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4 Year Home Audio & Video Protection Planfrom Asurion, LLC
- Covers failures due to power surge and other mechanical and electrical breakdowns.
- No deductibles or hidden fees. Shipping included on all repairs. Fully transferable.
- Easy claims process online 24/7. If we can't fix it, we will send you an Amazon e-Card reimbursement for your product purchase price.
- Plan term and select coverage begins date of purchase and is inclusive of the manufacturer's warranty. All other coverage begins after the manufacturer's warranty expires. Plan is fully refunded if canceled within 30 days.
- Plan contract will be emailed from Asurion within 24 hours of purchase. This will not ship with your product.
TROND Bluetooth V4.1 Transmitter Receiver, 2-in-1 Wireless 3.5mm Audio Adapter, AptX Low Latency, Smart Codec Indicator, 2 Devices Simultaneously, for TV, iPod, Home Sound System
- APTX & APTX LOW LATENCY SUPPORTED. Powered by premium CSR8670 chipset, TROND BT-DUO S not only supports the latest Bluetooth V4.1, but also adds aptX & aptX Low Latency to both the TX and RX modes. With aptX, you can enjoy CD-quality sound wirelessly over Bluetooth connections with aptX-source devices like TV’s, phones or tablets; with aptX Low Latency, you can now watch video while listening to wireless audio in a synchronized fashion AND without any noticeable audio delay
- TX MODE: BLUETOOTH TRANSMITTER. By plugging TROND BT-DUO S to your non-Bluetooth audio sources (TV, iPod, Kindle e-Book reader or Nintendo Switch/3DS), you can enjoy high quality music wirelessly or listen to late night shows without disturbing your family members on your Bluetooth headphones or speaker. Please also order TROND TD-BH01 Over-Ear Bluetooth V4.2 Headphones (ASIN: B075VLWPXF) for the best low latency performance
- RX MODE: BLUETOOTH RECEIVER w/ VOLUME CONTROL. TROND BT-DUO S can upgrade your old wired headphones (such as Bose QC25/QC15) or speakers into wireless with the support for aptX Low Latency. Its volume/track buttons allow you to play/pause music, turn volume up/down, and select track forward/backward. (NO hands-free calling due to lack of microphone; cannot be powered up automatically while you start the car ignition)
- PAIR WITH TWO & SMART CODEC INDICATOR. In TX mode, TROND BT-DUO S can pair to two Bluetooth Headphones, and streams audio to both simultaneously. However, in this application, the codec will be downgraded to from aptX Low Latency to SBC. It can also tell you which codec is in place by displaying different LED status. The blue LED blinks once every 10 seconds for SBC, blinks twice for aptX, and blinks three times for aptX Low Latency
- What You Get: TROND BT-DUO S 3.5mm Bluetooth V4.1 Transceiver with aptX Low Latency, 3.5mm male to 3.5mm male aluminum audio adapter, 3.5mm male to 3.5mm male audio cable (50cm extra-long), 3.5mm female to RCA male audio cable, USB to micro USB charging cable, user manual in English, 18-MONTH TROND warranty & 30-DAY money back guarantee
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- Bluetooth Compliance: Bluetooth V4.1, CSR 8670 chipet, A2DP
- Working Range: up to 33ft / 10m
- Supports: Dual Stream (TX mode); Multi-Point (RX mode)
- Codec: APT-X LL(TX/RX), APT-X(TX/RX), SBC(TX/RX)
- Working Time: about 10 hours
- Charging Time: 2 hours / 5V; working while charging
- Dimension: L 55 x W 38 x H 10.5 mm / 2.17 x 1.50 x 0.41 in
- Net Weight: 17.2 g / 0.61 oz
Tips Before Using:
- Switch to the right working mode (TX or RX) before powering on. As a transmitter (TX), it should pair to receiving devices, such as Bluetooth headphones or speaker. As a receiver (RX), it should pair to transmitting audio sources, such as your phone or tablet. You can't pair two transmitting devices or two receiving devices together;
- If you want to use it as a transmitter and connect to your TV, please refer to the user manual of your TV and find the right AUDIO OUT port (3.5mm or white/red RCA), instead of any VIDEO or AUDIO IN ports. If your TV only offers the digital optical audio out port, please order another model instead: TROND BT-DUO X;
- Your wireless headphones or speakers also need to support the codec of aptX Low Latency in order to reduce the audio latency to 40ms. Otherwise, the codec will be downgraded to aptX or even SBC;
- If TROND BT-DUO S gets stuck and all the buttons stop working properly, please press & hold the MFB, and plug in the external USB charger to shut down BT-DUO S. Please note that this operation won't delete the previous pairing record;
- If you'd like to delete all the pairing record, please refer to the section of "Frequent Asked Questions" at the end of the user manual for how to reset TROND BT-DUO S.
- TROND BT-DUO S doesn't have the built-in microphone and hence doesn't support phone calls;
- You can use TROND BT-DUO S either as a transmitter OR as a receiver. This adapter won't be able to transmit and receive audio at the same time;
- The latency of 40ms is still unacceptable for live sound monitoring. Therefore, those who plan to use it with electric paino or guitar, beware! Bluetooth technology, even with aptX Low Latency, may not suit your needs;
- We wouldn't suggest you using TROND BT-DUO S in the transmitter mode to pair with your car Bluetooth system, as some cars require entering a certain pin code for pairing and TROND BT-DUO S doesn't have the keypad for you to enter the pin code;
- If you have any difficulty in pairing with your Bluetooth headphones or speakers, please always feel free to reach us for the technical assistance.
Mode I: Bluetooth Transmitter (TX)
TX Application: switch to "TX" mode, connect it to the audio OUT port of your non-Bluetooth audio source, such as TV, iPod, CD-player, Amazon Kindle or Nintendo Switch/3DS, and then pair it with your wireless headphones. Start enjoying music, watching video or playing games without disturbing someone next to you.
No Lip-Sync Delay: with aptX Low Latency, it can effectively minimize the audio delay, which allows you to watch late night TV shows in a synchronized way. Please order "TROND TD-BH01 Over-Ear Bluetooth V4.2 Headphones" for the best low latency performance.
Dual Stream: TROND BT-DUO S can pair up to two Bluetooth audio devices simultaneously, and streams audio to both of them. However, in this case, the codec would be downgraded from aptX LL to SBC. Please order TROND BT-DUO II transmitter if you'd prefer aptX LL for both two devices.
Mode II: Bluetooth Receiver (RX)
RX Application: switch to "RX" mode, connect it to the audio IN port of your wired audio device, such as wired earbuds, speaker or car stereo via 3.5mm cable, and pair it with Bluetooth-enabled audio sources such as your smartphone, tablet or laptop. This way, you could enjoy high-quality music wirelessly without spending more to order Bluetooth headphones or speaker.
AptX Low Latency: unlike most other 2-in-1 transceivers which don't support aptX LL or aptX in the receiver mode, TROND BT-DUO S is ideal for turning your wired headphones, speakers or car stereo into Bluetooth-enabled headphones or speakers with the feature of aptX Low Latency.
Multi-Point: you can pair two smartphones (or tablets) to this receiver simultaneously. However, it can only receive the audio from one phone at a time. You need to pause the music on one phone first in order to play music from the other phone.
More Product Features to Explore
Full Music Control (RX)
By connecting your wired headphones or speaker to TROND BT-DUO S in the receiver mode, you could remotely play/pause music, adjust volume up/down and change track forward/backward by using the volume controlling buttons.
Note: the microphone and the volume/track buttons on your wired headphones or speaker will become inactive once they are connected to the receiver.
Upgraded with Smart Codec Indicator
Be smart, and don't let false advertising fool you. TROND BT-DUO S has been upgraded with smart codec indicator and can tell you which codec is in place, by displaying different LED status after the music starts playing.
Super Long Working Time
DC Mode: Connect to a quality USB charger, and stream the audio as long as you can. You can charge it while it's working;
200mAh Rechargable Battery: TROND BT-DUO S can provide approx. 8-hour battery life, and can be fully recharged within approx. 2 hours. It needs to be recharged ASAP when the LED keeps flashing red. The LED turns steady red while being recharged, and turns off once fully charged.
|Bluetooth V4.1 Transmitter & Receiver||Bluetooth V4.1 Transmitter & Receiver||Bluetooth V4.1 Transmitter & Receiver||Bluetooth V4.1 Transmitter & Receiver||Bluetooth V4.2 Transmitter & Receiver||Bluetooth V4.2 Receiver|
|Codec Supported||SBC, aptX, aptX Low Latency (for both TX & RX)||SBC, aptX, aptX Low Latency (for both TX & RX)||SBC, aptX, aptX Low Latency (for both TX & RX)||SBC, aptX, aptX Low Latency (for both TX & RX)||SBC, aptX, aptX Low Latency, aptX HD (for both TX & RX)||SBC, aptX, aptX Low Latency (for RX only)|
|Audio Connection||3.5mm, RCA||3.5mm, RCA||3.5mm, RCA, digital optical in (TX)||3.5mm, RCA, digital optical in (TX), digital optical out (RX)||3.5mm, RCA||3.5mm, RCA|
|Working Range||10m / 33ft||10m / 33ft||10m / 33ft||10m / 33ft||10m / 33ft||10m / 33ft|
|Power/Pairing Button||one MFB button||one MFB button||one for powering; one for pairing||one MFB button||one MFB button||one switch button for powering and pairing|
|Pair with Two (TX)||✓||✓||Yes, more intuitive to operate than other models||✓||✓|
|AptX Low Latency in Dual Link Mode||no||no||Yes, specially designed for pairing with two BT headsets||no||no|
|Volume + / －||Yes, in receiver mode only||no||no||no||Yes, in receiver mode only||✓|
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So the AptX people developed AptX LL, standing for ‘Low Latency’, a fancy term for low delay. AptX LL delay can be as low as 40 milliseconds (less than half of a tenth of a second), and for TV watching, is almost undetectable. In order to benefit from AptX LL however, you need a source that is transmitting it and a headphone or speaker that is receiving and reproducing it. This is where I think a lot of negative reviews are coming from- if you don’t have AptX LL at both ends, you won’t get any benefit. Since there are only a handful of AptX LL headphones, and no TV or hifi manufacturers have adopted it yet, miniature devices like the DUO S are designed to let the vast majority of existing audio devices take advantage of this technology.
The Trond Duo S provides the most advanced Bluetooth audio experience currently available, and I am very happy with its performance. I bought it specifically to obtain satisfactory wireless headphone listening to my Sony XBR TV. When connected to a continuous source of power via the microsd port, it pairs almost instantly when I turn my headphones on (note many TV’s kill the power to their USB ports when they are turned off, and the Trond will shut off after some time to save the battery, and then need to be turned back on and re-paired when the TV is turned back on, so I would recommend using an old phone charger to power it). I’m using the Avantree Audition Pro, one of the only headphones on the market with AptX LL built in, and the sound is excellent, with negligible delay. The DUO S can also act as a receiver, to turn any pair of headphones with an ⅛” jack into AptX LL wireless headphones, but of course you need two of the DUO’s, one transmitting from the TV or other device and one connected to the headphones.
Finally, I must comment on Trond customer service. This has been by far the most responsive company I’ve done business with in the internet age. We’re talking a $40 device from China. I was not expecting much when I emailed them a question. And yet I have experienced a level of communication that would make Apple envious. My emails were responded to promptly, in detail, by individuals with excellent spelling and grammar who clearly want my experience to be as positive as possible. I originally had some issues with getting the LL version of AptX working with my Avantree Audition Pro’s, and instead of blaming the other company, Trond bent over backwards to get to the bottom of the issue and offer solutions. So 5 stars for Trond customer service as well as the DUO S.
Tx/Rx: TROND Bluetooth V4.1 Transmitter Receiver / Wireless 3.5mm Audio Adapter with aptX Low Latency & aptX for Both TX & RX, Dual Stream and Volume Controller
Rx: TROND 3.5mm Bluetooth V4.2 Audio Receiver Adapter with AptX Low Latency & Volume Control, for Home Stereo, Wired Headphones & Speakers
Both are 5 stars IMO. Here’s what I was looking for and what I found:
Main objective: Use a BT receiver to allow me to use wired high quality headphones (Sennheiser HD650, HD598, HD555 mod to 595) with BT enabled devices (TV, computers, iPhone 7+, iPods and iPads) and secondary objective of using wired headphones with non-BT enabled legacy devices (iPod classic, older TVs)
Why? Good quality BT enabled headphones are expensive and have a limited frequency range (Bose QC35 $349, and Sennheiser HD-1 Wireless $499, 28 ohm impedance, 16-22000 Hz) compared to higher quality headsets (Sennheiser HD650 300 ohm impedance, 10-41000Hz; HD598 50 ohm, 12-38,500 Hz, HD280 64 ohm, 8-25000 Hz). Even though BT has improved up to BT 4.2 and codecs for sound transmission have improved to decrease latency and transmit a broader range of frequencies, it is still cheaper to convert wired headset to BT capability at the inconvenience of managing a dangling cable. I don’t expect the BT transmission to have the same quality as a headphone wired directly to a receiver or iPhone/iPod/iPad
Why did I purchase both?
a. Reviews of many bluetooth (BT) receivers (Rx) used to drive headphones reported lag between video and audio. I wanted the receiver, but if there was going to be lag, then I’d pair the Rx/Tx with the Rx to see if that helped. I looked for low latency drivers.
b. For non-BT devices (old iPod classic, non BT TV, I needed a BT Tx, so a combo Rx/Tx made sense.
What features were I looking for?
a. Volume control on the Rx. Why? because the wired headphones don’t have volume control unless I put a volume control between them and the Rx. Samsung Series 6 600D and Series 7 700D UHDTVs with BT don’t provide volume control using the TV remote; therefore the receiving end of the BT Rx has to control the volume.
b. Most up to date BT 4.1 or 4.2 so that it maintains backwards compatibility with other BT units (not all BT are the same — i.e. my iPhone 7+ can pair to a Jaybird Freedom, but my iWatch series 2 won’t pair with the Jaybird Freedom).
My intended uses:
1. Pair Bluetooth TV to Rx connected to headphone, if there is latency, then connect Rx/Tx to TV RCA outs and pair Rx/Tx to Rx connected to headphone
2. Pair iPads/iPhone/iPod blue tooth to Rx/Tx in Rx mode or Rx connected to headphone
3. Pair Rx/Tx to Rx connected to headphone
Both have the same small form factor, plastic box except the Rx has an on off sliding switch rather than just a single button that has to be held 3 seconds to turn it on. Rx/Tx no sliding on off switch, just a button that has to be held down 3 seconds.
EASE OF CONNECTION:
Charged both fully. Tx/Rx set to Tx and turned on, Rx turned on 1st time and they paired within 5-10 seconds. Tx/Rx goes to solid blue; Rx goes to LED off blinking blue every 10 seconds instead of solid blue to indicate connection. No I can connect any nonBT device (TV, older iPods, iPod Classic) via male to male 1/8” plug to the Tx/Rx set to Tx mode and headphone connected to Rx and I have a functioning BT system. I just wrap the headphone cords up with velcro and put it on one side of the headband … looks geeky but I’m using it for function, not looks.
To set either unit to pair, just double tap the “power button” and they immediately blink red blue red blue until paired. Once paired, Tx/Rx light goes to solid blue, Rx blinks blue every 10 seconds. Even if a connection is active, the double tap “power button” breaks the connection and sets the units to pair mode. Pairing is quick.
Pairing to Samsung 600D, 700D UHDTV is easy. Go to Menu Settings > Audio > Select Speaker > Bluetooth. The Trond unit will show up no screen, select pair and it’s done in 5 seconds. Volume control is on the Trond unit; Samsung remote cannot control volume from TV. NO LATENCY on both TVs to Rx/Tx or Rx. Very nice. Don’t need to implement the Rx/Tx —> Rx method. This gives me a BT Rx for each TV now.
Caveat, iWatch series 2 cannot pair to either Trond Rx/Tx set to Rx mode or Trond Rx. But iWatch series 2 cannot pair to Jaybird Freedom BT earphone. iPhone 7+ pairs to Tronds and Jaybird Freedom BT and work without problems. This seems to be more of a problem with the iWatch than the Trond units.
DROP OFFS and DISTANCE:
Connection good to HDTV BT 30 feet away unobstructed. No drops offs of signal or loss of connection with iPhone in pants pocket and received on opposite side of my head indoors. Haven’t tested outdoors where BT can’t bounce off walls. Intermittent breakup when BT Rx separated from BT Tx by a floor (i.e. receiver on 1st floor, Tx in basement, but of course it gets better when I’m standing 1 floor immediately above the Tx in the basement).
If paired to iPhone 7+ and I turn on the car to which the 7+ is paired, the Trond connection shuts off and the car and 7+ become paired to give priority to car-phone handsfree connection. Trond doesn’t have a speaker and can’t be used for answering calls (which is not what I got this for).
No lag from Samsung UHDTV Series 6 and Series 7 using the TVs BT. No audio-video lag between TV and Trond Rx, iPad and Trond Rx playing movies on Amazon Prime and Youtube.
Sound quality depends upon type of headphone connected to Rx, but the Rx and Rx/Tx can both drive a 300 ohm impedance Sennheiser HD650 without problem. (Avantree Quick Clip reportedly has a hiss and can’t drive anything more than 32 ohm from what I’ve seen on reviews on Amazon).
The sound quality (frequency spread) is not as wide as wiring the HD650 directly to my iPod classic, but it’s almost as good (i.e. like listening to an MP3 at 320 kbps instead of a lossless MP4/M4A at up to 1444 kbps sampling). I use MP4 lossless music files as I can hear the difference in quality between 1444 kbps sampling MP4/WAV and MP3 320 kbps max. I am very satisfied with the BT performance from iPhone 7+ to Trond Rx to HD650, and iPod Classic to Trond Rx/Tx to Trond Rx to HD650. Even though reviews say an HD650 is best used with an external amp, I have been more than satisfied with the performance with an un-ampped HD650 driven by an iPod classic or iPhone 7+ lightning to 1/8” plug given the type of recordings I use (which are much better than the 128 kbps stuff found off of iTunes music store … the stuff that many are satisfied using less refined headsets and earbuds).
Works just fine with the other HD598, HD 555 mod to HD 595, so it should work just fine with anything lesser. Even the slightly truncated sound of the Tx/Rx to HD650 is still better than any of the other headsets. Wired is always better than BT, but BT is getting close. Other specs:
HD280 8-25000 Hz, 64 ohm impedance
HD555 12-38599 Hz
HD598 12-38500 Hz, 50 ohm
HD650 10-39500 Hz, 300 ohm
HD1 16-22000 Hz, 28 ohm; this is Sennheiser’s $499 BT headset
Bose QC35 $349, QC2, QC3 — I can’t find specs on these, but the Trond’s drive my QC3 just fine. Haven’t tested QC2 and of course the QC35 doesn’t need this. In general, Bose headphones tend to muddy the mids and are thus more bass heavy than balanced headphones.
Sennheiser HD700 8-44000 Hz, 150 ohm, $419
Sennheiser HD800 19-44900 Hz, 300 ohm, $990
I’d rather spend my money on an HD700 than on the $499 HD1, so the Trond BT are a workable solution for me. If they can drive the HD650, I’d anticipate it should do just as well with an HD700.
Things I haven’t tested:
I haven’t tried the Rx/Tx bind to two Rx to drive two headphones, but this is what would be needed to drive 2 headsets from one TV. I haven’t tested how week the signal would get from an Rx connected to a 1/8” splitter to drive two headsets.
1. Trond Rx/Tx and Rx are both 5 star.
2. BT pairing is easy, quick and simple.
3. No lag between audio and video from Samsung UHDTV BT to either Trond unit.
4. Trond Rx able to drive 300 ohm Senheisser HD650 without hiss
5. Less cost than the Avantree Quick Clipper Pro and Priva III (which I considered prior to purchasing these). Reportedly the Clipper can’t drive anything >32ohm per specs.
If you don’t need a BT Tx, then I’d just buy the $20 Trond BT Rx. If you want flexibility, then get the Trond BT Rx/Tx with volume control which are $37 as of 3/20/2017. Even though iPhone and iPod Classic can control the volume transmitted to the Rx, the Samsung TVs don’t; therefore, I wouldn't get the BT Rx/Tx without volume control or volume at the headset will be loud unless you put a volume control between the Rx and the headset plug.
I liked these so much, I bought another pair of Tx/Rx and Rx. Amazon had a lightning deal on the Tx/Rx for around $25. Great deal.
To get them to initially pair, make sure no other BT devices are on. I couldn't get them to pair initially when my BT Samsung UHDTV was on because the TV seems to automatically pair to devices like this. Once I turned off the TV, I could get the Rx/Tx to pair to the Rx. After that, pairing was quick as long as the two were in near contact with each other though other BT devices were on.
When using these with a sensitive, low impedence in ear monitor -- Shure PTH500/530, there is background noise when played at low levels; the Shure can play really loud at a lower volume setting than >50ohm impedance headphones (i.e. No low level noise using Sennheiser HD280 (64 ohm), HD 555/598 (50 ohm), HD 700 (150 ohm), and HD 650 (300 ohm).
Paired to Samsung Series 6/7 UHDTVs as well has headphone output on a Yamaha RX-3060 receiver running a connected BluRay, I find no lag between audio and visual, even after putting the movie through various digital signal processes on the Yamaha.
See my video above for audio quality samples.
To make your wireless microphone, follow these steps:
1. Connect the TROND receiver to your DSLR though the microphone input jack. It will dangle from the camera, but that's fine. Power on camera.
2. Connect the TROND transmitter to the headphone jack in your audio recorder. Power on audio recorder.
3. Connect a wired lapel lav mic to your audio recorder and attach it to your shirt (optional).
4. FIRST— turn on the TROND transmitter on the audio recorder. The light will blink blue quickly.
5. SECOND—turn on the TROND receiver on the camera. The light will blink blue and red quickly and pair, then turn off, blinking occasionally.
6. LASTLY—press record on the audio recorder. If your camera has an audio level display function, you will see the bars move.