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This crossover track near Union Depot seems to have been under construction for a very long time. It seems to be among the last section of track to be fully completed.
CROSSOVER FILM FEST
26.01.2011
6pm
at Raffles on the 10th floor
117, Nguyen Van Troi str. PN dis. HCM city
Designed by Ryan Tran
My version of a brick-built 90º crossover, based heavily on Ben Coifman's. Instructions and LDD files can be found in my Brickshelf gallery (once moderated).
Eurostar Siemens 'Velaro e320' Class 374 half-set No. 4020 passes the Nashenden Crossovers before crossing the Medway Viaduct working the 9O15 09:13 Paris Nord to St Pancras International service
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DRIVER SELECTION:
I wanted to keep the cost of the drivers to 90dB sensitivity.
* Tweeter: Goldwood GT-510 1" (~$11 each, 8 Ohm, 90dB at 1W/1m but the graph suggests it's closer to 93dB)
* Mid/Woofer: GRS 8FR-8 8" "Pioneer BOFU clone" (~$14 each, 8 Ohm, 91dB at 1W/1m)
CROSSOVER (designed by Chris Roehmer on PartsExpress TechTalk forum):
"So we put a 'Zobel' across the 8" terminals (an 8ohm resistor and a 10uF cap - an "npe" is fine here) which pulls its impedance at 20kHz down from 160ohms to 8ohms. That lets you get by w/a relatively small (1st order) coil. Use a 0.60mH #20.
The tweeter needs to go 2nd order (a big reason why is that it does NOT have "ferrofluid" and hits 27ohms at Fs). You need a 3uF series cap and then a 0.40mH "shunt" coil (to gnd). Between that filter and the tweeter we need an "L-pad": SR = 4ohms, PR = 12ohms.
This crosses around 3.5kHz. Shouldn't sound too bad. Looks like the worst "artifact" is about a +3dB "hump" around 800-1000 cycles which is inherent in the 8"FR's response."
2722 leads the 16.45 Clonmel - Waterford special into Carrick on Suir,June 30th 2011, to an awaiting crowd.
My shutter button timing was much better than usual, I got both aircraft in the shot :) . Taken at Kokomo Wings & Wheels
The disque bleu was placed about 500 m in advance of the crossover used for backing onto a service track (refoulement). It was normally parallel to the track. When perpendicular to the track and showing a blue light by night, it authorized a reverse movement onto the service track, showing that the crossover had been lined for this movement. There was usually a disque jaune at the crossover, which was parallel to the track when the crossover was reversed. This signal governed exits from the service track.
Cité du Train museum in Mulhouse France
Randy Carrasco, left, residency pastor at Huntington Beach Church, tells locals on the Huntington Beach boardwalk about a free surf camp being held June 11 by the church as part of Crossover Anaheim. The camp was part of several evangelistic outreaches sponsored by the North American Mission Board (NAMB) held across the greater Los Angeles area prior to the Southern Baptist Convention annual meeting, June 14-15 at the Anaheim Convention Center.
Photo by Sonya Singh
A Peugeot estava adormecida no segmento dos crossovers, mas decidiu acordar em 2013 com o lançamento do seu novo 2008. Este carro tem pinta e charme, embora pudesse ter um design de carroçaria mais arriscado. Contra concorrentes de peso como o Nissan Juke ou o também ele recente Renaul Captur, este crossover urbano "leonino" tem de colocar as cartas todas na mesa para se chegar à frente.
mockup of the crossover I'm making for my speakers. This one is including the attenuation circuit for the tweeter (2 resistors) that will lower the output by 3dB to nominalize all levels to 88dB. Haven't decided if it will be included in the final.
I ended up not including the attenuation circuit.
Two Pitts Special aircraft take off in opposing directions at the NatFly 2013 event at Temora Airport, at the start of a display flight.
Oberstdorf, Bavaria, Germany
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