JBL 705P / 708P

[12B4A]

It seems like they didn't go with an all-one-chip for the amplification part. There are 6 chips on the signal side of the board that have heat sinks, 2 are FREDs (FCU20A40) and 4 are switching FETs (IRFR4615).

 

[Blumlein 88]

You fellows keep on with the positive reports and I may end up wanting some of these as they become readily available.

 

[Palladium]

FYI, Dr. Toole was asked about his opinion of JBL 705/708 vs M2 on AVS Forum. Here is what he had to say: http://www.avsforum.com/forum/89-sp...viewed-speakers-ever-made-9.html#post54607258

View attachment 8125

Seems like they may be too good for Thomas and hence the reason JBL UK doesn't want to send him one.

*looks at the LSR305s right in front of me*

What blatant lies. All of us know multibillion audio companies can't design good products especially Harman who sold themselves out to Samsung.

 

[watchnerd]

You fellows keep on with the positive reports and I may end up wanting some of these as they become readily available.

I'm thinking the 708P would pair nicely with the NAD M12.

Choose XLR or AES inputs, or maybe go wireless with Blue OS modules.

If only it had a headphone jack.

 

[12B4A]

Sooo...the Class D amp section consists of an IRS20957S (one for high, one for low) driving the IRFR4615 FETs. The necessary Coil/Cap combos on the outputs are sized uniquely for HF or LF.

 

[watchnerd]

Sooo...the Class D amp section consists of an IRS20957S (one for high, one for low) driving the IRFR4615 FETs. The necessary Coil/Cap combos on the outputs are sized uniquely for HF or LF.

Price: ~$8 in single quantities

LOL at Class A amps.

 

[Palladium]

Price: ~$8 in single quantities

LOL at Class A amps.

But-but-but if we use that taboo Class D garbage how would we be able to stand listening to unmusical amp distortion produced magnitudes well below the transducers own distortion?

 

[Blumlein 88]

I'm thinking the 708P would pair nicely with the NAD M12.

Choose XLR or AES inputs, or maybe go wireless with Blue OS modules.

If only it had a headphone jack.

The NAD M12 would be a good combination. However initially I have an old Tact unit that is a digital pre-amp. And it has AES/EBU outs. So I could feed that right in and have a workable all digital setup with remote and multiple switchable inputs.

 

[Blumlein 88]

But-but-but if we use that taboo Class D garbage how would we be able to stand listening to unmusical amp distortion produced magnitudes well below the transducers own distortion?

Easy you'll need an audiophile modification to add an external LPS to each Class D chip.

 

[watchnerd]

But-but-but if we use that taboo Class D garbage how would we be able to stand listening to unmusical amp distortion produced magnitudes well below the transducers own distortion?

Not to mention the SMPS...

 

[watchnerd]

Easy you'll need an audiophile modification to add an external LPS to each Class D chip.

https://www.sbooster.com/

 

[Thomas savage]

Price: ~$8 in single quantities

LOL at Class A amps.

I'm of the thinking , if you know the load ( speaker) and you are the one pairing the known drivers with the known amp ( your making a active speaker) then there's no need to spend much on the amplification.

If your making a amp to deal with a whole host of unknown loads ( speakers , drivers , xovers ect) this is a different and frankly far more expensive and inefficient thing and more costly. ... and really just wrong nowadays imo.

I'm all for brilliant waveguides and fantastic drivers with perfectly matched amp modules and the digital signal processing to make all work in a optimal way, oh then you can test it as a system so have more control over everything.

No brainer ..

I'm fairly excited to get my hands on the 705p's , knowing they match the quality of the big M2 if not the horsepower obviously.

It means I can set them up and directly compare the music to what I expirence though my current home audio system. It's my hope that over the next few years I will end up with a simplified system based on the logical/scientifically valid engineering of the 7 series.

 

[Palladium]

If the audio solution makes too much sense, it will be derided by the 'phools.

Besides Class D amps + SMPS + DSP is like their unholy trinity of audio blasphemy right there. And those $1000 power cords per speaker ain't cheap you know.

 

[jtwrace]

I'm fairly excited to get my hands on the 705p's , knowing they match the quality of the big M2 if not the horsepower obviously.

As an M2 owner and Harman visiter, I can say they will blow you away. Being able to go through the LSR, 705p, 708p and M2's blind was a scary experience. The 705p and 708p are no joke!

http://www.audiocircle.com/index.php?topic=149780.0

 

[watchnerd]

The NAD M12 would be a good combination. However initially I have an old Tact unit that is a digital pre-amp. And it has AES/EBU outs. So I could feed that right in and have a workable all digital setup with remote and multiple switchable inputs.

I was wrong. The M12 doesn't offer variable volume control on the digital out, only on the analog side.

So I'm still in search of an ADC with variable volume and a remote (if I want to go the digital input route).

 

[Thomas savage]

I was wrong. The M12 doesn't offer variable volume control on the digital out, only on the analog side.

So I'm still in search of an ADC with variable volume and a remote (if I want to go the digital input route).

It does do volume attenuation in the digital domain ( 35 bit ) though, it's a shame if that's not offered though the digital out, reading about it seem a really great implementation.

 

[12B4A]

After rooting through the guts, I'm now thoroughly convinced that given the level of processing sophistication, build quality, parts costs, and drivers used, the powered 7 series line is a really high value return on the dollar. When you start to guesstimate labor (even when the amp/dsp is a made in Vietnam amp-in-a-hotel-pan design and the speaker is assembled in mexico), packaging, marketing, shipping, and engineering costs, it makes one wonder how thin the margins are. It seems like these are aggressively priced to push out Genelecs, Focals, Neumanns, Dynaudios, etc. from pro studios.

It also seems like a no-brainer for JBL to just drop this same amp/dsp module in to the M2 cabinet with no real drawback in performance besides 6-7dB less output.

 

[dallasjustice]

If Dirac ever releases Unison, these JBL speakers would be the ideal match for ideal bass management since they are full range and relatively small. I bet it would only take 4-6 of these to fully implement Unison with minimal accompanying hardware.

 

[12B4A]

If Dirac ever releases Unison, these JBL speakers would be the ideal match for ideal bass management since they are full range and relatively small. I bet it would only take 4-6 of these to fully implement Unison with minimal accompanying hardware.

That's exactly why I've been holding off on doing any upgrading to any kind of pre/pro. I want to see which products end up with a Unison implementation.

 

[dallasjustice]

Whenever Dirac releases Unison, I think it will change a lot of things. I use a similar approach with opposing out of phase subs to control length modes. There is no comparable other bass management technique or room treatment. If it's implemented, it will be a fundamental shift in home audio, IMO.

That's exactly why I've been holding off on doing any upgrading to any kind of pre/pro. I want to see which products end up with a Unison implementation.