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Old 4th August 2008, 03:31 PM   #641
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I thought that was the case but one always hopes for improvements. :-)
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Old 4th August 2008, 03:35 PM   #642
gedlee is offline gedlee  United States
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The new technique is certainly an option for the Abbey and its always good to have more options when making design tradeoffs, especially in crossovers.
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Old 4th August 2008, 03:46 PM   #643
MEH is offline MEH  United States
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Quote:
Originally posted by gedlee
The Abbey12 didn't have this same problem so I am not sure that it would have the same effect.
Which problem is that?
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Old 4th August 2008, 03:51 PM   #644
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Dr Geddes:

I see you have changed the high frequency driver to 8 ohms from 16 ohms on your site. Is this part of the new crossover change?

I thought that some time ago you stated that using B&C 15tbx matched with Abbey wave guide would be almost
as good as using the Abbey+ waveguide. I searched but did not find
it. Reason for asking is there is a small difference in price from 12TBX to 15TBX.

What is the optimum height of the wave guide center for seated listening? At ear level? I am wondering about the feasibility of extending bottom of cabinet in lieu of stands. The volume would need adjustment by less depth front to back.

Thank you

SheldonD
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Old 4th August 2008, 03:55 PM   #645
gedlee is offline gedlee  United States
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Quote:
Originally posted by MEH


Which problem is that?
In the older design there was a resonance at 1 kHz which I could not seem to get rid of. This is because both the woofer and the tweeter had resonances there and, well you can see that shifting crossover points did not fix the problem.

The new curves have this peak removed.
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Old 4th August 2008, 03:57 PM   #646
MEH is offline MEH  United States
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Ok, that's what I thought you were referring to, but I just wanted to be certain. Thanks.
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Old 4th August 2008, 04:04 PM   #647
gedlee is offline gedlee  United States
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Quote:
Originally posted by SheldonD
Dr Geddes:

I see you have changed the high frequency driver to 8 ohms from 16 ohms on your site. Is this part of the new crossover change?

I thought that some time ago you stated that using B&C 15tbx matched with Abbey wave guide would be almost
as good as using the Abbey+ waveguide. I searched but did not find
it. Reason for asking is there is a small difference in price from 12TBX to 15TBX.

What is the optimum height of the wave guide center for seated listening? At ear level? I am wondering about the feasibility of extending bottom of cabinet in lieu of stands. The volume would need adjustment by less depth front to back.

Thank you

SheldonD
The new crossover uses an 8 ohm driver.

I think that you misunderstood. An Abbey+ (a 12TBX100 and the 15" waveguide) should be nearly as good as the full Summa in a much smaller and cheaper design. The 15TBX100, is, however, a better woofer as the data clearly shows, so this "almost as good as" is a guess at this point which may not pan out. The full Summa is a known and highly developed system and to get "as good as it is" may not be possible without being what it is.

The center of the speaker should be at ear level. Extending the box down is no problem, even making it bigger is no problem (its a simple closed box and the "Q" of the roll-off is irrelavent if you use multiple subs), other than bigger is more panel resonances and you'll have to be careful with the bigger panels.

You can get the drivers from me you know. I'll bet that I can beat any price that your seeing.
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Old 9th August 2008, 03:07 AM   #648
tomcat9 is offline tomcat9  United States
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Default Crossover

Hi Geddes,
I am still deciding between the Nathan, or Abbey. At this point, I'm thinking it is worth the extra money for the Abbey. I have a question about the crossover. Is this an existing design, or are you working up a new crossover?


Thanks.
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Old 9th August 2008, 04:27 AM   #649
gedlee is offline gedlee  United States
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I will start with the ESP12 crossover and work from there. But since the systems are no identical, I expect some changes.

As far as the Abbey versus the Nathan, bigger size and greater cost are always an advantage. You get what you pay for.
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Old 15th August 2008, 10:46 PM   #650
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Earl,

My waveguides have arrived and they are NOT THE ONES I WANTED AND PAID FOR. If I had wanted the fibreglass ones I would have asked for them.

I paid for and waited nearly two months for the polyurethane ones and now you tell me you do not accept responsibility for this? You have no integrity Earl. Full refund or send me what I paid for not the rubbish I have sitting in my hall. I will NOT be quiet about this. You have screwed up. Fix it up now.
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