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Old 11th December 2006, 12:50 PM   #11
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Quote:
Originally posted by Klimon


Not really, many seem to prefer D-class over high-end mosfet amps and some over tube-amps.
Including me !

Days of these good old early days digital-amps myths are over. Give'em good, clean, pure power and they outperform anything.

Look at commercial products. Such as Jeff Rowland etc.. They just can't ignore that fact . They do have digital-amps as a base for their products! It's not only the DIY crowd relying on digital-amps.

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Old 11th December 2006, 03:25 PM   #12
felixx is offline felixx  Romania
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@soundcheck
The Behringer DCX2496 is not a good option ...in my opinion.The noise is too much present...and is NOT from analog stages.I tryed to replace that analog op's with AD 829 and LT 1226.All that procesing and converters is too noises....at least for my ears.
If you want a better solution in loudspeaker management I think
the BSS Omnidrive is a better solution.
Maybe for your spl is not an issue.

The spl on my speakers is 98db and that will be a problem for amplifiers.

This is my tube amp and the sound is not with that caracteristical tube amplifiers sonic....less colorations in the sound,a better responce in frecv. and a overall good sound...almost neutral sound.

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I have no doubt about the quality of Ice ....and other few firms who have implement this options on quality products.
Many of class D have parameters similar with 90's - hi-fi amps but on small "footprint".

I read some reviews about T amps but ....my concern is the level of noise on 98-100db spl speakers.

Anyone tryed class D on that spl?
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Old 11th December 2006, 03:57 PM   #13
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I am using the Behringer for the subs only.
The noise is not a big issue for the subs.
BSS omnidrive is a different league -pricewise nothing.
I'd rather look up a pure DSP solution.

There are several threads here refering to Behringer mods.
I just changed out some caps in the input and output stages for now.

I am running Bastanis fullrange speakers at 98dB SPL.
No issues with noise! I filterd the T-AMp against RF/EMI quite well.
That makes a difference. The output coils need also some shielding.
But, since you run the amps ( for the fullrange) at very low output current and voltage, the radiation will be very low and therefore not an issue.
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Old 11th December 2006, 04:01 PM   #14
felixx is offline felixx  Romania
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I talk to Robert about some issues,very nice person,and I know what drivers he used.
O.K....so...your first recomandation for me....because also I need only for bass drivers what D class will be?
-Ice
-UCD
....etc?
Maybe a small clasification....
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Old 11th December 2006, 04:08 PM   #15
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My choice:
I'd say the 4 chanel T-AMP (by paralleling 2 chanels)
and a nice SMPS will give you more than a decent punch for your subs.

You can even play with your fullrange if you not use the chanels in parallel!

I don't think that Ice or Hypex will perform very different.
I can't help here , i havn't really compared them.

You might find some threads around here comparing them.
AFAIK the Ices are not sold als DIY modules.
So Hypex would be the way to go.


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Old 12th December 2006, 07:00 AM   #16
Pano is offline Pano  United States
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Quote:
Originally posted by felixx
I read some reviews about T amps but ....my concern is the level of noise on 98-100db spl speakers.
The small T-Amps are dead quiet. I test them on rigs up to 106dB/W No noise, unless you stick your ear in the horn.

But of course you need higher power, higher gain amps. So noise may become a problem - but that would be true of any amp. Most users are very happy with the low noise foor of Class-D amps, tho. Even the high power models.

With a good, strong power supply a Class-D amp can really grab your woofers with a firm hand and give them a good shake.
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Old 12th December 2006, 02:48 PM   #17
felixx is offline felixx  Romania
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What do you think about UCD kits?
Some people said the UCD and Ice power should be the best option.....
...more quiet and more dinamics than Tripath chips.
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Old 12th December 2006, 03:23 PM   #18
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As I said earlier. I am running my subs with Ices, because I had them around. They're doing a great job. I don't miss anything. My T-AMP runs also very dynamic.
I had the Ices running my fullrange and tweeter before.
I prefer my battery powered T-Amp running my fullrangers instead of IcePower. That might be a different story if you have low efficiency speakers.

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Old 12th December 2006, 03:26 PM   #19
giulio is offline giulio  United Kingdom
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Quote:
Hmmmm....The main driver is 8" Supravox full range and I will go for them with tube amps.
But for the bass drivers it seems a little bit extra power...considering eq.
Still ....I'm looking for the best suitable amp for that...high dumping factor,fast slew/rate responce,wide band freqv....etc.

Hi Felix,

similar set up here. Lamdba td15S + Supravox 215 rtf64 + ESG1 ribbons.

I equalize the bass some 20db between 200 and 20hz. I have just bought a second hand yamaha p4500 for 200 pounds. I am using a Charlize (TA2020) on the supravox. Dcx2496 for xover. I still need to buy a tweeter amp.

I have set them up last weekend. Very nice...
best
Giulio
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Old 13th December 2006, 01:12 AM   #20
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Bass amps are less important - I am not sure.

I had a pair of dual monoblocks driving a pair of Peerless XLS 12" in U-frames. They are rated 135W into 8R and about 200+W into 4R, capable of 2.5R load with 120,000uF capacitor bank and twin 625VA toroidal transformers.

I also had the same monoblocks with high power MOSFETs and higher rails so the amplifiers are rated at 400W into 8R per channel.

Which one sound better? the 400W monoblocks for sure. Actually much better.

The XO is at 100Hz but good bass still needs good amplification.

Of course, it depends on the rest of the system as well.

Regards,
Bill
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