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About Balcro

  • Birthday 08/12/1947

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  1. Now you know why it's bad practice to build square box loudspeakers. "Bigguy" is right. In a same but different way it reminds me of the only time I ever walked out of a concert to protect my ears and brain - Medicine Head playing in a very long & narrow brick walled gymnasium @ University college. I was sitting less than 20' from the back wall and roughly the same distance from the rear corner. Horrendous! Perhaps the only cheap and simple passive solution is to use thick sound absorbents on the rear wall and into the rear corners, a la "Biguy's "Corner Bass Traps".. Try sitting at least a metre from the rear wall. You'll never cure the subby bass completely because the wooden walls are resonating along their length betwen one nail fixing and the next. Picking up on "bigguys" comment, you could try a simple graphic equaliser and apply a large cut to the signal at 120Hz. That will also take out the harmonic @ 228Hz. Lastly, think of the poor fish in the tank. They probably think their living through an undersea earthquake !!!
  2. Some interesting tables and notes here on the JBL E-120 https://jblpro.com/en/site_elements/jbl-professional-enclosure-guide 1.5cu.ft = 42 Litres. * See the note at the bottom of page.2 *This is an old document hence the comments about adding more ducts, somewhat imprecise by today's standards. * Don't use fibreglass! OMG it's efficient!! https://usspeaker.com/JBL e120-1.htm
  3. If price isn't the deciding factor, then I recall this from a US web-site. (see here - https://audioxpress.com/news/New-Beyma-WR-Family-of-Low-Frequency-Drivers WR for cast frames, WRS for pressed steel. They're currently about £120 in the UK The CMV2's are around £80. It's taken 5+ years to phase out the SM series. Perhaps Phil can cast his critical eye over the specs for a "compare & contrast" opinion.
  4. Hello Hacksawbob, I'm a bit late to this party, but with reference to your & Phil's post from the 23rd November, it is my understanding that Port Tuning & size is based upon using the internal paralllel surface of the port; the flares are ignored, regardless of their curvature. The flares are there just to reduce turbulence. Your "Cookbook" source and the winISD website may have some info as well as various "hi-fi" component supplier web-sites.
  5. Very nice indeed. Enjoy.
  6. He went and got his coat. MB1 has left the building. RIP.
  7. Hello carnabass, Some more food for thought here:- Panel thickness, bracing, cross-bracing, materials, screws, construction methods etc.. https://www.audioholics.com/loudspeaker-design/loudspeaker-cabinets https://www.diyaudioandvideo.com/Guide/BuildSpeakerBox/ https://www.linkwitzlab.com/frontiers_2.htm With hi-fi they're going to the 'nth degree of nuttiness, but for the fundamentals within these pages, they are are good guide to musical instrument/bass speakers. I have my preferences and you may have yours, it all depends on what you're trying to achieve. Nice job on your speaker, by the way.
  8. It's as loud as any other 500w amp into 4ohm. By my visual calculations the gap between the feet is 17.35cm. The distance to the outside of the feet is 20.70cm.
  9. The simple wattage figures don't necessarily translate into increased volume. The drive unit inside may be more or less efficient than another, so the the volume could be less, the same or more than any other combo. As is normal, the full 500w will only be available when the Laney is hooked up to an extension speaker. Depending upon amplifier design the stand-alone output will probably be 250 -300w. Fairly heavy yes, but very well specified at a competitive price and if it's a tilt-back even more versatile. A very mixed set of descriptions online; Laney say it's a sealed cabinet, searching for pictures shows one model with a rear-port, while others look standard and yet more say it's a kick-back. Confusing. The ported version will probably be more efficient in the low-mid bass. The 30Hz graphic slider is great idea - in the "cut" position it is, in effect, a high pass filter which will clean up the low bass & de-stress the driver unit.
  10. On a serious note; sorry can't help it's built in my psyche, how about a "Profound" of bassists. From the phrase Basso Profundo (or Profondo), Latin for deep bass. It might be written on a score somewhere. It sounds obscure enough to be a question on "The Chase".
  11. Cosmo's Factory was brilliant. The early productions were spot on. Fortunate Son is a classic. Of the slower songs "Have you ever Seen the Rain" is superb. Too many of the songs in the last 20 -30 years are spoiled by John Fogerty playing at 100mph & or the pitch being set too high. Watch the duo with Bruce Springsteen, arrh!! arrh!!. The Eagles: well crafted songs & great harmonies, but for me they lack magic.
  12. PS. For the mounting information & dimensions, download the datasheet from here... https://www.beyma.com/en/products/c/low-mid-frequency/115WRS408/altavoz-15wrs400-8-oh/
  13. Hello Bigwan. Using your supplied box measurements, my earlier suggestions didn't work out, but I think I may have found the answer. Without making any physical changes to the Laney cab and assuming that the two separate enclosures are well sealed between them, i.e 2 discrete & seperate air-tight enclosures linked together, I tried modelling the Beyma 15 WRS400 in a volume of 96.8 (gross) 94litres (net of drive unit & ports) & with two 4" ports. Well, I reckon it will do the business. You end up with a very conservative power handling of 295 watts per drive unit, that is just before xMax. System tuning is in the region of 52Hz. If port chuffing is ever audible or a problem just replace the existing ports with 100mm internal diameter drain pipe and cut to a length of 19cm This will lower the tuning to 43.5Hz & the chuffing will be gone.
  14. Meanwhile, you can have a look at these. https://faitalpro.com/en/products/LF_Loudspeakers/product_details/index.php?id=151060110 https://www.fane-international.com/view-product/SOVEREIGN-15-600LF#tab-1
  15. Hello Bigwan, What's the size of the the old Laney beast. Any idea of the internal volume and secondly, (couldn't find any online pics) what is the diameter and length of any ports? 15" speakers seem to need between 50 & 150 litres each to work well in a cabinet. A lot of variation. Let me know the figures.
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