Single driver design that excels in the human voice range

Jdiesel87 · 14th January 2021, 05:23 PM

I was thinking of undertaking a new project with the goal to produce a no-compromise single mono Bluetooth speaker to play audiobooks and podcasts. I want something that does a great job of naturally reproducing the male and female speaking voice with everything else not being important.

I'm thinking of doing some type of omni-directional or di-pole design where the speaker can be placed flexibly in a room and not have the listening sweet spot limited to a small location.

Anyone have ideas or suggestions to get me rolling on this idea?

Jim Griffin · 10:05 PM

An overkill for you may be a constant beamwidth transducer (CBT) array that would meet your wide room sized sweet spot desire. The technology comes from Don Keele Jr. the famous long time loudspeaker pioneer in the field.

My Modified CBT24 arrays were derived from Don's work and have exceptional in-room performance. See my journey at:

My New Line Array--It's a Modified CBT24

Jim

nigelwright7557 · 14th January 2021, 10:31 PM

Fane 12-250TC would be my choice.

Nikolas Ojala · 14th January 2021, 11:06 PM

Resistance / aperiodic enclosure. A very simple and small box with an acoustic resistance vent. Something like this: US2065751A - Acoustic resistance device
- Google Patents

You could use Dynaudio / ScanSpeak Variovent or construct a similar device by yourself.

Driver:
QTS < 0.45
SPL ≈ 90 dB
Single cone design.

I don't know what kind of amplifier you would use, but in case you chose low voltage and class AB, then low impedance ( 4 Ω or less ) and high efficiency would be desirable properties for the driver.

With an aperiodic speaker enclosure you could also use current-drive with an amplifier like this: Current Drive

Or if you wish to make a class D amplifier, then perhaps something like this: US7924091B2 - Class-D transconductance amplifier
- Google Patents

You want the speaker omnidirectional, so make the driver shout down and place a conical mirror below to spread sound. I think that would be the natural way to prevent the driver collecting dust.

More about omnidirectional speakers: Omnidirectional speakers

chris661 · 15th January 2021, 11:55 AM

Quote:

Originally Posted by nigelwright7557

Fane 12-250TC would be my choice.

Having heard that exact driver, I'd veto that. Rough in the kHz range, and wants a really big box.

To the OP, the SB65 is pretty good. Maybe use it up-firing with a small conical deflector to get it towards omni.

Chris

nigelwright7557 · 15th January 2021, 11:57 AM

I have a pair in a small box here that sound very good.
I wouldn't have recommended it otherwise.

scottjoplin · 15th January 2021, 12:17 PM

Well, there's no arguing with that.

freddi · 15th January 2021, 07:41 PM

- might cram a 12-250TC into a 40 liter closed box

planet10 · 15th January 2021, 08:20 PM

These are the best speakers i have heard for voice. Drivers come in pairs so a bi-pole/omni-pole could be devised. I would look to a castle-stle arrangement of drivers.

1^st thot woud be the mMar-Ken6pT box, same shape, 2x as big) one on the front, one on the top of this box drivers wired in series):

http://www.planet10-hifi.com/planset...nts-030218.pdf

dave

pelanj · 15th January 2021, 08:32 PM

FaitalPro 3FE22/25 are realy great and sensitive.

14th January 2021, 05:23 PM	#1
Jdiesel87 diyAudio Member Join Date: Sep 2014	Single driver design that excels in the human voice range I was thinking of undertaking a new project with the goal to produce a no-compromise single mono Bluetooth speaker to play audiobooks and podcasts. I want something that does a great job of naturally reproducing the male and female speaking voice with everything else not being important. I'm thinking of doing some type of omni-directional or di-pole design where the speaker can be placed flexibly in a room and not have the listening sweet spot limited to a small location. Anyone have ideas or suggestions to get me rolling on this idea?

14th January 2021, 10:02 PM	#2
Jim Griffin diyAudio Member Join Date: Jun 2003 Location: Tennessee	An overkill for you may be a constant beamwidth transducer (CBT) array that would meet your wide room sized sweet spot desire. The technology comes from Don Keele Jr. the famous long time loudspeaker pioneer in the field. My Modified CBT24 arrays were derived from Don's work and have exceptional in-room performance. See my journey at: My New Line Array--It's a Modified CBT24 Jim Last edited by Jim Griffin; 14th January 2021 at 10:05 PM.

14th January 2021, 10:31 PM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Fane 12-250TC would be my choice. __________________ 2021 versions of PCBCAD51 and PCBCAD720 out now >>> https://www.murtonpikesystems.co.uk

14th January 2021, 11:06 PM	#4
Nikolas Ojala diyAudio Member Join Date: Aug 2004 Location: Finland	Some ideas Resistance / aperiodic enclosure. A very simple and small box with an acoustic resistance vent. Something like this: US2065751A - Acoustic resistance device - Google Patents You could use Dynaudio / ScanSpeak Variovent or construct a similar device by yourself. Driver: QTS < 0.45 SPL ≈ 90 dB Single cone design. I don't know what kind of amplifier you would use, but in case you chose low voltage and class AB, then low impedance ( 4 Ω or less ) and high efficiency would be desirable properties for the driver. With an aperiodic speaker enclosure you could also use current-drive with an amplifier like this: Current Drive Or if you wish to make a class D amplifier, then perhaps something like this: US7924091B2 - Class-D transconductance amplifier - Google Patents You want the speaker omnidirectional, so make the driver shout down and place a conical mirror below to spread sound. I think that would be the natural way to prevent the driver collecting dust. More about omnidirectional speakers: Omnidirectional speakers __________________ High-order harmonics are more offensive than low. — D.E.L. Shorter: "The Influence of High-Order Products in Non-Linear Distortion". Electronic Engineering, April 1950.

15th January 2021, 11:57 AM	#6
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I have a pair in a small box here that sound very good. I wouldn't have recommended it otherwise. __________________ 2021 versions of PCBCAD51 and PCBCAD720 out now >>> https://www.murtonpikesystems.co.uk


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15th January 2021, 12:17 PM	#7
scottjoplin diyAudio Member Join Date: Dec 2015 Location: Penrhyndeudraeth	Well, there's no arguing with that.

15th January 2021, 07:41 PM	#8
freddi diyAudio Member Join Date: Aug 2005	- might cram a 12-250TC into a 40 liter closed box

15th January 2021, 08:20 PM	#9
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III	These are the best speakers i have heard for voice. Drivers come in pairs so a bi-pole/omni-pole could be devised. I would look to a castle-stle arrangement of drivers. 1^st thot woud be the mMar-Ken6pT box, same shape, 2x as big) one on the front, one on the top of this box drivers wired in series): http://www.planet10-hifi.com/planset...nts-030218.pdf dave __________________ Stay safe. Stay home. Respect the 2m bubble.

15th January 2021, 08:32 PM	#10
pelanj diyAudio Member Join Date: Jul 2008	FaitalPro 3FE22/25 are realy great and sensitive.

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