Official OPPO BDP-95 Owner's Thread - Page 205

Originally Posted by USAFChief

I've got the ER-4s and love them...you just have to wear them properly (fully inserted into the ear canal) to get the full bass. I had to purchase the small bud tips to wear them comfortably and to get them all the way in, but once you find the sweet spot, they're terrific. I usually use some Dennon D-2000 at home and ER-4s for the I-Pod, but they sound great hooked up to the 95/HP amp.

Originally Posted by neutron77

I think that's 105 dB/mW which translates into 123 dB (1Vrms) for 16 ohms which as with most compact earbuds these days is really high. If you used the 1kohm voltage divider as in the diagram, you are getting about 92 dB SPL volume (for full volume content from the OPPO). You can up the listening level to 98 dB SPL by replacing the 1kohm resistor with 500 ohms (useful for material recorded at lower levels). If you audition really great headphones (you will be amazed at the difference), bring your box and OPPO along with your favorite CD/SACD/DVD-A and see how great the OPPO sounds directly into phones (with adapter circut).
I will be adding a simple conversion script (sensitivity to efficiency etc.) in that web page shortly.
Here's another adapter box, this one with 1/4 stereo jack for the phones:

anyone here made their player region free yet.

Originally Posted by mm120525

Here is my box :http://dl.dropbox.com/u/29999148/headphone-box.JPG, I do have a great HP system - Stax SRX-III + SRA-12s, but it needs a tune up, as I did not use it much lately, so the contact needs to be clean. I also want to try some top quality earbuds such as ER4S, 106 dB @ 1mW - 100 Ohm, what SPL can I get with your HP box ?

Originally Posted by Bob Pariseau

You might try setting the player to output RGB Video Level instead of YCbCr 4:4:4. If you see no quality difference then that's a simple workaround which may keep your display happier as regards the HDMI handshake.

Also, if the problem goes away when you set the player to 1080i (not 1080p) with Deep Color OFF, then that suggests a bandwidth problem which can often be fixed by upgrading your HDMI cables. If you have an AVR in the middle, then the HDMI cables on either side if it could be the culprit.
--Bob

Originally Posted by ManWithAPlan


Bob, this begs a further question - do you recommend leaving Deep Color On in most cases? I have the Oppo95 connected to the D2V and then to the new Elite TV from Sharp (with Pioneer technology in it). I have the requisite 1.4A high speed cables as well. Always wondered how to tell the right Color Space settings as well. I leave the D2 on Auto now, and it seems to look great, but not sure what it is "negotiating" by being on Auto for most things.

Thanks,
Brian

Originally Posted by neutron77

hmm, the specs I see for the ER4s shows 100 dB/mW (the ER4p are 106 dB/mw). With the circuit components, you would get ~ 91 dB SPL for max. volume from the OPPO players. With R1 = 500 ohm (instead of 1 kohm), which is about the minimum value of R1 you should use, you would get 96 dB SPL listening level. (The efficiency/sensitivity conversion script is now added at the bottom of the web page.

The calculator also allows you to change the R1/R2 resistor divider values and displays the voltage and power dissipated at the headphones.

Originally Posted by mm120525

Thanks again for your expert advice, you are also correct on 100db/mW for ER4s, wondering if we can take advantage of the higher XLR output (4.2Vrms vs 2.1) to get more volume for the less efficient HP - for those people who uses RCA to connect 95 to their pre-amp for various reasons, currently, I am using XLR to RCA adaptors for your HP box (XLR 1 & 3 to ground, XLR 2 to hot).

Originally Posted by Kraton

Yes, and it works fine.

============================================================ =====

Bazinga!
http://www.sa-cd.net/library/7548

Originally Posted by neutron77

To take advangate of the 4.2V differential swing for headphone usage, you'd probably need to add a differential input opamp box, with one amp for each of the 2 XLR outputs (what active headphone amps with XLR inputs do). Apart from using small transformers (deteriorates audio characteristics), I don't think you can do this with a passive network with typical headphone wiring. The 95 LME49724 opamp driver for the XLR outputs is a very impressive chip(can source up to 80 mA and has a very low thermal resistance) but I haven't done any measurements or tests on the XLR outputs.

Originally Posted by mm120525

Please do not waste your time to test XLR output, I think I will go with ER4s with R1=500 Ohm, to get up to 96db SPL, which is loud enough for me, assuming R1/500 Ohm will not degrade the sound, which otherwise defect the purpose.
BTW, My wish list for the next 95 firmware upgrade is to have finer volume increments on the remote, as well as a bigger "Home" button - next to the power button would be nice.

Originally Posted by Bob Pariseau

You have to check to see what looks best with your combo (the display also matters). I recommend picking an explicit choice for Color Space. The OUTPUT settings of the D2v should also be set explicitly. Note that it's OK for the input and output of the D2v to be different if that looks better.

If you search the 93 thread for a post by me citing "Ratatouille", you'll find one possible way to check for the best fit of Deep Color and Color Space combos.

All the basic video levels have to be adjusted properly first (usually done using ONLY the controls in your TV). Recheck that those settings still hold if you change Deep Color or Color Space (they should, but check). Use a calibration disc like Spears & Munsil for this.

ETA: Avoid using RGB PC Level output unless that's the only thing that works. That's for displays intended for use as computer monitors instead of home theater devices. So you've got 3 Color Space choices and the set of Deep Color Choices for each.

Just to give you an idea how much fun this can be, in MY setup, YCbCr 4:4:4 works best for HDMI 1 video, and RGB Video Level works best for HDMI 2 video. Go figur....

With my Display, Deep Color OFF (Dithered) works best on HDMI 1, and Deep Color OFF on HDMI 2.

For most people with newer displays, I'd expect Deep Color 36 Bit to be the more likely choice, at least on HDMI 1 when not using Source Direct.
--Bob

Originally Posted by m4bama

OK would let me where you got the mod at or pm me.

Originally Posted by neutron77

The XLR outputs, terminated single-sided as you have them, should be at least as good as the RCA outs. In fact, you could use BOTH the + and - sides of the XLR pins to single-sided outputs to drive two identical headsets simultaneously (they would be phase-reversed of course) .. with outstanding performance. 500 ohm (with 150 ohm for R2) should be fine with your ER4s. It is amazing that the phones dissipat. only 0.40 mW to get 96 dBSPL!

The 95 attenuator steps are exact 2 dB increments:
10 0dB
9.5 -2dB
9.0 -4 dB
....

Originally Posted by Robert Simandl

Hey all, just ordered one of these from Audio Advisor. My receiver doesn't do HDMI, so I'll be using the multi-channel analog outputs.

Any suggestions on good interconnect cables to use that don't cost another arm and leg (since I already paid an arm and a leg for this player)? Obviously I'll need to buy three pairs of 'em.

Thanks!

Originally Posted by Robert Simandl

Hey all, just ordered one of these from Audio Advisor. My receiver doesn't do HDMI, so I'll be using the multi-channel analog outputs.

Any suggestions on good interconnect cables to use that don't cost another arm and leg (since I already paid an arm and a leg for this player)? Obviously I'll need to buy three pairs of 'em.

Thanks!

Originally Posted by neutron77

hmm, the specs I see for the ER4s shows 100 dB/mW (the ER4p are 106 dB/mw). With the circuit components, you would get ~ 91 dB SPL for max. volume from the OPPO players. With R1 = 500 ohm (instead of 1 kohm), which is about the minimum value of R1 you should use, you would get 96 dB SPL listening level. (The efficiency/sensitivity conversion script is now added at the bottom of the web page.

The calculator also allows you to change the R1/R2 resistor divider values and displays the voltage and power dissipated at the headphones.

Originally Posted by mm120525

ER4s is out of stock, ER4p is easier to get, but it is rated 27 Ohm @1khz, will ER4p truly becomes an ER4s with a 75 Ohm adapter ?
ER4p is more efficient when connects to an iPod, but would it have even lower SPL output than ER4s with your HP box/Oppo 95 combo, as the resistance is different.

Originally Posted by neutron77

The calculator on the web page allows you to change ALL the parameters (all resistors in the divider, headphone impedance, sensitivity and player internal resistance and drive voltage). Give it a try ... however, even though the ER4p has lower impedance, the higher sensitivity more than compensates for that (in the circuit). So with R1=500ohm, R2=150 ohm, you will get nearly 100 dBSPL listening level (as you will verify).
There might be a bug or 2 lurking so if you see something untoward, let me know.

Originally Posted by mm120525

Thanks again, was a bit confused as to which #s I need to use for your table - from ER4p's specs : "1 kHz sensitivity (ER-4P): 108 dB SPL for a 0.2 V input(102 dB @ 0.1 V; 106 dB @ 1mW) @ 27 Ohms" It is now clear to me that I only need to enter "106dB" & "27 Ohms" with R1=500 to get the 99.8 dBSPL output - with your HP box/95 combo, but your sensitivity figure seems to be different than those from ER4p's manual.

Originally Posted by neutron77

The input for that table must be EITHER the efficiency in dBSPL /(1 mW) OR the sensitivity dBSPL (1Vrms). In their case use the efficiency since they give you that figure in the correct units, and convert to sensitivity:

The figures for the 4s agree exactly with their published figures:
ER-4s specifying 100 ohm and efficiency 100 dB/(1 mW) converts to 110 dBSPL (1 V). This is identical to 90 dBSPL(0.1V) in their table since 0.1V is 20dB less than 1V, and also with 108dBSPL (for 0.79Vrms) in their table. Perfect agreement.

The actual dbSPL (circuit), 99.8 dBSPL in your case, will of course depend on the circuit components R1 and R2 and Rphones etc...

For the ER-4p with 27 ohm and efficiency of 106 dB/1mW, my calculator predicts a sensitivity of 121.7 dBSPL/1V. Their spec for 0.1V should be exactly 20 dB lower or 101.7 dBSPL/(0.1V) which agrees with their spec of 102 dB/(0.1V). In addition, their spec for 0.2V should be exactly 6dB higher than the 0.1V spec which it is at 108 dB/0.2V. Perfect agreement.

Originally Posted by neutron77

To take advangate of the 4.2V differential swing for headphone usage, you'd probably need to add a differential input opamp box, with one amp for each of the 2 XLR outputs (what active headphone amps with XLR inputs do). ....

Originally Posted by Bachelor

I've had some B&K issues and hooked the Oppo directly to my 2 channel and 5 channel amps using the volume control on the Oppo with pretty good results. I'll do this until I can decide what to do for a different HT preamp.

Originally Posted by chrapladm

Just wondering also what is the lowest frequency the Oppo send signal wise?

I have always been in a search for the 3-120hz for bass so I just wanted to make sure I could do this with this as a preamp.