![]() The frequency response of the 145R is rated at 150 Hz to 15 kHz (+/- 1 db, reference 1000 Hz). This can be achieved by adjusting the input level to the reamp box and / or using a level control on the reamp box. The 145R will give around 20*log10(1/3) = -9.5 dB attenuation, so we'll need an additional 12 dB of level reduction to match +4 dBu to a typical guitar level. (The Hammond 145R is available from a number of on-line sources including Mouser and Digikey. What is critical is to correctly load the secondary of the transformer. We just need to attenuate the output level somehow.ĭigging around in my transformer "junk box", I found a Hammond 145R - 20k primary to 2K secondary (a turns ratio of around 3:1). My conclusion: the transformer turns ratio isn't that critical. Other designs (e.g., the popular "New York Dave" design) use a 4:1 step-down transformer. Some designs use a direct box step-up transformer (the original reamp box did this, using a 1:7 transformer with input attenuation) while other designs use a 1:1 transformer (the Jensen design shown in application note AS092.pdf does this). It also needs isolation on the output to avoid ground loops. ![]() Output level: ideally the same as your guitar - around 100 mV RMS or -18 dBu (unbalanced) - this can vary quite a bit depending on your pickupsįrequency response: For guitar - 69 Hz (drop C#) to 10 kHz or so (for bass we'd need to go down to 30 Hz) Input level: typical line level from a mixer or audio interface - +4 dBu (balanced) It worked out much better than expected so I'm sharing my design in the hope that others will find it useful.Ī quick survey of reamp box designs led me to the follow requirements: I didn't have a reamp box so I decided to build one. (There's a good video on YouTube by Pete Thorn showing this.) All you need is a decent audio interface, a mic (or two) and a reamp box. After some digging, I found that you don't need the Tonex Capture. Suggestions mail me at mike.ralph at gmail.I recently got a Tonex pedal and wanted to capture a couple of the tube amps I've made. Good luck if you're making one! If you have any comments or My new set up with iso box! Ive added a latch to seal it Theĭraught excluder seals around the leads well enough for our needs. The cab and mic leads can just go over the sides. Ive gone for Nylon swivel plate 75mm castor wheels that each Remember to leave some space at the sides so it can fit snuggly when it Staple in the lower contour of the foam nearer the ![]() 4 staples applied approx 4" in inĮach corner will suffice. Ive stapled so IĬan remove at a later point if needed. I bought my "eggshell acoustic soundproof treatmentĮach tile is 15� (381mm) x 15� (381mm). Notice I havent been very neat with my silicon - it doesnt matter as foam Also remember to open a few windows - the stuff stinks and is badįor you! Once thats done you can start stapling the foam to the inside of theīox. Give the silicon a day to dry depending on how thick youveĪpplied it. Apply the silicon to all joins in the box. Now we're ready to add some extra soundproofing before we install ![]() At this point Ive alsoĪdded the draught excluder rubber trim for the lid. Thing its a good idea not to rely solely on the glue. Ive reinforced theīuild with metal brackets at each corner. I started with the box on its side for practicalĬontinue until you have the basic shell. Start by gluing your box together with wood glue and Right angle metal brackets and �" screws If its not off the floor you will still get neighbours complaining! The castors help take away the booming low end off my studioįloor. Itĭoesnt sound muffled or odd in any way. All you get is total tone right into the microphone. Signal going in with the SE100 and get a truly awesome combined sound.Īlso this thing REALLY WORKS! I can crank my power amp right With this box and my SM57 I create a stereo The closest Ive come is using my Marshall SE100 Speaker Emulator direct. No DI sound I've tried comes close to miking up a cab. Various methods of getting "that" sound to my computer (NI Guitar I decided to build this after years of messing around with JCM 2000 TSL cab and Shure SM57 with mini mic stand Mike Ralph's DIY speaker cabinet isolation box fits a 2x12Ī, mirrored at Mike's request. ![]()
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