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The firm intends to charge a fee for the feature, with each voice costing $0.99 (80p).
The company has also refreshed its range of Echo speakers, adding a larger high-end version with Dolby Atmos for "3D sound".
Amazon is the world's best-selling smart speaker brand.
However, that position is being challenged by Chinese companies including Baidu, while Google is also expected to unveil new gear of its own next month.
Smart speaker shipments
| Brand | Devices year-to-June 2019 | Year-on-year change | Market share in Q2 |
|---|---|---|---|
| Amazon | 28.8 million | 34.2% | 25.4% |
| 22.5 million | 23.3% | 16.7% | |
| Others | 47.6 million | 298.7% | 57.9% |
| Total | 99.0 million | 91.5% | 100.0% |
The company has also extended its Echo range into a selection of wearable tech for both humans and pets for the first time.
The new devices include:
- Echo Frames - a pair of titanium-framed glasses that vibrate to provide notifications, and have built-in microphones and speakers to use Alexa, but no display
- Echo Buds - a pair of wireless Bluetooth earbuds that feature noise-reduction tech, giving them an edge over Apple's Airpods, and which can activate the firm's virtual assistant by voice alone, unlike other Alexa-enabled headphones
- Echo Loop - a ring that features two microphones and a "tap-on" button, which allows owners to record messages and send them to an Echo smart speaker
- Fetch - a pet tracker designed to attach to a dog collar
"This avalanche of new products underlines Amazon's desire to extend Alexa's reach to every part of people's lives - be that in the home, or on the move via new Echo Buds or in the car through the deal with General Motors," commented Geoff Blaber, an analyst at CCS Insight.
"Not only will it will strengthen Amazon's reach with existing customers that use Alexa-powered products, it will also provide the opportunity to woo more consumers to embrace its increasingly ubiquitous voice assistant."
Amazon's pet tracker will use a new wireless data-transfer technology to let owners monitor their dog from up to 500m away
Sound boost
Amazon said it would use a "neural text-to-speech" engine to mimic celebrities' voices on Alexa-powered devices. It will use recordings the stars provide as the basis for other computer-generated utterances.
Samuel L Jackson's voice will be offered in both a "clean" and an "explicit" mode for Alexa
In the case of Avengers actor Samuel L Jackson, consumers will be given the choice of whether they want a version that swears or not.
The firm said other famous stars - who will be paid for their services - will follow.
Amazon recently announced it was upgrading its music streaming service to a "high definition" format to help its fortunes.
Its new Studio speaker should provide users with a means to appreciate the extra detail it offers. Like Sonos' kit, it fine tunes its sound to suit the acoustics of the room it is placed in.
And two of the $200 (£190 in the UK) speakers can be paired and connected to a Fire TV stick or television to create a home theatre experience.
"Amazon has never really had a smart speaker which was marketed specifically for its audio quality, in the manner of an Apple HomePod or a Google Home Max," commented Ben Stanton from the tech consultancy Canalys.
"Typically, third-parties like Harman and Sonos would be the ones to differentiate in this space on Amazon's behalf.
"If it [lives up to its promise], it will cannibalise these third-party products, and leave little room left for third-party smart speaker vendors to innovate."
Amazon's stock closed the day 1.5% higher, while shares in Sonos sank 5% lower.
Privacy worries
Amazon's devices chief Dave Limp addressed users' privacy concerns early on during the launch event at the firm's Seattle headquarters, even showing a tweet it had received complaining about one of its speakers activating without the trigger word "Alexa" being uttered.
"We care about this," he said.
"Privacy is absolutely foundational to everything we do in and around Alexa."
Mr Limp showed a tweet in which a British father-of-three had expressed concerns about Alexa
He highlighted the fact that users can now command a device to delete everything they have said that day. In addition, the firm recently added an option to its Alexa app to let users opt out of having their voices transcribed by humans to improve the service's accuracy.
However, some of its rivals - including Apple and Google - have gone further by requiring their users to opt in to similar programmes.
"Privacy is a huge issue for all technology manufacturers and recent revelations show that Amazon is vulnerable," commented Adam Simon from the market intelligence firm Context.
"All our research shows that it is a major concern to consumers.
"Yet, ironically, it is not the most important barrier preventing people buying smart home products. Privacy is far outweighed by lack of understanding, lack of perception of value, and lack of good use cases."
He added that later this year, users will be able to ask Alexa "why did you do that?", to question it about unexpected behaviour.
Furthermore, a new setting will allow them to set recordings to be auto-deleted after a set period of time ranging from three to 18 months.
Amazon said it decided to launch a smart oven after its previous Alexa-enabled microwave became a bestseller
Other announcements included a new 8in (20.3cm) Echo Show smart display, which can now show group video calls with several people on-screen at once.
It features the same "high definition" screen resolution as the 10in model, but only a one megapixel camera versus the 5MP sensor in the larger device.
That means it will likely never add the kind of auto-framing feature that Facebook's Portal and Google Nest Hub Max video chat devices offer, which is achieved by cropping into the image.
The Echo Show 8 has similar quality speakers but a lower resolution camera than the older Echo Show (2nd Gen)
Other new kit included:
- a small version of its smart speaker that plugs directly into the wall and features a port into which owners can plug accessories such as a motion sensor or a nightlight, called the Echo Flex
- an internet-connected lamp that can change colours in time with music, called the Echo Glow
- a voice-controlled smart fan oven, which can also cook food via microwaves or an oil-based "air-fryer". It can be paired to a smartphone to allow users to scan packaged foods' barcodes to set the device to cook them at the appropriate temperatures for the recommended amount of times
- a new wireless protocol called Sidewalk, which can connect devices up to 500m (0.3 miles) away - giving it an advantage over Bluetooth and wifi - but uses less power than a 4G or 5G data link
Mr Limp also announced changes to its Ring-branded smart doorbells.
These will now gain use of Alexa, including a service that will allow visitors to record a message if the owner is out and unable to answer remotely via the device's app.
He also unveiled new Ring hardware including a security camera for inside the home - which will compete against Google's Nest Cam as well as similar products from Hive and Canary - and a "retrofit" kit that adds smart features to existing alarm systems.
