Hello, I would like to ask for help and advise with my first speaker design.
My goals:
Choosen drivers:
Scan-Speak Discovery D2604/833000 with WG PCT-300/WG-300
Dayton audio RS180-4
Baffle desing based on Mr. Heissmann Cinetor Cinetor-Evo, Monitor | Home theater speakers
To meet the goal to keep internal volume under 10l, I want to use capacitor tuning like in this project: http://www.humblehomemadehifi.com/download/Humble Homemade Hifi_Black Box.pdf
Volume needed for woofer based on WinIsd is 5,5l for Qtc 0,988.
My crossover in vituix for choosen drivers based on traced SPL graph from test: Test Scan-Speak Discovery D2604 / 833000 with Waveguide and FRD and ZMA files from Dayton.
I've tried to keep crossover point as low as possible cause that nasty double peak breakup of woofer. Thanks to low fs of tweeter 475hz it should be possible but I'm not certain. I will redo crossover once I will measure drivers when I buy them.
My questions:
My goals:
- Small on wall HT sealed sattelite with internal volume under 10l
- bass extension 60hz so I can cross it with sub somewhere between 80-120hz
- at least 85db sensitivity
- wide sound sound dispersion and good of axes
Choosen drivers:
Scan-Speak Discovery D2604/833000 with WG PCT-300/WG-300
Dayton audio RS180-4
Baffle desing based on Mr. Heissmann Cinetor Cinetor-Evo, Monitor | Home theater speakers
To meet the goal to keep internal volume under 10l, I want to use capacitor tuning like in this project: http://www.humblehomemadehifi.com/download/Humble Homemade Hifi_Black Box.pdf
Volume needed for woofer based on WinIsd is 5,5l for Qtc 0,988.
My crossover in vituix for choosen drivers based on traced SPL graph from test: Test Scan-Speak Discovery D2604 / 833000 with Waveguide and FRD and ZMA files from Dayton.
I've tried to keep crossover point as low as possible cause that nasty double peak breakup of woofer. Thanks to low fs of tweeter 475hz it should be possible but I'm not certain. I will redo crossover once I will measure drivers when I buy them.
My questions:
- 1. The main concern 1400hz crossover is almost 3 times of tweeters fs, but is it enough? Should I go higher?
- 2. What do you think of my crossover. Is that peak around 4200hz problem?
- 3. What do you think of capacitor tuned box? Is there some problem that I overlooked?
- 4. Will I be really able to hit over 85db like vituix show?
- 5. I also want to build my d-class amp from ICEpower modules. Based on WinIsd simulation anything above 54 watts will push woofer to excursion. How much power do I need 100 watt amp or 200?
- 6. Also little bit of topic. Is 60hz low enough for 80hz crossover with sub? I've read on audioholics forum that half octave below is enough.
Attachments
Here's some additional information on the topic which may be of interest to you.
Subwoofer Tuning with Capacitor And Resistor
http://sbacoustics.com/18/wp-content/uploads/2018/05/Capacitor-Tuning.pdf
At least, I will have given your thread a nudge! 🙂