Lowther dx3I was looking at a shallow H frame, but when I centered the baffle the huge magnet was going to stick out the back and look like crap. So I started looking at a U frame but started to get concerned that the driver was at the front, cost a bit, and I was worried about it getting damaged by accident. So I recessed the driver baffle 2 inches to give it some protection, hide the magnet, and still have a shallow enclosure. The calculated response for all three options (U, H, and offset H) was so close it really was not a big performance trade-off.
Final external size was 17.25 inches square and 11.75 inches deep that can get down into the 20 to 30 Hz range. Pretty compact for a 15" woofer going that low compared to a boxed speaker. Two per side run in parallel to produce enough SPL to match a Lowther full range driver. Since the bass units are paired yet independent, I have enough flexibility to use only a single unit and mate it with a different OB or boxed system. Or I can stack them to reduce the footprint on the floor.
I like the bass output, I love the Lowther sound, so it is a good simple pairing in my opinion.
The Acoustic Elegance Dipole 15 woofer has a lower fs of 22 Hz and a Qts of 0.8 which when combined with a 12 dB/octave low pass crossover, my standard recipe for the Alpha 15A woofers, results in a rolled off low frequency response which does not reach very deep. The 6 dB/octave dipole roll-off starting above 100 Hz really attenuates the deep bass output, the dipole response has rolled off the woofer's bass output by 12 dB by the time you get down to 25 Hz (two octaves below 100 Hz). My solution was to use a 6 dB/octave low pass filter set to about the driver's fs to counter the dipole roll off yielding a flat low frequency response
Her er litt harde fakta om EQ behov med dipole15 fra John himself
https://m.facebook.com/story.php?story_fbid=10153053138346866&substory_index=0&id=85313456865
Kanskje B4 vil fungere bedre i et slikt oppsett, den har ikke en +6dB i bunn.Many people are interested in using open baffle woofers but simply don't know where to start. We will be having more information on this in the future, but here is a simple starting point that requires only one active filter. This model is for 2x Dipole15's on a small 18"x34" flat baffle that is really just big enough to fit the drivers. The red curve is the natural response. This shows the high amount of baffle rolloff there is to contend with and explains why a passive crossover design can be difficult to implement with open baffles.
However, with one simple 6dB lowpass at 35hz, things smooth out very nicely. Response is now +/-2dB from 23Hz to around 400hz. With 36V input this system will give 102.7dB at 30hz without surpassing the Xmax limits of the two Dipole15's. Increasing the baffle size can increase the low end efficiency further and in turn increases the efficiency of the whole system. More on this later.
Tror ikke det, uansett så koster ikke et brukt B5 veldig mye og det er verdt å prøveNoe i den stilen ja. Litt triggerhappy på delefilter nå.
Blir det for mye med boosten på +6dB/20Hz som First Watt B5 gir, tenker da sammen med 4 x Acoustic Elegance Dipol 15?