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MGO

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    Sydney East
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    Australia

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  1. Hey ZOOTYtooty, Which drivers were originally in this beast? What are the dimensions? Cheers Mark
  2. Item: Metaxas Ecstatic - Electrostatic Speakers Location: Sydney East Price: Sale Pending: $200 pick up only Item Condition: See below. Reason for selling: One speaker needs repair Payment Method: Pickup - Cash, Paypal Great sounding electrostatic speakers. In beautiful cosmetic condition. One working perfectly and was recently recoated and voltage rails replaced. The second speaker has a burned audio step-up transformer, requires replacement or rewinding. ER Audio in WA has replacement transformers for around $450.
  3. Item: JBL 2440 Compression Drivers 2" AlNico with Genuine JBL Titanium Diaphragms - pair Location: Sydney Price: Now reduced to $390 plus postage Item Condition: Used - working Reason for selling: NLR Payment Method: Pickup - Cash, Paypal, Bank TT These are sought after large format 2" throat JBL 2440 have AlNiCo magnets. Diaphragms are genuine JBL titanium. A bit rough looking but sound great. These usually sell for over $1000.
  4. Yes. I think they cut with big saws and water. I had them cut for me for a project.
  5. I don't want to be a grumpy old man (I am) but it does annoy me somewhat. There ought to be a way for anyone to be able to delete the ad after viewing. I appreciate your efforts as a moderator.
  6. Hello, This ad is pinned to the top of my classified list. How do I unpin it? Thanks
  7. Here is my take on the sonic differences between vesiculated basalt (VB) and slate: VB is a very rigid rock and is porous because of vesicles formed by gases caught in the cooling lava. VB’s sound absorbing properties come from its porosity which decreases both sound velocity and also increases absorption, and so attenuates sound passing through it and decreases reflections as well. All this and a rigid platform too. Slate is a very dense material created by successive high pressure layering of fine sediment/silt. Its main attributes for decreasing sound propagation seem to be due to its density, boundaries between layers and friction between the very fine particles it is composed of. Slate doesn’t seem to decrease sound velocity, it is quite reflective and not very absorptive. It has limited attenuation. I think these physical characteristics can be heard. With slate conveying a hard and solid sound. Whereas VB is musical and open with a large sound stage. A couple of publications to add weight to the topic: Article in Geophysics 37(4) · August 1972 with 125 Reads DOI: 10.1190/1.1440287 Edwin L. Hamilton Abstract In‐situ measurements of compressional (sound) velocity and attenuation were made in the sea floor off San Diego in water depths between 4 and 1100 m; frequencies were between 3.5 and 100 khz. Sediment types ranged from coarse sand to clayey silt. These measurements, and others from the literature, allowed analyses of the relationships between attenuation and frequency and other physical properties. This permitted the study of appropriate viscoelastic models which can be applied to saturated sediments. Some conclusions are: (1) attenuation in db/unit length is approximately dependent on the first power of frequency, (2) velocity dispersion is negligible, or absent, in water‐saturated sediments, (3) intergrain friction appears to be, by far, the dominant cause of wave‐energy damping in marine sediments; viscous losses due to relative movement of pore water and mineral structure are probably negligible, (4) a particular viscoelastic model (and concomitant equations) is recommended; the model appears to apply to both water‐saturated rocks and sediments, and (5) a method is derived which allows prediction of compressional‐wave attenuation, given sediment‐mean‐grain size or porosity. Compressional wave attenuation in oceanic basalts William W. Wepfer Nikolas I. Christensen First published: 10 October 1990 https://doi.org/10.1029/JB095iB11p17431 To understand better the seismic attenuation in the upper volcanic regions of the oceanic crust, compressional wave attenuations of oceanic basalts have been measured as a function of confining pressure using an ultrasonic pulse‐echo spectral ratio technique capable of measuring attenuations to pressures of 500 MPa. Seven basalts, five from Deep Sea Drilling Project cores and two from dredge samples, have wide ranges of densities, porosities, and alterations, making possible an analysis of the parameters influencing basalt attenuation. Attenuation increases with the volume of secondary minerals present and with increasing porosity. Thus vesicularity and compositional changes associated with basalt alteration will produce variations in attenuation. With the application of hydrostatic pressure, cracks close, thereby reducing attenuations. This pressure dependence should be manifested in oceanic layer 2 by decreasing attenuation with depth. An inverse relationship between velocity and attenuation is observed at high hydrostatic pressures. Water saturation increases attenuation at pressures below 200 MPa and enhances the sensitivity of attenuation to pressure, thus making the state of saturation important in the 40 to 100 MPa range generally found in layer 2. These results provide a framework for interpreting marine attenuation data.
  8. Item: Vesicular Basalt (Lava Rock) Isolation Slabs Location: Sydney East Price: See below Item Condition: Used - A million years old. Reason for selling: Excess Payment Method: Pickup - Cash, Paypal, COD Only, Bank TT Vesicular Basalt (Lava Rock) is the best isolation platform material there is! It is vastly superior to wood, marble, granite, and absolutely smashes glass. Its sound improvement properties are believed to be inherent in its structural rigidity and porosity formed by gases during lava formation and cooling. Instantly audible improvement in sound quality. Just by placing under your equipment. Also sold by Bocchino Audio http://www.bocchtech.com/bocchinoaudio/isolationplatform.html I had these pieces cut and imported. What is left from various projects: 800 x 500 x 40 mm. Perfect as a large turntable isolation platform. $600 One left. Will definitely improve your analogue sound 450 x 450 x 20 mm. Great under any source electronics, CD players, amps, smaller turntables. $70 each 2 pieces. 400 x 400 x 20 mm. Great under any source electronics, CD players, amps, smaller turntables. $50 each 2 pieces. These are heavy, rigid things. So pick up only.
  9. Item: JBL 2241H - 18 inch Pro Woofers - Near Mint x2 Location: Sydney Price: $675 pp Item Condition: Near Mint Reason for selling: NLR Payment Method: Pickup - Cash, Paypal, Bank TT Hugely dynamic woofers from JBL in near mint condition. Drivers only. FR 30 Hz - 3 kHz and 98 dB sensitivity.
  10. Item: JBL 2440 Compression Drivers 2" AlNico with Genuine JBL Titanium Diaphragms - pair Location: Sydney Price: Reduced to $500 from $600 plus postage Item Condition: Used - working Reason for selling: NLR Payment Method: Pickup - Cash, Paypal, Bank TT These are sought after large format 2" throat JBL 2440 have AlNiCo magnets. Diaphragms are genuine JBL titanium. A bit rough looking but sound great. These usually sell for over $1000.
  11. Item: Metaxas Ecstatic - Electrostatic Speakers Location: Sydney Price: $400 pick up only Item Condition: See below. Reason for selling: One speaker needs repair Payment Method: Pickup - Cash, Paypal, Great sounding electrostatic speaker. In beautiful cosmetic condition. One working perfectly and was recently recoated and voltage rails replaced. The second speaker has a burned audio step-up transformer. This needs either replacement or rewinding. There is a local transformer company that can do the rewind for $520 plus GST. So for less than $1000 the new owner can have these fabulous speakers working as new.
  12. Item: Oyaide / Acrolink Power Cord Connectors IEC and US Location: Sydney East Price: Sale Pending $95 plus postage (Half RRP) Item Condition: Very good Reason for selling: NLR Payment Method: Pickup - Cash, Paypal, Bank TT Very good connectors removed from an Acrolink power cord. US plug and IEC. Pictures:
  13. Item: JBL 5234 Pro Electronic Crossover 800Hz 2-way Location: Sydney East Price: $250 plus postage Item Condition: Used - works great. Reason for selling: Going 4-way Payment Method: Pickup - Cash, Paypal, Bank TT Excellent vintage electronic crossover. The sound is very good - analogue. Has internal boards set to 800Hz, 12dB slope. These can be changed. The internal op-amp has been upgraded to a top of the line Burr-Brown OPA2604. Made a big improvement in SQ. Also, the connectors are RCAs changed by a previous owner.
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