Making further progress, TOPPING’s new flagship amplifier will be launched in late May!

[dsnyder0cnn]

What do you expect to achieve by bi-amping? If your speakers still have a passive crossover there is really no benefit (plenty of posts to read to understand this)

A miniDSP Flex will do exactly what you want. It is also a crossover if you are properly bi-amping.

Yup. That's basically what I said.

 

[dsnyder0cnn]

Please don't forget about the dynamics...

I don't recall seeing a metric on the standard amplifier dashboards that captures dynamics. Especially absent the load from a specific loudspeaker.

I already have a pair of B200's. If I can think of a use for a third one, I may drop-ship it to Amir, unless someone else beats me to it.

 

[Burns]

Is that what you're talking about? https://www.audiosciencereview.com/...urements-and-minidsp-2x4-hd-dsp-and-dac.2674/ I guess I don't understand our message. Why do I spend money on monoblocks with phenomenal signal-to-noise ratio to plug in a DSP processor? Do I need 4xB200? I don't know, probably not, but I see a lot of people trying to control bass with separate amplifiers

 

[JeremyFife]

Is that what you're talking about? https://www.audiosciencereview.com/...urements-and-minidsp-2x4-hd-dsp-and-dac.2674/ I guess I don't understand our message. Why do I spend money on monoblocks with phenomenal signal-to-noise ratio to plug in a DSP processor? Do I need 4xB200? I don't know, probably not, but I see a lot of people trying to control bass with separate amplifiers

Hi,
Here's a thread on bi-amping that might be a good place to start
Thread 'Passive Bi-Amping (Bi-Wiring) vs Single wiring' https://audiosciencereview.com/foru...e-bi-amping-bi-wiring-vs-single-wiring.59450/

As @dsnyder0cnn also said, you can't control bass separately if your speakers still have a passive crossover in them.

The reason for wanting DSP is not to manage the electronics but to compensate for interactions between speakers and room. 'Perfect' amplification doesn't make any difference here.

The other reason for suggesting miniDSP is to have a crossover *before* the amplifiers - only sending bass frequencies to the bass drivers. Again, that only works if your speakers do not have crossovers.

Simply put, you only need one pair of mono amps.

 

[Burns]

@JeremyFife - Thank you very much.
Hi,
I thought about changing the Topping L70 to Pre90. Probably won't do that because they are quite similar device. I like the L70.
I read about Topping lowering impedance https://www.audiosciencereview.com/...reamplifier-extender.17635/page-5#post-573822 I started to wonder now if L70/Pre90 are properly matched with B200 (40:10000)?

 

[misterdog]

started to wonder now if L70/Pre90 are properly matched with B200

Working mighty fine in my house.

E70 > Pre90 > B200 > Quad 989 ESL.

 

[Burns]

What are those coils of twisted wire without a core before the speaker outputs? Is this an implementation of that reverse coupling that Topping boasts about in the B200 model?

 

[Burns]

My silver:

 

[misterdog]

What are those coils of twisted wire without a core before the speaker outputs? Is this an implementation of that reverse coupling that Topping boasts about in the B200 model?

It's a copper coil inductor probably forming part of a Zobel network.

 

[WeekendWarrior]

I already have a pair of B200's. If I can think of a use for a third one, I may drop-ship it to Amir, unless someone else beats me to it.

If you mean for testing, he posted recently that he already has the B200 but hasn't got round to testing yet.

B200 for testing

 

[Burns]

What power supplies do you have in your Topping B200 models?
I had the test equipment (black B200) with a 64V, 4A power supply (model JLY64004001)
The one I bought, a fresh delivery (silver B200), had a 12V Y-type trigger cable added to the box with the power supply. However, the power supply is different, 60V, 4A, i.e. lower voltage(model JLY60004001).
Did they make a mistake when packing at the factory, or did they change something on purpose?
I guess I'll have to send them an email with a question.

They must have changed something because I got 2x 60V power supplies to 2x B200. Both pieces are the same, which excludes a mistake.

 

[Burns]

Topping:
"
Thank you for contacting TOPPING support. We are happy to assist.
The two power adapters are identical; they are just labeled differently and will not cause any difference in volume. In future production, we will continue to use the 60V label.
So you can use it with confidence."

 

[BeeKay]

Thanks for clarifying. That saves me from crawling under the HiFi rack.

 

[restorer-john]

Topping:
"
Thank you for contacting TOPPING support. We are happy to assist.
The two power adapters are identical; they are just labeled differently and will not cause any difference in volume. In future production, we will continue to use the 60V label.
So you can use it with confidence."

The two power adapters are not identical. One is marked 64V the other 60V.

A 4V difference on a BTL amplifier will make a large difference in power output. Get someone to measure with a DMM the 64V unit unloaded and the new 60V unloaded and report the difference.

 

[Zek]

The two power adapters are not identical. One is marked 64V the other 60V.

Assuming that what it says is exactly so...

 

[Burns]

My power supply 60V, 4A, (lower voltage, model JLY60004001):

 

[BeeKay]

60V PS

 

[Burns]

Now someone has to measure what is on the label 64V

maybe it's a change to some green EU standards hidden only in the label and the equipment is actually identical

 

[babadono]

I just tripped back onto this thread...I can measure my 64V P.S. that came with LA90s and B200s but not until the weekend. At least I think they all are 64V. We'll see...

 

[charlielaub]

60V PS

There is this spec called "regulation" that you might want to consider. When the output voltage is not strictly regulated it (the voltage) will rise under no- or low-load conditions and as current it drawn will fall. The 60V spec, when not listed "at XXX Amps of current draw, should probably be considered more like a "nominal value"...

I assume that you are simply measuring the "no load" voltage with your multimeter, with no other load connected in parallel with the PS, right?

When drawing 100 or 200 W the voltage might fall enough to be less than 60V.