Alpha & Delta is a Singapore brand that features a lineup consisting of AD01, D2 and JAAP that targets different users. The D6 is a newly released iem that utilises their own technology, HDSS high definition. I would like to thank Lend Me Ur Ears for this opportunity to review their latest iem, Alpha & Delta D6. At the moment, you can purchase the D6 from .



  • Driver unit: 10mm dynamic driver
  • Impedance: 16 ohm
  • Rated power: 1mW
  • Frequency Response: 10 Hz – 40 Khz
  • Speaker Sensitivity: 1055 +/- db/ mW
  • Cord Length: 1.2m silver plated copper cable (each core contains 22X 0.05 silver plated copper wires)

Unboxing & Accessories

The D6 comes in a black package with a transparent cover. At the front of the cover, it shows the description, brand name and model name. After removing the cover, there is a leather case which contains 1 pair of ear guides, 1 shirt clip, 3 packs of tips and 1 leather cable wrap. There is an instruction manual too. The overall packaging is nice.



IEM Build & Design

The D6 has a glossy gunmetal faceplate with the Alpha and Delta initials printed on it, “AD”. Below the initials, there is the HDSS technology name printed. It is in a different shade so it will contrast with the gunmetal colour. There is a vent at the top of the iem and near the nozzle. The iem has a circular shell with circular indents. It has a straight nozzle with a soft mesh for earwax prevention. The material used to make the D6 is aluminium. The iem has no detachable cable. The D6 is rather light weight and its design is quite simple. Overall, it is constructed well and fits in my ear comfortably.





Cable Build & Design

The cable is 8 core braided and there is strain relief on each side. On the strain relief, there is a L & R marking on the inside of the strain relief to differentiate between left and right. There is no memory wire area. Moving on to the y-splitter, it is circular and the housing is gunmetal in colour. There is strain relief at both ends. Lastly, the jack is 3.5mm right angled gold plated. The housing that extends from spring loaded strain relief is gun metal in colour while the housing that extends to the gold plated jack is matte black in colour. It is a good cable with a robust build and visual appeal.


Sound Analysis


The D6 has an excellent sub-bass extension with a great punch to it. The sub-bass extends itself well and I am able to feel the depth. Rumble is speedy and it is presented in the most engaging way. The bass decay is agile and each bass note keeps coming which helps to improve the overall dynamics. There is no lacking in body too and this does not compromise on the nature of it. Presentation is rather clean. There is a good mid-bass slam which helps to give the sound an extra punch. Bass is generally impactful and there is a smooth transition from the lows to the lower midrange.


The midrange on the D6 is fun sounding. I feel there is a good quantity in the midrange. For the lower mids, it is slightly boosted by the lows. It is not hollow and male vocals are presented in a natural way. The upper mids is quite forward and female vocals shine with definition. There is crisp and I feel the quantity is sufficient for vocals to have a bite. Resolution on the D6 is good and the midrange operates in a clean and lively manner.


The treble is extended well with a good mastery. It is tight and the finesse is there. There is good quantity to it with a slight sparkle for a punch. There is no sibilance and harshness. Although it is not the smooth kind of treble, it retains the liveliness with a very tight control so it will not be expressed as shouty. There is a good level of details retrieval and the amount of air rendered gives a lot of space so it does not sound congested.


The D6 has a good width in its stage so you will get an open feeling. The width aids in the positioning of instruments and vocals. The depth is not close in and there is a good 3D feel with vocals intimacy being retained. There is a good natural expansion.



Alpha & Delta D6 vs TFZ Exclusive King

The D6 has less sub-bass quantity but its extension is greater than the King. It stretches deeper and the sub-bass reproduction is clean. Bass articulation is very similar. The D6 has more speed than the King and there is a better expression in the rumble. Rumble is pacey and the overall sound is more exciting. The mid-bass quantity on the King is more and there is more slam. In terms of the overall bass, the D6 is more exciting due to its quick decay. The lower mids on the King has more quantity than the D6. In terms of upper mids, I find the D6 to be more forward and there is extra definition and crisp. There is a good bite coupled with intimacy of female vocals. Next, the treble on both has similar air and D6 being the more energetic one, has a good sparkle. Treble articulation on the D6 is more precise. Details retrieval on both is very similar. In terms of soundstage, I find both of them to have an equal width and the D6 has an added depth for a more open feel. Positioning of instruments and vocals are better on the D6. Resolution of both is very similar but D6 has the edge due to its speedy decay.

Alpha & Delta D6 vs Mee Audio Pinnacle P2

The P2 has more sub-bass quantity than the D6 and extension on both is very similar. The P2 has a rumble that is as quick as the D6. Bass decay on both is similar. I find the bass articulation on the D6 to be more precise. The mid-bass quantity on the D6 is slightly more with more slam. Overall dynamics increase for a more engaging listen. Transition from the lows to the lower mids are quite smooth on both. Lower mids on the D6 has similar body as the Pinnacle P2. Male vocals are being expressed without sounding hollow. The upper mids on the P2 is more forward and there is a slight crisp to it. In the treble department, D6 has more air rendered with sparkle. There is more bite on the D6. Presentation on both is clean with a good level of details retrieval. The D6 has more stage width and depth. The positioning of instruments and vocals is more accurate on the D6. Resolution on the D6 is more refined.

Alpha & Delta D6 vs Kinera H3

The H3 has more sub-bass quantity but it lacks the extension D6 has. The bass impact on both is present with the D6 stretching more deeply. Bass decay of H3 is slightly faster with a quick rumble. The bass note on the D6 does not hit very hard but it is being articulated with authority and control. The bass texture on the D6 is slightly smoother. For mid-bass, the D6 has more slam for increased dynamics. The lower mids on the D6 has more quantity than the H3 while the H3 upper mids is more forward. Male vocals is definitely better expressed on the D6. For female vocals, I feel the D6 has a good mastery in it while the H3 does not control it as well. In terms of treble, the D6 has a good treble body and extension. It has similar amount of air as the H3. Moving on to the soundstage, D6 has the better width while H3 has the better depth. Resolution level is very close.


The D6 is a detailed bright sounding iem that has a good mastery at the top end. Not only does it has finesse in its treble presentation, its bass note has a very good impact which helps to raise the overall dynamics. Coupled with a 8 core cable and a spring loaded design for the jack’s strain relief, the D6 has a combination of excellent build design and engaging sound signature.