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Old 8th May 2014, 01:46 PM   #921
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Join Date: May 2014
Greetings from Canada. I'm a new member here and have some questions about the Acoustat Spectra 1100 speakers. I know literally nothing about them and cannot find the specs for them. I am looking for a pair of speakers that would mate well with an old vintage Epicure M1 power amplifier that I recently purchased and entirely restored to almost "as new" condition. The owners manual of the amplifier says that it is rated for 125w/ch - though typically over 150w/ch@8ohm. Mine however was benched at the techs at 186w/ch. The manual says that it is stable to dead. Now there's no information on the pairing into the various impedance. My old Denon POA 2800 was 200w into 8ohm and 350w into 4ohm however I have no idea what, or if, the Epicure M1 does the same.
Wondering if the Acoustat 1100 Spectra would be a good option for this particular amplifier due to - after reading some of your posts on dyaudio - the Acoustat calls for 4ohm-2ohm capability....no?
Lastly, the fellow is asking $275.00 for them. Says they are in very good condition, has all the parts though replaced the 8" drivers with Dayton Audio RSS210HF-4 which specs are:

Product Specifications
  • Nominal Diameter 8"
  • Power Handling (RMS) 280 Watts
  • Power Handling (max) 560 Watts
  • Impedance 4 ohms
  • Frequency Response 27 to 1,000 Hz
  • Sensitivity 83.5 dB 1W/1m
  • Voice Coil Diameter 2"
  • Magnet Weight 50 oz.
Would these be either a proper match for these Acoustats? Improvement over the original drivers? Or something that would hinder/negate their performance/mismatch?



Would this be worth the investment? I know absolutely nothing about the Acoustat line only a bit from reading on the web. Never saw or listened to a pair before. My alternative was/is a pair of ADS910.


Thank you so much in advance and kind regards...
Jer
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Old 8th May 2014, 10:12 PM   #922
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Default AHT Dan Fanny

Hi guys for those of you looking for Dan Fanny, i am good friends with him and have done some work with him. He is still as passionate about his sound as when he was with AHT. With his permission i can let you know how to get a hold of him.
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Old 9th May 2014, 06:46 AM   #923
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Location: Sweden
Quote:
Originally Posted by SirJer View Post
Greetings from Canada. I'm a new member here and have some questions about the Acoustat Spectra 1100 speakers. I know literally nothing about them and cannot find the specs for them.
Here you can find info on them.
Quote:
Originally Posted by SirJer View Post
Wondering if the Acoustat 1100 Spectra would be a good option for this particular amplifier due to - after reading some of your posts on dyaudio - the Acoustat calls for 4ohm-2ohm capability....no?
The panel impedance drop to 1 ohm for some frequencies, see the diagram in the link above. However I've never had a problem driving my Spectra 11 panels even with budget home cinema receivers from Denon and Onkyo.
Quote:
Originally Posted by SirJer View Post
Would this be worth the investment? I know absolutely nothing about the Acoustat line only a bit from reading on the web. Never saw or listened to a pair before.
Seems like a good price considering just the replacement drivers costs $200 new. Of course I would advice you to inspect and listen to them before buying them.

If you have the possibility I would suggest that you bi-amp them and remove the passive XO filter. Buy a miniDSP or similar and use your amplifier to drive the panels and buy a cheap class D amp with lots of power to drive the Dayton 8" drivers. This will give you the cleanest sound and possibility to tune the frequency curves for a perfect match.
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Old 9th May 2014, 12:33 PM   #924
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Quote:
Originally Posted by phazer99 View Post
Here you can find info on them.

The panel impedance drop to 1 ohm for some frequencies, see the diagram in the link above. However I've never had a problem driving my Spectra 11 panels even with budget home cinema receivers from Denon and Onkyo.

Seems like a good price considering just the replacement drivers costs $200 new. Of course I would advice you to inspect and listen to them before buying them.

If you have the possibility I would suggest that you bi-amp them and remove the passive XO filter. Buy a miniDSP or similar and use your amplifier to drive the panels and buy a cheap class D amp with lots of power to drive the Dayton 8" drivers. This will give you the cleanest sound and possibility to tune the frequency curves for a perfect match.
Thanks very much. Very interesting stuff there. Didn't know that these speakers were that mailable, if that's the proper word, to tune them. I'll be posting more on these things should I pop on them. I appreciate the information very much. Greatly appreciated...
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Old 9th May 2014, 09:03 PM   #925
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Location: Chandler Arizona
Quote:
Originally Posted by SirJer View Post
Greetings from Canada. I'm a new member here and have some questions about the Acoustat Spectra 1100 speakers. I know literally nothing about them and cannot find the specs for them. I am looking for a pair of speakers that would mate well with an old vintage Epicure M1 power amplifier that I recently purchased and entirely restored to almost "as new" condition. The owners manual of the amplifier says that it is rated for 125w/ch - though typically over 150w/ch@8ohm. Mine however was benched at the techs at 186w/ch. The manual says that it is stable to dead. Now there's no information on the pairing into the various impedance. My old Denon POA 2800 was 200w into 8ohm and 350w into 4ohm however I have no idea what, or if, the Epicure M1 does the same.
Wondering if the Acoustat 1100 Spectra would be a good option for this particular amplifier due to - after reading some of your posts on dyaudio - the Acoustat calls for 4ohm-2ohm capability....no?
Lastly, the fellow is asking $275.00 for them. Says they are in very good condition, has all the parts though replaced the 8" drivers with Dayton Audio RSS210HF-4 which specs are....

Would these be either a proper match for these Acoustats? Improvement over the original drivers? Or something that would hinder/negate their performance/mismatch?

Would this be worth the investment? I know absolutely nothing about the Acoustat line only a bit from reading on the web. Never saw or listened to a pair before. My alternative was/is a pair of ADS910.


Thank you so much in advance and kind regards...
Jer
I can't comment on the suitability of that particular amplfier to drive the Acoustat Spectra 1100. Although it is a relatively 'difficult' load, many amplifiers don't seem to have any trouble driving them. Most people choose the speaker first, and then find a suitable amplifier, but there's no saying the process can't be done the other way around.

That is a VERY good price for the Spectra 1100, especially if that's the pair price. In fact, it's such a good price that I would suggest proceeding with caution, as I can't help but wonder if something is wrong with them.

The replacement woofer may be a 'better' woofer in the absolute sense, but how well it integrates with the ESL is another question. The original crossover was designed specifically for the original woofer, so unless the crossover was also modified, the new woofer may not be as good as it could be.

My suggestion would be to listen before you buy, preferably using your amplifier. This will answer whether your amplifier is up to the task, and also whether the speaker is operating to your satisfaction.

Good luck and gave fun!
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Old 10th May 2014, 02:02 PM   #926
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Thanks very much. The sad reality is that they are a four hour drive away. The seller says are in superb/excellent condition. Apparently still has all the original driver etc. - perhaps simple foam job? No idea. I was thinking on taking a chance just the same. I know the amplifier is a very sturdy beast from their being used in both home and - pre-digital - cinema systems with excellent reviews by past and present owners.
I do know that the amp is stable under all the various ohm loads and has the ability to connect 3 sets of speakers @ 186w/ch so I thought of the option of bi-wiring these Spectra with an extra channel open for additional set of out door speakers....
This purchase will most likely be a "hail Mary" purchase or let slide.....simply due to the distance of them away....
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Old 14th May 2014, 07:50 AM   #927
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Hi
I am a new member based in South Africa. Before registering I saw a PDF document that had all the available mods to Acoustats. I have had a pair of 44s for about 25 years and I am generally happy with them. I would like to modify the interface if it is a good idea. I am also enquiring as to the viability of getting a model 2 or 3 and lying on it side to use as a centre channel - any thoughts
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Old 14th May 2014, 09:49 PM   #928
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Quote:
Originally Posted by stevetennant View Post
Hi
I am a new member based in South Africa. Before registering I saw a PDF document that had all the available mods to Acoustats. I have had a pair of 44s for about 25 years and I am generally happy with them. I would like to modify the interface if it is a good idea. I am also enquiring as to the viability of getting a model 2 or 3 and lying on it side to use as a centre channel - any thoughts
I am not aware of any published modifications for the 44 or any of the other Spectra models. As the Spectra series represented the pinnacle of Acoustat's achievement, there really isn't much that can be done to them, in my opinion. The documents you refer to above were for the older MK-121 based speakers.

I don't have much experience with center channel speakers (I'm a strict two-channel man myself). But one of the older speakers, like the Model 2 or 3, either in its intended vertical position, or turned on its side, would probably serve well for a center channel. I would be more inclined to try it in its normal vertical position first, to see how well it works.

The Spectra series would probably be less well suited to a center channel speaker, due to their asymmetric dispersion pattern.
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Old 18th May 2014, 01:27 PM   #929
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Hi can anyone help. I am an avid fan of accoustats had Model 2's 3's and now I think 2+2. The power unit behind the speaker is MK 2146. It also has "44" on them. I drive them with Steinhart Bolero 350 watt valve amps. I am using these as the fron speakers in a 7 channel suround sound system - front end by Emotiva UMC 200. Issues: Does the "C" mod work with these or is there a mod that can be done - had these for over 25 years? If I wanted use two amps to drive them what do I need to do? (Below 100Hz handled by subs on all 7 channels.) If I get hold of a model three or a 2+2 can I mount this sideways between the left and right accoustats?
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Old 19th May 2014, 06:37 PM   #930
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Quote:
Originally Posted by stevetennant View Post
Hi can anyone help. I am an avid fan of accoustats had Model 2's 3's and now I think 2+2. The power unit behind the speaker is MK 2146. It also has "44" on them. I drive them with Steinhart Bolero 350 watt valve amps. I am using these as the fron speakers in a 7 channel suround sound system - front end by Emotiva UMC 200. Issues: Does the "C" mod work with these or is there a mod that can be done - had these for over 25 years? If I wanted use two amps to drive them what do I need to do? (Below 100Hz handled by subs on all 7 channels.) If I get hold of a model three or a 2+2 can I mount this sideways between the left and right accoustats?
Your speaker is the Spectra 44, as indicated by the MK-2146 interface and the 44 stamped on the nameplate. The same interface is used on the larger Spectra 66, but with an internal wiring change to accomodate the larger panel area.

The "C-Modification" applies only to the earlier MK-121 series, and has no application to any of the later Spectra models.

The Spectra series use two identical twin-secondary transformers, one for each phase of the push-pull. Therefore, there is no opportunity for biamping the speakers in the traditional sense. I suppose you could drive each transformer with a seperate amplifier (operating full range) but I'm not sure there would be any advantage to that arrangement.

As mentioned in my earlier response to you, you could use one of the earlier (non-Spectra) models as a center channel, but I suggest you try it first in its normal vertical position before attempting to turn it sideways. A speaker turned sideways may produce a center-channel image that is far too wide, and of course it would also be limited in its vertical dispersion.
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