PK2 earphones are the low impedance version of PK1. Although not as good as PK1, PK2's sound signature is similar to PK1. You don't have to drive PK2 with an expensive head-amp. If you are looking for something with high performance/price ratio, PK2 might be the best choice.
“ ****The following is riddled with hyperbole and flowery, long-winded writing; if you’re not interested in any of these things, please skip to the SUMMARY section, or close down your internet browser, slam your mouse down in disgust, and curse me. Also, the pictures are again taken with a sub-par camera, as my camera has been undergoing numerous maintenance changes. What is...” --tomscy2000
“ At around $65 USD (but also priced just over $40 USD in Taiwan), the entry-level Malleus is an economic tour-de-force. It does come with a much sparser set of accessories than the A03, with no felt carry case, no extreme bass-sealing tips or silicone elastomer rings (according to RedGiant, both may be included in future revisions), but it doesn’t mean RedGiant skimped on the Malleus. ...” --tomscy2000
Durable construction and a powerful sound signature make the Incus a perfect choice for your daily use in-ear headphone. A solid cast zinc-alloy shell directs the energy from the tuned 12mm drivers into producing thick, rich bass instead of flexing or vibrating the housing. The solid build and sound quality offered by the Incus make it a go-to tool worthy of even the most discerning audio...
“ These were my sweetest sounding head-gear yet. It would be brilliant all-rounder if it would not require a portable amp for portable use. This is the first reason i left it, otherwise i almost got an ear infection from those foams.., they get dirty in a few weeks of massive use. I recommend them to clean, i boiled them in water. ” --angevoi
“ Well firstly this is not a true iem. The sound is about as great as one could get from an earbud. In my limited experience and without trying the pk1, I would say these are the finest buds you can buy. With that said, these are not for everyone, this is a niche product within an already niche market. I find driving it with my D12 anaconda makes for a pleasurable sound,...” --Jamesdeandoa
Technical Details * Impedance:32 ohm(at 1KHz) * Frequency response: 20-20,000Hz * Sensitivity:120 dB (at 1KHz) * Max Input Power: 400 mv
“ The PK3 is a great, warm earbud. It does vocals especially well because it is very mid-focused. It has impressive bass extension, not especially strong impact; the trebles are smooth and may roll off too soon for clarity and detail nuts. But the mids are what the PK3 are all about. ” --kmhaynes