qusp
Member of the Trade: Twisted Cables
- Joined
- Jun 18, 2008
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yeah the DSP and included XO must be the most effective weapon here, along with the amp section, because the low power CS chip they are using (I think its the one, capabilities seem to match well) only has 110db from its line outs and less from ADC input, this is OK but compared to the dacs this thing supposedly gives the smackdown to (up to 140db), its actually just OK..... The chip has integrated 4 in and 6 out, integrated 2 channel HP amp, 6 channel line-out (voltage mode) (capable of balanced for 6 channels; just capable of mind you and not in use here) integrated spdif receiver, pass-through and digital volume control. thats some pretty serious tricks from a single (not overly expensive) chip. i'm guessing the balanced outs are being used, but summed down to SE out gaining the extra little bit of DNR and CMMR. although the single ended line outs are pseudo differential as well
pretty cool tech I must say, wonder when/if there will be a more developed device in the same family soon (this chip is quite new). so theoretically, with a supporting power supply, 3 x OPA1632 and regulators (all inputs between 3v3 and 5v for the chip and +/-9vdc should do for the opamps, though this ^^ particular one performs better with +/-15 as in the buffalo) this chip could do the lot pretty much all by itself, can take coaxial spdif (add optical receiver needed for toslink) or analogue signal directly (ADC), convert to audio with internal dacs, control the volume and crossover processing with onboard DSP and perform IV conversion internally, then output from its headamp (no balanced outs on headamp output unfortunately) or multiple line outs
the tricky bit (and where the JME comes in = Jerry/Matt/Entity) is the MCU and filter coefficients for tuning the XO and how they relate to the individual ear canal (whats left of it after the monitor is inserted and the air cavity in the monitor plus bone conduction) plus JH16 and its drivers own FR characteristics. the eval board is available with all of this set up and ready for tweaking using a HDA connection to the computer, when/if I go for this thing, it would be very tempting to get the eval board and construct a fully blown 6 channel home amp, perhaps with some of the fine kits from erno borbely (would take these in preference to the b22 personally, but B22 would work a treat also)
definitely waiting in the wings for a bit after initial release, though if there are any facebook specials I might be convinced to pull out the already tortured, resentful and tattered wallet
pretty cool tech I must say, wonder when/if there will be a more developed device in the same family soon (this chip is quite new). so theoretically, with a supporting power supply, 3 x OPA1632 and regulators (all inputs between 3v3 and 5v for the chip and +/-9vdc should do for the opamps, though this ^^ particular one performs better with +/-15 as in the buffalo) this chip could do the lot pretty much all by itself, can take coaxial spdif (add optical receiver needed for toslink) or analogue signal directly (ADC), convert to audio with internal dacs, control the volume and crossover processing with onboard DSP and perform IV conversion internally, then output from its headamp (no balanced outs on headamp output unfortunately) or multiple line outs
the tricky bit (and where the JME comes in = Jerry/Matt/Entity) is the MCU and filter coefficients for tuning the XO and how they relate to the individual ear canal (whats left of it after the monitor is inserted and the air cavity in the monitor plus bone conduction) plus JH16 and its drivers own FR characteristics. the eval board is available with all of this set up and ready for tweaking using a HDA connection to the computer, when/if I go for this thing, it would be very tempting to get the eval board and construct a fully blown 6 channel home amp, perhaps with some of the fine kits from erno borbely (would take these in preference to the b22 personally, but B22 would work a treat also)
definitely waiting in the wings for a bit after initial release, though if there are any facebook specials I might be convinced to pull out the already tortured, resentful and tattered wallet