After some time I finally won to replace my Ninsheng BY model with a better model that has not the quasi 3D sound. As noted there the previous model and its 'house siblings ' have the common of "spatializing" the sound into 3D and enhancing the basses and the middles. That means making a head full of low freq sounds and make me crazy !
This new model coded as HP31 comes with very nice design includes the same features: cabled and wirless connectivity , SD card reader FM radio and microphone.
This is now the nicest model i have. It comes with aluminum blade as armature of ca 3 cm in eash side very nice color a. It is the flagship model of the Bluetooth of the companys headphone models .
As you can see the blade is around 3 cm and relatively big speaker that is over the ear. Nice leather like isolation over all the arm and mid heavy for just 200 grams
Hmm just 1 gram lower than 200! It doesn't matter so much
In contrast with the other models the P31 has only 3 buttons with enhanced operations. the middle button powers on and off, stop music , while the two others do 2-3 operations : change the mode of operation , scan the radio, control the volume and jump to the next /previous song
and the SD card slot
In order to pick it the seller left me also check between a few company models company before picking it . The sound is quite bassy but with rich trebles and cross checked at the same time with mine AKG81DJ which has a bit narrower sound range(above the 10kHz part ) using the Q3 Tescun player recorder with test songs !!
As with most typical Bluetooth models tested. HP31 has quite deep basses that extend a bit to the normal voice band with audio range that covers up to 20 kHz A that is an extended U type curve with narrow lows.
Its most important feature excludes 3D sound ! This is the reason i took them! I now feel much better listening for indefinite time.
Interesting to notices the voices frequencies are more linear than in Bluetooth mode
In SD card mode the sound is very close to the Bluetooth curve
Tested with the mini transmitter and the latency is around 0.2 seconds this is possibly due to the transmitter latency . use also with the digital TV receiver with very good audio.
Cross Checked with Awei :more trebles NO 3D sound !
With my laptop : the laptop sound is unfortunately quite bassy but the results are OK and can be used for long time listening. Tested in stream radio and in Youtube and is heard very well The same with remote radios from the Kiwi Net used by radio listeners and radio amateurs. This model can replace my standard headphone Sennheiser HD493 used since mid 2000s in other gear . The HD493 was repaired the last month but the technician damaged its sound linearity and i feel it now as also 3D
This is the typical options when he headphones are paired. IN headset mode the sound is heard monophonic
IN the bottom of the control panel there is a typical 3.9mm stereo audio socket.
The above audio by amplitude
Distance range with BT gear
It can connect up to 7 meters with half meter wall
Around 12 meter direct length
Radio: The only drawback as with other models which produce monophonic sound and poor reception. I think that if the radio could have a terminal to touch the metallic armature the reception could be quite better for sure!
SD operation : It plays all standard audio formats : WAV MP3 and WMA .Sound is quite bassy as in Bluetooth mode. Changing files is a bit awkward with continuous use of the next back buttons for 1-2 seconds to select the song in sequence, It does not play songs in the exact sequence.
Battery : this is its worst point . its battery lasts only 3 hours as tested so . Upon that i returned back to the seller the headphone only for a item only change but they denied. This company is bond "to their protocol" or the typical procedure disregarding to adapt to the reality As therte is no space in the house i always litter the box and separate all the accessories just in the case they will be used. I use it alone with my standard accessories in a bag. its very possible that this battery will be expired very soon.
Its funny that after charging it to the full for 3 times without using it after , it operated for 5.5 hours continuously and still having more in its battery...It finally lasted 6 hours.
Verdict :8/10 it has a very good though bassy sound with the most typical features of its category . Very nice ergonomics and design Its main use ids for remotely listening various TV programs
Addition post-21 and 22
using it in another home with irregular shape and a fireplace in the middle reception was very problematic , with self-cancellation of signal while moving the head acrross the room wall
Just think a room of ca 6m long x5 m with a space of 2x2 missing in the right part (entrance ) . Inthe left part of the room there is a fireplace of 1.5x1.5 m in the middle of the room. This is what i can suspect making propagation self cancellations : the fireplace and the design of the whole saloon
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