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Hello TechTalk!
Due to natural disaster I have the "opportunity" (excuse) to build an all new HT system. I wanted to share the project with PE-TT because I am a long time PE customer and would like others to be able to repeat this for personal use if it turns out as well as planned.
The plan is a "basic" 5.1 system.
Goal for the main and surround speakers is a compact direct radiator bookshelf speaker able to play reference levels at the listening position from any single speaker in the system (~105dB) without the need of esoteric dedicated amp separates. The plan is to do a complete build using manufacture supplied data, then eventually measure the completed speakers to see how close the simulation is to reality.
I am using the Celestion TF0818 8" midbass driver, the Vifa DX25 1" dome tweeter, and a UM10-22 for the subwoofer. Amplification will be from a Denon 3313CI and Crown XLS1000 for the sub.
The bookshelf speakers are 10" W x 14" H x 12" D. I am building them from chinese 23/32" "cabinet grade" 10-ply pine. At $38 per 4x8' sheet I couldn't convince myself to go with something more extravagant. For the money this stuff seems very nice, voids are few and far between (not enough for me to be concerned about it).
This project has a lot of things incorporated I have never done before:
The TF0818 will be asked to dig to ~80hz. A 3" precision port will be basically glued flare-to-flare to achieve this. Port will be mounted on the back.
Hornresp was used to simulate the low frequency range with the flared port:
HornResp was also used to simulate the low range impedance.
SPLtrace was used to produce frd and zma files from the manufacture supplied data.
"Edge" was used to simulate the effects of the baffle at the design-axis response. The uncorrected simulation was exported and converted to a useful frd for crossover simulation.
"Boxsim" was used to simulate the driver minimum phase for each driver.
LibreOffice Calc was used for a lot of the manipulation and splicing of the files generated by these various programs that is required to get them into a standard frd and zma files for crossover simulation.
Speakerworkshop was used to "compile" all of the data produced above, and simulate a crossover.....
Due to natural disaster I have the "opportunity" (excuse) to build an all new HT system. I wanted to share the project with PE-TT because I am a long time PE customer and would like others to be able to repeat this for personal use if it turns out as well as planned.
The plan is a "basic" 5.1 system.
Goal for the main and surround speakers is a compact direct radiator bookshelf speaker able to play reference levels at the listening position from any single speaker in the system (~105dB) without the need of esoteric dedicated amp separates. The plan is to do a complete build using manufacture supplied data, then eventually measure the completed speakers to see how close the simulation is to reality.
I am using the Celestion TF0818 8" midbass driver, the Vifa DX25 1" dome tweeter, and a UM10-22 for the subwoofer. Amplification will be from a Denon 3313CI and Crown XLS1000 for the sub.
The bookshelf speakers are 10" W x 14" H x 12" D. I am building them from chinese 23/32" "cabinet grade" 10-ply pine. At $38 per 4x8' sheet I couldn't convince myself to go with something more extravagant. For the money this stuff seems very nice, voids are few and far between (not enough for me to be concerned about it).
This project has a lot of things incorporated I have never done before:
- Plywood construction! (only ever done unfinished MDF boxes in the past)
- Nearly all-glue construction (no wood screws or visible fasteners holding the box together).
- The front baffle will be drawn on to to the front of the box from the inside (reach in from the back of the box) using machines screws. Threaded inserts will be installed in blind holes on the rear of the front baffle to accomplish this. The front baffle will be removable for service or changes. The only visible fasteners on the front of the box will be those holding the drivers onto the baffle.
- The rear baffle is "drawn in" to a rear pocket of the cab for aesthetic reasons, and will also be held in place with machine screws and threaded inserts.
- I am excited to have a nice wood grain speaker. I intend to sand/stain/seal them at a later date.
The TF0818 will be asked to dig to ~80hz. A 3" precision port will be basically glued flare-to-flare to achieve this. Port will be mounted on the back.
Hornresp was used to simulate the low frequency range with the flared port:
HornResp was also used to simulate the low range impedance.
SPLtrace was used to produce frd and zma files from the manufacture supplied data.
"Edge" was used to simulate the effects of the baffle at the design-axis response. The uncorrected simulation was exported and converted to a useful frd for crossover simulation.
"Boxsim" was used to simulate the driver minimum phase for each driver.
LibreOffice Calc was used for a lot of the manipulation and splicing of the files generated by these various programs that is required to get them into a standard frd and zma files for crossover simulation.
Speakerworkshop was used to "compile" all of the data produced above, and simulate a crossover.....
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