PLUTO-2.1 Construction

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Katrina Pearson
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Construction Electronics Supplies Photos PLUTO+ Pluto-2.

It provides the necessary additional detail for constructing PLUTO-2.1. Ignore the earlier Pluto-2 information on the owner-support page.

1 1 von :16 B u i l d y o u r l a s t l o u d s p e a k e r s y o u r s e l f o r l e t u s b u i l d t h e m f o r y o u Introduction Specifications Construction Electronics Supplies Photos PLUTO+ Pluto-2.1 What's new The information presented here is supplemental to Revision 4/27/05 of the PLUTO Construction Plans. It provides the necessary additional detail for constructing PLUTO-2.1. Ignore the earlier Pluto-2 information on the owner-support page. Concepts Stereo Recording and Rendering A - Replace the Peerless woofer/midrange drivers with Seas L16RN-SL (H ) available from Since the driver has a circular mounting rim it is not necessary to use the cardboard gasket described on page 11. Stuff the 4" pipe uniformly with Acoustastuf by adding 85 gram for a total of 200 gram. The tweeter's surround plane should be set back 3/8 inch from the edge of the woofer's basket rim.

2 von 11 19.12.2012 10:16 Loudspeakers Crossovers B - Crossover/Equalizer/Amplifier electronics Use the updated material list Pluto-2.1-material list.

2 2 von :16 Loudspeakers Crossovers B - Crossover/Equalizer/Amplifier electronics Use the updated material list Pluto-2.1-material list.xls Room acoustics Issues in speaker design Projects LX521 monitor ORION challenge ORION-3.4 PLUTO-2.1 WATSON-SEL PLUTO+ subwoofer THOR subwoofer PHOENIX dipole speaker Active filters Microphone

3 3 von :16 FAQ Three-Box active system (1978) Reference earphones Surround sound Components with new values and the two added R-C networks are circled on the schematic and in red on the layout diagram. Tweeter channel gain 2.1 R k R22 10k Tweeter high frequency boost R k C nF Tweeter notch filter 2.1 R k Products ORION & PLUTO by Wood Artistry Do-It-Yourself Resources Publications Sound recordings Links Other designs My current setup Woofer boost R55, k R57, k R58, k C58 390nF C59, nF C60 open C61 330nF Midrange down shelf 2.1 R k C nF Midrange notch filter 2.1 R k C64 68nF C65 150nF Amplifier stability control C41, 81, pF

4 von 11 19.12.2012 10:16 About me Site map 2.1 = changes to Pluto-2 The leads of C64 and C65 have to be bend so that the two capacitors fit into the pcb next to each other.

mounted to an Aluminum sheet metal piece and individual heat sinks. Thermal compound is applied to the individual heat sinks and the three IC packages.

4 4 von :16 About me Site map 2.1 = changes to Pluto-2 The leads of C64 and C65 have to be bend so that the two capacitors fit into the pcb next to each other. Conclusions HOME ORION PLUTO LX521 Users Group Tweeter high frequency boost R-C network Midrange R-C shelf and notch filter components The three power amplifier IC packages are mounted to an Aluminum sheet metal piece and individual heat sinks. Thermal compound is applied to the individual heat sinks and the three IC packages. The circuit will work without the sheet metal heat sink but the amplifiers can get very hot and shut down protectively at high volume levels. Adding the sheet metal will increase the amplifier reliability and avoid thermal shut-down Digital Photo Processes

5 5 von :16 What's new 2.0" tall heat sink to fit the original PLUTO base 2.75" tall heat sink for the alternative PLUTO-2.1 base The 2.75" height of the metal piece has to reduced to 2.0" to fit the PLUTO base Electrical test chart

6 6 von :16 Input voltages greater that V at 10 khz and above will cause clipping at TP9.

7 von 11 19.12.2012 10:16 The input to output frequency response without the drivers connected and measured with a 10x attenuator is the most important description of the electronic module.

7 7 von :16 The input to output frequency response without the drivers connected and measured with a 10x attenuator is the most important description of the electronic module. It should match within +/-0.5 db. The spot frequency checks with the table above are primarily intended to find errors in construction. C - Alternative cabinet construction A larger base for easier access to the electronic module and improved heat transfer from the power amplifiers may be desirable. Also the rubber coupler for mounting the woofer/midrange driver can be replaced by a ring of wood slats that are screwed into a standard 4" pipe coupler.

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9 von 11 19.12.2012 10:16 Place a strip of 3/8" wide and 3/16" thick foam tape as gasket under the woofer/midrange basket rim before screwing the driver to the ring of wood slats.

9 9 von :16 Place a strip of 3/8" wide and 3/16" thick foam tape as gasket under the woofer/midrange basket rim before screwing the driver to the ring of wood slats. The 4" pipe should be stuffed uniformly with 200 gram of Acoustastuf. When upgrading from an existing Pluto-2 it is not necessary to remove the driver to add stuffing material since the audible effect is minimal. Check for air leakage by applying a 10 Hz, 10V signal to the woofer/midrange speaker cable. If you hear puffing noise, then find its location and seal the leak with GE Silicone II Household Glue. There should be a pin hole leakage path left open so that the cone comes slowly back out, when slowly pushed in. The maximum amount of stuffing material in the pipe behind the tweeter is not critical, but should be at least as specified. Part Name Material Size (inch) Quantity A Top & Bottom plate 3/4" plywood 10.5 x B Legs 3/4" plywood 5.5 x 2 4 D Amplifier Mounting plate 1/4" plywood 10.5 x E Front trim plate 1/8" hardboard 8.25 x 3 1 G Side trim plate 1/8" hardboard 10.5 x 3 2 C Pipe bracket 5/16' plywood 3 x 1-3/8 4 F Pipe bracket base 3/4" plywood 3 x 1-7/8 1 P Barrel plate 1/2" plywood 4 x 1-3/8 12

10 von 11 19.12.2012 10:16 S 4" Pipe Coupler ABS or PVC 5" outside diameter 1 K Woofer pipe 4" ABS or PVC 27" long, 4.5" OD 1 L Tweeter pipe 1 1.5" ABS or PVC 30" long 1 H 1.

10 10 von :16 S 4" Pipe Coupler ABS or PVC 5" outside diameter 1 K Woofer pipe 4" ABS or PVC 27" long, 4.5" OD 1 L Tweeter pipe 1 1.5" ABS or PVC 30" long 1 H 1.5" PVC Pipe coupler PVC 3" long 1 J Coupling insert 1.5" ABS or PVC 2" long 1 M Tweeter pipe 2 1.5" ABS or PVC 4.25" long 1 The internal height of the base is 3.5". Mounting plate for the electronics Note that the electronic module described under B above works correctly also for the alternative cabinet construction. Introduction Specifications Construction Electronics Supplies Photos PLUTO+ Pluto-2.1

11 11 von :16 What you hear is not the air pressure variation in itself but what has drawn your attention in the two stream s of superim posed air pressure variations at your eardrum s Last revised: 11/10/ LINKWITZ LAB, All Rights Reserved

Finding the Prototype for Stereo Loudspeakers

Finding the Prototype for Stereo Loudspeakers The following presentation slides from the AES 51st Conference on Loudspeakers and Headphones summarize my activities and observations for the design of loudspeakers