The speaker cone enclosure of the passive radiators is also sealed so, nothing can get into the speaker from the sides. The front part of the passive radiators seems to be made of aluminium with circular grooves similar to a vinyl record.
The R9 speaker supports the basic Bluetooth protocol (A2DP); hence no aptX, SBC or AAC support, which improves the audio quality over bluetooth and minimizes audio lag when watching videos. Depending on the use, not having aptX or AAC support on a speaker is not necessarily a deal breaker. If you plan to mostly use the Mpow Soundhot R9 speaker for streaming audio outdoors, basic Bluetooth transmission will do just fine and, in fact, be better since basic bluetooth consumes less power than advanced bluetooth codecs such as AAC or aptX.
Without having that amount of speakers, it's impossible to tell how well PartyCast mode works with 100 speakers connected and whether there is any syncing issues or not. One thing for sure about PartyCasting is that it does not support automatic re-connection (like TWS mode does); hence once you disconnect the speakers from PartyCast mode you would have to manually re-connect each speaker. Both TWS and PartyCast is "open" technology so, it's not exclusive to a specific manufacturer. That said, the Mpow R9 seems to be one of the few PartyCast speakers that supports both TWS and PartyCast. Also, similar to TWS mode, PartyCast doesn't currently offer multi-product compatibility; hence you can only connect the same speaker model.
The Soundhot R9 speaker also integrates an omnidirectional microphone, which is embedded within the woven fabric. The microphone has a similar performance to a speakerphone so, it can pick up your voice from different sides without being close to the unit. The microphone uses a noise filtering algorithm to filter as much background noise without compromising the audio quality which is good for a clear conversation. Speaking of the microphone, during an incoming call you will hear a Mandarin voice prompt, followed by the standard incoming call ringtone. The addition of this voice prompt seems a bit odd, especially since it's non-English.
As far as sound, the Mpow R9 dual speakers have very high sensitivity so, they deliver superb audio dynamics, allowing you to really (really) crank up the volume. The sound signature is fairly neutral at 50% volume but as you increase volume level, the treble particularly becomes more prominent than the bass. At about 60%, you can get good bass level with clear vocal midrange. Battery life is also good at around 16 hours runtime at 50% volume and 9 hours runtime at 90% volume. You may notice some distortion at 100% max volume.
In all, the R9 speaker is a good all-rounder although it doesn't feature a powerbank option, which for its size, it probably should since a smaller audio solution like the M30 Plus charging case has a power-out function for charging external devices. The only accessory included is an unbranded USB-C to USB-A cable. You can buy the Mpow Soundhot R9 from Amazon. 
In all, the R9 speaker is a good all-rounder although it doesn't feature a powerbank option, which for its size, it probably should since a smaller audio solution like the M30 Plus charging case has a power-out function for charging external devices. The only accessory included is an unbranded USB-C to USB-A cable. You can buy the Mpow Soundhot R9 from Amazon. 
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